Étiquette sous l'image dans UIButton

J'essaie de créer un bouton qui a du texte sous l'icône (un peu comme les boutons de l'application), mais cela semble assez difficile à réaliser. Des idées comment puis-je obtenir le texte à afficher sous l'image avec un UIButton?

Ou vous pouvez simplement utiliser cette catégorie:

ObjC

@interface UIButton (VerticalLayout)

- (void)centerVerticallyWithPadding:(float)padding;
- (void)centerVertically;

@end

@implementation UIButton (VerticalLayout)

- (void)centerVerticallyWithPadding:(float)padding {
    CGSize imageSize = self.imageView.frame.size;
    CGSize titleSize = self.titleLabel.frame.size;
    CGFloat totalHeight = (imageSize.height + titleSize.height + padding);
    
    self.imageEdgeInsets = UIEdgeInsetsMake(- (totalHeight - imageSize.height),
                                            0.0f,
                                            0.0f,
                                            - titleSize.width);
    
    self.titleEdgeInsets = UIEdgeInsetsMake(0.0f,
                                            - imageSize.width,
                                            - (totalHeight - titleSize.height),
                                            0.0f);
    
    self.contentEdgeInsets = UIEdgeInsetsMake(0.0f,
                                              0.0f,
                                              titleSize.height,
                                              0.0f);
}

- (void)centerVertically {
    const CGFloat kDefaultPadding = 6.0f;
    [self centerVerticallyWithPadding:kDefaultPadding];
}

@end

Extension Swift

extension UIButton {
    
    func centerVertically(padding: CGFloat = 6.0) {
        guard
            let imageViewSize = self.imageView?.frame.size,
            let titleLabelSize = self.titleLabel?.frame.size else {
            return
        }
        
        let totalHeight = imageViewSize.height + titleLabelSize.height + padding
        
        self.imageEdgeInsets = UIEdgeInsets(
            top: -(totalHeight - imageViewSize.height),
            left: 0.0,
            bottom: 0.0,
            right: -titleLabelSize.width
        )
        
        self.titleEdgeInsets = UIEdgeInsets(
            top: 0.0,
            left: -imageViewSize.width,
            bottom: -(totalHeight - titleLabelSize.height),
            right: 0.0
        )
        
        self.contentEdgeInsets = UIEdgeInsets(
            top: 0.0,
            left: 0.0,
            bottom: titleLabelSize.height,
            right: 0.0
        )
    }
    
}

Suggestion: si la hauteur du bouton est inférieure à totalHeight, l'image dessinera les bordures extérieures.

imageEdgeInset.top devrait être:

max(0, -(totalHeight - imageViewSize.height))

Dans Xcode, vous pouvez simplement définir l'encart de titre du bord gauche pour négatif la largeur de l'image. Cela affichera l'étiquette au centre de l'image.

Pour que l'étiquette s'affiche sous l'image (un peu comme les boutons de l'application), vous devrez peut-être définir l'encart supérieur du titre Edge sur un nombre positif.

Il s'agit d'un simple bouton de titre centré implémenté dans Swift en remplaçant titleRect(forContentRect:)et imageRect(forContentRect:). Il implémente également intrinsicContentSizepour une utilisation avec AutoLayout.

import UIKit

class CenteredButton: UIButton
{
    override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
        let rect = super.titleRect(forContentRect: contentRect)

        return CGRect(x: 0, y: contentRect.height - rect.height + 5,
            width: contentRect.width, height: rect.height)
    }

    override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
        let rect = super.imageRect(forContentRect: contentRect)
        let titleRect = self.titleRect(forContentRect: contentRect)

        return CGRect(x: contentRect.width/2.0 - rect.width/2.0,
            y: (contentRect.height - titleRect.height)/2.0 - rect.height/2.0,
            width: rect.width, height: rect.height)
    }

    override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize

        if let image = imageView?.image {
            var labelHeight: CGFloat = 0.0

            if let size = titleLabel?.sizeThatFits(CGSize(width: self.contentRect(forBounds: self.bounds).width, height: CGFloat.greatestFiniteMagnitude)) {
                labelHeight = size.height
            }

            return CGSize(width: size.width, height: image.size.height + labelHeight + 5)
        }

        return size
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        centerTitleLabel()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        centerTitleLabel()
    }

    private func centerTitleLabel() {
        self.titleLabel?.textAlignment = .center
    }
}

Regardez cette excellente réponse dans Swift.

extension UIButton {

    func alignImageAndTitleVertically(padding: CGFloat = 6.0) {
        let imageSize = self.imageView!.frame.size
        let titleSize = self.titleLabel!.frame.size
        let totalHeight = imageSize.height + titleSize.height + padding

        self.imageEdgeInsets = UIEdgeInsets(
            top: -(totalHeight - imageSize.height),
            left: 0,
            bottom: 0,
            right: -titleSize.width
        )

        self.titleEdgeInsets = UIEdgeInsets(
            top: 0,
            left: -imageSize.width,
            bottom: -(totalHeight - titleSize.height),
            right: 0
        )
    }

}

Sous-classe UIButton. Override - layoutSubviewspour déplacer le intégré subviewsdans de nouvelles positions:

- (void)layoutSubviews
{
    [super layoutSubviews];

    CGRect frame = self.imageView.frame;
    frame = CGRectMake(truncf((self.bounds.size.width - frame.size.width) / 2), 0.0f, frame.size.width, frame.size.height);
    self.imageView.frame = frame;

    frame = self.titleLabel.frame;
    frame = CGRectMake(truncf((self.bounds.size.width - frame.size.width) / 2), self.bounds.size.height - frame.size.height, frame.size.width, frame.size.height);
    self.titleLabel.frame = frame;
}

Réponse de icecrystal23 refactorisée.

Swift 3, fonctionne avec les mises en page automatiques, xib, les storyboards, peut être animé.

Le bouton dans la réponse originale de icecrystal23 avait un cadre mal calculé. Je pense que j'ai réglé ça.

Edit: mis à jour vers Swift 5 et fait fonctionner dans Interface Builder / Storyboards

import UIKit

@IBDesignable
class VerticalButton: UIButton {

    @IBInspectable public var padding: CGFloat = 20.0 {
        didSet {
            setNeedsLayout()
        }
    }

    override var intrinsicContentSize: CGSize {
        let maxSize = CGSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude)

        if let titleSize = titleLabel?.sizeThatFits(maxSize), let imageSize = imageView?.sizeThatFits(maxSize) {
            let width = ceil(max(imageSize.width, titleSize.width))
            let height = ceil(imageSize.height + titleSize.height + padding)

            return CGSize(width: width, height: height)
        }

        return super.intrinsicContentSize
    }

    override func layoutSubviews() {
        if let image = imageView?.image, let title = titleLabel?.attributedText {
            let imageSize = image.size
            let titleSize = title.size()

            titleEdgeInsets = UIEdgeInsets(top: 0.0, left: -imageSize.width, bottom: -(imageSize.height + padding), right: 0.0)
            imageEdgeInsets = UIEdgeInsets(top: -(titleSize.height + padding), left: 0.0, bottom: 0.0, right: -titleSize.width)
        }

        super.layoutSubviews()
    }

}

corrigé une des réponses ici:

Swift 3:

class CenteredButton: UIButton
{
    override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
        let rect = super.titleRect(forContentRect: contentRect)
        let imageRect = super.imageRect(forContentRect: contentRect)

        return CGRect(x: 0, y: imageRect.maxY + 10,
                      width: contentRect.width, height: rect.height)
    }

    override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
        let rect = super.imageRect(forContentRect: contentRect)
        let titleRect = self.titleRect(forContentRect: contentRect)

        return CGRect(x: contentRect.width/2.0 - rect.width/2.0,
                      y: (contentRect.height - titleRect.height)/2.0 - rect.height/2.0,
                      width: rect.width, height: rect.height)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        centerTitleLabel()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        centerTitleLabel()
    }

    private func centerTitleLabel() {
        self.titleLabel?.textAlignment = .center
    }
}

Ceci est une version modifiée de l'excellente réponse d'Erik W. Mais au lieu de placer l'image centrée en HAUT de la vue, il place l'image et l'étiquette centrées dans la vue en tant que groupe.

La différence est:

+-----------+
|    ( )    |
|   Hello   |     // Erik W's code
|           |
|           |
+-----------+

contre

+-----------+
|           |
|    ( )    |     // My modified version
|   Hello   |
|           |
+-----------+

Source ci-dessous:

-(void)layoutSubviews {
    [super layoutSubviews];

    CGRect titleLabelFrame = self.titleLabel.frame;
    CGSize labelSize = [self.titleLabel.text sizeWithFont:self.titleLabel.font constrainedToSize:CGSizeMake(self.frame.size.width, CGFLOAT_MAX) lineBreakMode:NSLineBreakByWordWrapping];

    CGRect imageFrame = self.imageView.frame;

    CGSize fitBoxSize = (CGSize){.height = labelSize.height + kTextTopPadding +  imageFrame.size.height, .width = MAX(imageFrame.size.width, labelSize.width)};

    CGRect fitBoxRect = CGRectInset(self.bounds, (self.bounds.size.width - fitBoxSize.width)/2, (self.bounds.size.height - fitBoxSize.height)/2);

    imageFrame.origin.y = fitBoxRect.origin.y;
    imageFrame.origin.x = CGRectGetMidX(fitBoxRect) - (imageFrame.size.width/2);
    self.imageView.frame = imageFrame;

    // Adjust the label size to fit the text, and move it below the image

    titleLabelFrame.size.width = labelSize.width;
    titleLabelFrame.size.height = labelSize.height;
    titleLabelFrame.origin.x = (self.frame.size.width / 2) - (labelSize.width / 2);
    titleLabelFrame.origin.y = fitBoxRect.origin.y + imageFrame.size.height + kTextTopPadding;
    self.titleLabel.frame = titleLabelFrame;
}

FYI: Cela peut casser lorsqu'il est combiné avec des animations UIView, car layoutSubviews est appelé pendant celles-ci.

La solution de Dave dans Swift:

override func layoutSubviews() {
    super.layoutSubviews()
    if let imageView = self.imageView {
        imageView.frame.origin.x = (self.bounds.size.width - imageView.frame.size.width) / 2.0
        imageView.frame.origin.y = 0.0
    }
    if let titleLabel = self.titleLabel {
        titleLabel.frame.origin.x = (self.bounds.size.width - titleLabel.frame.size.width) / 2.0
        titleLabel.frame.origin.y = self.bounds.size.height - titleLabel.frame.size.height
    }
}

Si vous sous UIButton- classez et override layoutSubviews, vous pouvez utiliser ce qui suit pour centrer l'image et placer le titre centré en dessous:

kTextTopPadding est une constante que vous devrez introduire qui détermine l'espace entre l'image et le texte en dessous.

-(void)layoutSubviews {
    [super layoutSubviews];

    // Move the image to the top and center it horizontally
    CGRect imageFrame = self.imageView.frame;
    imageFrame.origin.y = 0;
    imageFrame.origin.x = (self.frame.size.width / 2) - (imageFrame.size.width / 2);
    self.imageView.frame = imageFrame;

    // Adjust the label size to fit the text, and move it below the image
    CGRect titleLabelFrame = self.titleLabel.frame;
    CGSize labelSize = [self.titleLabel.text sizeWithFont:self.titleLabel.font
                                        constrainedToSize:CGSizeMake(self.frame.size.width, CGFLOAT_MAX)
                                        lineBreakMode:NSLineBreakByWordWrapping];
    titleLabelFrame.size.width = labelSize.width;
    titleLabelFrame.size.height = labelSize.height;
    titleLabelFrame.origin.x = (self.frame.size.width / 2) - (labelSize.width / 2);
    titleLabelFrame.origin.y = self.imageView.frame.origin.y + self.imageView.frame.size.height + kTextTopPadding;
    self.titleLabel.frame = titleLabelFrame;

}

Mise à jour de la réponse de Kenny Winker depuis que sizeWithFont est obsolète dans iOS 7.

-(void)layoutSubviews {
[super layoutSubviews];

int kTextTopPadding = 3;

CGRect titleLabelFrame = self.titleLabel.frame;

CGRect labelSize = [self.titleLabel.text boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, CGRectGetHeight(self.bounds)) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.titleLabel.font} context:nil];

CGRect imageFrame = self.imageView.frame;

CGSize fitBoxSize = (CGSize){.height = labelSize.size.height + kTextTopPadding +  imageFrame.size.height, .width = MAX(imageFrame.size.width, labelSize.size.width)};

CGRect fitBoxRect = CGRectInset(self.bounds, (self.bounds.size.width - fitBoxSize.width)/2, (self.bounds.size.height - fitBoxSize.height)/2);

imageFrame.origin.y = fitBoxRect.origin.y;
imageFrame.origin.x = CGRectGetMidX(fitBoxRect) - (imageFrame.size.width/2);
self.imageView.frame = imageFrame;

// Adjust the label size to fit the text, and move it below the image

titleLabelFrame.size.width = labelSize.size.width;
titleLabelFrame.size.height = labelSize.size.height;
titleLabelFrame.origin.x = (self.frame.size.width / 2) - (labelSize.size.width / 2);
titleLabelFrame.origin.y = fitBoxRect.origin.y + imageFrame.size.height + kTextTopPadding;
self.titleLabel.frame = titleLabelFrame;
}

Sur iOS 11 / Swift 4, aucune des réponses ci-dessus n'a vraiment fonctionné pour moi. J'ai trouvé quelques exemples et j'ai mis mon tour dessus:

extension UIButton {

    func centerImageAndButton(_ gap: CGFloat, imageOnTop: Bool) {

      guard let imageView = self.currentImage,
      let titleLabel = self.titleLabel?.text else { return }

      let sign: CGFloat = imageOnTop ? 1 : -1
      self.titleEdgeInsets = UIEdgeInsetsMake((imageView.size.height + gap) * sign, -imageView.size.width, 0, 0);

      let titleSize = titleLabel.size(withAttributes:[NSAttributedStringKey.font: self.titleLabel!.font!])
      self.imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + gap) * sign, 0, 0, -titleSize.width)
    }
}

J'espère que cela aide quelqu'un.

En utilisant le code de Kenny Winker et Simeon, je crée ce code rapide qui fonctionne pour moi.

import UIKit

@IBDesignable
class TopIconButton: UIButton {
    override func layoutSubviews() {
        super.layoutSubviews()

        let kTextTopPadding:CGFloat = 3.0;

        var titleLabelFrame = self.titleLabel!.frame;


        let labelSize = titleLabel!.sizeThatFits(CGSizeMake(CGRectGetWidth(self.contentRectForBounds(self.bounds)), CGFloat.max))

        var imageFrame = self.imageView!.frame;

        let fitBoxSize = CGSizeMake(max(imageFrame.size.width, labelSize.width), labelSize.height + kTextTopPadding + imageFrame.size.    height)

        let fitBoxRect = CGRectInset(self.bounds, (self.bounds.size.width - fitBoxSize.width)/2, (self.bounds.size.height - fitBoxSize.    height)/2);

        imageFrame.origin.y = fitBoxRect.origin.y;
        imageFrame.origin.x = CGRectGetMidX(fitBoxRect) - (imageFrame.size.width/2);
        self.imageView!.frame = imageFrame;

        // Adjust the label size to fit the text, and move it below the image

        titleLabelFrame.size.width = labelSize.width;
        titleLabelFrame.size.height = labelSize.height;
        titleLabelFrame.origin.x = (self.frame.size.width / 2) - (labelSize.width / 2);
        titleLabelFrame.origin.y = fitBoxRect.origin.y + imageFrame.size.height + kTextTopPadding;
        self.titleLabel!.frame = titleLabelFrame;
        self.titleLabel!.textAlignment = .Center
    }

}

Il vous suffit d'ajuster les trois encarts de bord en fonction de la taille de votre image et de l'étiquette de titre:

button.contentEdgeInsets = UIEdgeInsetsMake(0, 0, titleLabelBounds.height + 4, 0)
button.titleEdgeInsets = UIEdgeInsetsMake(image.size.height + 8, -image.size.width, 0, 0)
button.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -titleLabelBounds.width)

Vous pouvez obtenir les limites de l'étiquette de titre en appelant sizeToFit après avoir défini son texte. L'espacement horizontal devrait fonctionner quelle que soit la taille du texte, de la police et de l'image, mais je ne connais pas de solution unique pour obtenir la cohérence de l'espacement vertical et du bord inférieur du contenu.

Voici la réponse de "Bear With Me" en tant que sous-classe dans Swift 2.0. Pour l' utiliser il suffit de changer votre classe de bouton Interface Builderpour VerticalButtonet comme par magie à jour l'aperçu.

Je l'ai également mis à jour pour calculer la taille de contenu intrinsèque correcte pour la mise en page automatique.

import UIKit

@IBDesignable

class VerticalButton: UIButton {
    @IBInspectable var padding: CGFloat = 8

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()

        update()
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        update()
    }

    func update() {
        let imageBounds = self.imageView!.bounds
        let titleBounds = self.titleLabel!.bounds
        let totalHeight = CGRectGetHeight(imageBounds) + padding + CGRectGetHeight(titleBounds)

        self.imageEdgeInsets = UIEdgeInsets(
            top: -(totalHeight - CGRectGetHeight(imageBounds)),
            left: 0,
            bottom: 0,
            right: -CGRectGetWidth(titleBounds)
        )

        self.titleEdgeInsets = UIEdgeInsets(
            top: 0,
            left: -CGRectGetWidth(imageBounds),
            bottom: -(totalHeight - CGRectGetHeight(titleBounds)),
            right: 0
        )
    }

    override func intrinsicContentSize() -> CGSize {
        let imageBounds = self.imageView!.bounds
        let titleBounds = self.titleLabel!.bounds

        let width = CGRectGetWidth(imageBounds) > CGRectGetWidth(titleBounds) ? CGRectGetWidth(imageBounds) : CGRectGetWidth(titleBounds)
        let height = CGRectGetHeight(imageBounds) + padding + CGRectGetHeight(titleBounds)

        return CGSizeMake(width, height)
    }
}

@Tiago je change ta réponse comme ça. Cela fonctionne bien avec toutes les tailles

func alignImageAndTitleVertically(padding: CGFloat = 5.0) {
        self.sizeToFit()
        let imageSize = self.imageView!.frame.size
        let titleSize = self.titleLabel!.frame.size
        let totalHeight = imageSize.height + titleSize.height + padding

        self.imageEdgeInsets = UIEdgeInsets(
            top: -(totalHeight - imageSize.height),
            left: 0,
            bottom: 0,
            right: -titleSize.width
        )

        self.titleEdgeInsets = UIEdgeInsets(
            top: 0,
            left: 0,
            bottom: -(totalHeight - titleSize.height),
            right: titleSize.height
        )
    }

J'ai pris une combinaison des réponses ici et en ai trouvé une qui semble fonctionner pour moi, à Swift. Je n'aime pas la façon dont je viens de remplacer les inserts, mais cela fonctionne. Je serais ouvert aux améliorations suggérées dans les commentaires. Il semble fonctionner correctement avec sizeToFit()et avec la mise en page automatique.

import UIKit

/// A button that displays an image centered above the title.  This implementation 
/// only works when both an image and title are set, and ignores
/// any changes you make to edge insets.
class CenteredButton: UIButton
{
    let padding: CGFloat = 0.0

    override func layoutSubviews() {
        if imageView?.image != nil && titleLabel?.text != nil {
            let imageSize: CGSize = imageView!.image!.size
            titleEdgeInsets = UIEdgeInsetsMake(0.0, -imageSize.width, -(imageSize.height + padding), 0.0)
            let labelString = NSString(string: titleLabel!.text!)
            let titleSize = labelString.sizeWithAttributes([NSFontAttributeName: titleLabel!.font])
            imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + padding), 0.0, 0.0, -titleSize.width)
            let edgeOffset = abs(titleSize.height - imageSize.height) / 2.0;
            contentEdgeInsets = UIEdgeInsetsMake(edgeOffset, 0.0, edgeOffset, 0.0)
        }
        super.layoutSubviews()
    }

    override func sizeThatFits(size: CGSize) -> CGSize {
        let defaultSize = super.sizeThatFits(size)
        if let titleSize = titleLabel?.sizeThatFits(size),
        let imageSize = imageView?.sizeThatFits(size) {
            return CGSize(width: ceil(max(imageSize.width, titleSize.width)), height: ceil(imageSize.height + titleSize.height + padding))
        }
        return defaultSize
    }

    override func intrinsicContentSize() -> CGSize {
        let size = sizeThatFits(CGSize(width: CGFloat.max, height: CGFloat.max))
        return size
    }
}

Utilisez ces deux méthodes:

func titleRect(forContentRect contentRect: CGRect) -> CGRect
func imageRect(forContentRect contentRect: CGRect) -> CGRect

Exemple:

class VerticalButton: UIButton {

  override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
    let titleRect = super.titleRect(forContentRect: contentRect)
    let imageRect = super.imageRect(forContentRect: contentRect)

    return CGRect(x: 0,
                  y: contentRect.height - (contentRect.height - padding - imageRect.size.height - titleRect.size.height) / 2 - titleRect.size.height,
                  width: contentRect.width,
                  height: titleRect.height)
  }

  override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
    let imageRect = super.imageRect(forContentRect: contentRect)
    let titleRect = self.titleRect(forContentRect: contentRect)

    return CGRect(x: contentRect.width/2.0 - imageRect.width/2.0,
                  y: (contentRect.height - padding - imageRect.size.height - titleRect.size.height) / 2,
                  width: imageRect.width,
                  height: imageRect.height)
  }

  private let padding: CGFloat
  init(padding: CGFloat) {
    self.padding = padding

    super.init(frame: .zero)
    self.titleLabel?.textAlignment = .center
  }

  required init?(coder aDecoder: NSCoder) { fatalError() }
}

extension UIButton {

  static func vertical(padding: CGFloat) -> UIButton {
    return VerticalButton(padding: padding)
  }
}

Et vous pouvez utiliser:

let myButton = UIButton.vertical(padding: 6)

Swift 5 - la méthode ci-dessous fonctionne pour moi

func centerVerticallyWithPadding(padding : CGFloat) {
        guard
            let imageViewSize = self.imageView?.frame.size,
            let titleLabelSize = self.titleLabel?.frame.size else {
            return
        }

        let totalHeight = imageViewSize.height + titleLabelSize.height + padding

        self.imageEdgeInsets = UIEdgeInsets(
            top: max(0, -(totalHeight - imageViewSize.height)),
            left: 0.0,
            bottom: 0.0,
            right: -titleLabelSize.width
        )

        self.titleEdgeInsets = UIEdgeInsets(
            top: (totalHeight - imageViewSize.height),
            left: -imageViewSize.width,
            bottom: -(totalHeight - titleLabelSize.height),
            right: 0.0
        )

        self.contentEdgeInsets = UIEdgeInsets(
            top: 0.0,
            left: 0.0,
            bottom: titleLabelSize.height,
            right: 0.0
        )
    }

Assurez-vous que le titre de votre bouton n'est pas tronqué dans le storyboard / xib sinon passez à la
solution 2

class SVVerticalButton: UIButton {

    override func layoutSubviews() {
        super.layoutSubviews()
        let padding : CGFloat = 2.0
        if let imageView = self.imageView {
            imageView.frame.origin.x = (self.bounds.size.width - imageView.frame.size.width) / 2.0
            imageView.frame.origin.y = max(0,(self.bounds.size.height - (imageView.frame.size.height + (titleLabel?.frame.size.height ?? 0.0) + padding)) / 2.0)
        }
        if let titleLabel = self.titleLabel {
            titleLabel.frame.origin.x = 0
            titleLabel.frame.origin.y = self.bounds.size.height - titleLabel.frame.size.height
            titleLabel.frame.size.width = self.bounds.size.width
            titleLabel.textAlignment = .center
        }
    }

}

Je pense que l'un des meilleurs moyens de le faire est de sous-classer UIButton et de remplacer certaines méthodes de rendu:

- (void)awakeFromNib
{
    [super awakeFromNib];
    [self setupSubViews];
}

- (instancetype)init
{
    if (self = [super init])
    {
        [self setupSubViews];
    }
    return self;
}

- (void)setupSubViews
{
    [self.imageView setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self addConstraint:[NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.imageView attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];
    [self.titleLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[imageView][titleLabel]|" options:NSLayoutFormatAlignAllCenterX metrics:nil views:@{@"imageView": self.imageView, @"titleLabel": self.titleLabel}]];
}

- (CGSize)intrinsicContentSize
{
    CGSize imageSize = self.imageView.image.size;
    CGSize titleSize = [self.titleLabel.text sizeWithAttributes:@{NSFontAttributeName: self.titleLabel.font}];
    return CGSizeMake(MAX(imageSize.width, titleSize.width), imageSize.height + titleSize.height);
}

J'ai trouvé que la réponse de Simeon était probablement la meilleure, mais cela me donnait des résultats étranges sur certains boutons et je ne pouvais tout simplement pas comprendre pourquoi. Donc, en utilisant sa réponse comme base, j'ai implémenté mes boutons comme ci-dessous:

#define PADDING 2.0f

@implementation OOButtonVerticalImageText

-(CGSize) intrinsicContentSize {
  CGSize size = [super intrinsicContentSize];
  CGFloat labelHeight = 0.0f;
  CGSize titleSize = [self.titleLabel sizeThatFits:CGSizeMake([self contentRectForBounds:self.bounds].size.width, CGFLOAT_MAX)];
  labelHeight = titleSize.height;
  return CGSizeMake(MAX(titleSize.width, self.imageView.image.size.width), self.imageView.image.size.height + labelHeight + PADDING);
}

-(void) layoutSubviews {
  [super layoutSubviews];

  CGSize titleSize = [self.titleLabel sizeThatFits:CGSizeMake([self contentRectForBounds:self.bounds].size.width, CGFLOAT_MAX)];
  self.titleLabel.frame = CGRectMake((self.bounds.size.width - titleSize.width)/2.0f,
                                     self.bounds.size.height - titleSize.height - PADDING,
                                     titleSize.width,
                                     titleSize.height);

  CGSize ivSize = self.imageView.frame.size;
  self.imageView.frame = CGRectMake((self.bounds.size.width - ivSize.width)/2.0f,
                                    self.titleLabel.frame.origin.y - ivSize.height - PADDING,
                                    ivSize.width,
                                    ivSize.height);
}

@end

Voici ma sous-classe UIButtonqui résout ce problème:

@implementation MyVerticalButton

@synthesize titleAtBottom; // BOOL property

- (id)initWithFrame:(CGRect)frame
{
  self = [super initWithFrame:frame];
  if (self) {
    self.titleAtBottom = YES;
  }
  return self;
}

- (CGSize)sizeThatFits:(CGSize)size {
  self.titleLabel.text = [self titleForState: self.state];

  UIEdgeInsets imageInsets = self.imageEdgeInsets;
  UIEdgeInsets titleInsets = self.titleEdgeInsets;

  CGSize imageSize = [self imageForState: self.state].size;
  if (!CGSizeEqualToSize(imageSize, CGSizeZero)) {
    imageSize.width += imageInsets.left + imageInsets.right;
    imageSize.height += imageInsets.top + imageInsets.bottom;

  }

  CGSize textSize = [self.titleLabel sizeThatFits: CGSizeMake(size.width - titleInsets.left - titleInsets.right,
                                                              size.height -(imageSize.width +
                                                                            titleInsets.top+titleInsets.bottom))];
  if (!CGSizeEqualToSize(textSize, CGSizeZero)) {
    textSize.width += titleInsets.left + titleInsets.right;
    textSize.height += titleInsets.top + titleInsets.bottom;
  }

  CGSize result = CGSizeMake(MAX(textSize.width, imageSize.width),
                             textSize.height + imageSize.height);
  return result;
}

- (void)layoutSubviews {
  // needed to update all properities of child views:
  [super layoutSubviews];

  CGRect bounds = self.bounds;

  CGRect titleFrame = UIEdgeInsetsInsetRect(bounds, self.titleEdgeInsets);
  CGRect imageFrame = UIEdgeInsetsInsetRect(bounds, self.imageEdgeInsets);
  if (self.titleAtBottom) {
    CGFloat titleHeight = [self.titleLabel sizeThatFits: titleFrame.size].height;
    titleFrame.origin.y = CGRectGetMaxY(titleFrame)-titleHeight;
    titleFrame.size.height = titleHeight;
    titleFrame = CGRectStandardize(titleFrame);
    self.titleLabel.frame = titleFrame;

    CGFloat imageBottom = CGRectGetMinY(titleFrame)-(self.titleEdgeInsets.top+self.imageEdgeInsets.bottom);
    imageFrame.size.height = imageBottom - CGRectGetMinY(imageFrame);
    self.imageView.frame = CGRectStandardize(imageFrame);
  } else {
    CGFloat titleHeight = [self.titleLabel sizeThatFits: titleFrame.size].height;
    titleFrame.size.height = titleHeight;
    titleFrame = CGRectStandardize(titleFrame);
    self.titleLabel.frame = titleFrame;

    CGFloat imageTop = CGRectGetMaxY(titleFrame)+(self.titleEdgeInsets.bottom+self.imageEdgeInsets.top);
    imageFrame.size.height = CGRectGetMaxY(imageFrame) - imageTop;
    self.imageView.frame = CGRectStandardize(imageFrame);
  }
}

- (void)setTitleAtBottom:(BOOL)newTitleAtBottom {
  if (titleAtBottom!=newTitleAtBottom) {
    titleAtBottom=newTitleAtBottom;
    [self setNeedsLayout];
  }
}

@end

C'est tout. Fonctionne comme du charme. Un problème peut survenir si le bouton est trop petit pour s'adapter au titre et au texte.

@ Syméon solution en Objective-C

#import "CenteredButton.h"

@implementation CenteredButton

- (CGRect)titleRectForContentRect:(CGRect)contentRect
{
    CGRect rect = [super titleRectForContentRect: contentRect];
    return CGRectMake(0,
                      contentRect.size.height - rect.size.height - 5,
                      contentRect.size.width,
                      rect.size.height);
}

- (CGRect)imageRectForContentRect:(CGRect)contentRect
{
    CGRect rect = [super imageRectForContentRect: contentRect];
    CGRect titleRect = [self titleRectForContentRect: contentRect];

    return CGRectMake(contentRect.size.width / 2.0 - rect.size.width / 2.0,
                      (contentRect.size.height - titleRect.size.height)/2.0 - rect.size.height/2.0,
                      rect.size.width,
                      rect.size.height);
}

- (CGSize)intrinsicContentSize {
    CGSize imageSize = [super intrinsicContentSize];

    if (self.imageView.image) {
        UIImage* image = self.imageView.image;
        CGFloat labelHeight = 0.0;

        CGSize labelSize = [self.titleLabel sizeThatFits: CGSizeMake([self contentRectForBounds: self.bounds].size.width, CGFLOAT_MAX)];
        if (CGSizeEqualToSize(imageSize, labelSize)) {
            labelHeight = imageSize.height;
        }

        return CGSizeMake(MAX(labelSize.width, imageSize.width), image.size.height + labelHeight + 5);
    }

    return imageSize;
}

- (id) initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
     if (self) {
         [self centerTitleLabel];
     }
    return self;

}

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self centerTitleLabel];
    }
    return self;
}

- (void)centerTitleLabel {
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
}

@end

Si vous utilisez des polices personnalisées, le calcul de la taille de titleLabel ne fonctionnera pas correctement, vous devez le remplacer par

let titleLabelSize = self.titleLabel?.text?.size(withAttributes: [NSAttributedStringKey.font: self.titleLabel!.font!])

Au lieu de traverser l'enfer en essayant de positionner l'icône et le texte avec des inserts de bord, vous pouvez créer un NSAttributedString avec votre image en tant que pièce jointe et le définir à la place sur le titre attribué à votre bouton:

let titleText = NSAttributedString(string: yourTitle, attributes: attributes)
let imageAttachment = NSTextAttachment()
imageAttachment.image = yourImage

let title = NSMutableAttributedString(string: "")
title.append(NSAttributedString(attachment: imageAttachment))
title.append(titleText)

button.setAttributedTitle(title, for: .normal)

Solution conviviale pour la localisation:

Tant de bonnes solutions, mais j'aimerais ajouter une note ici pour ceux qui utilisent la localisation.

Vous devez inverser les valeurs EdgeInstets gauche et droite pour que le bouton soit correctement disposé en cas de changement de direction de la langue de LtR à RtL.

En utilisant une solution similaire, je l'implémenterais comme suit:

extension UIButton {

    func alignVertical(spacing: CGFloat, lang: String) {
        guard let imageSize = self.imageView?.image?.size,
            let text = self.titleLabel?.text,
            let font = self.titleLabel?.font
        else { return }

        let labelString = NSString(string: text)
        let titleSize = labelString.size(
            withAttributes: [NSAttributedString.Key.font: font]
        )

        var titleLeftInset: CGFloat = -imageSize.width
        var titleRigtInset: CGFloat = 0.0

        var imageLeftInset: CGFloat = 0.0
        var imageRightInset: CGFloat = -titleSize.width

        if Locale.current.languageCode! != "en" { // If not Left to Right language
            titleLeftInset = 0.0
            titleRigtInset = -imageSize.width

            imageLeftInset = -titleSize.width
            imageRightInset = 0.0
        }

        self.titleEdgeInsets = UIEdgeInsets(
            top: 0.0,
            left: titleLeftInset,
            bottom: -(imageSize.height + spacing),
            right: titleRigtInset
        )
        self.imageEdgeInsets = UIEdgeInsets(
            top: -(titleSize.height + spacing),
            left: imageLeftInset,
            bottom: 0.0,
            right: imageRightInset
        )
        let edgeOffset = abs(titleSize.height - imageSize.height) / 2.0;
        self.contentEdgeInsets = UIEdgeInsets(
            top: edgeOffset,
            left: 0.0,
            bottom: edgeOffset,
            right: 0.0
        )
    }
}

Image du haut et bouton de titre du bas avec UIButton de sous-classification

class VerticalButton: UIButton {
  override func layoutSubviews() {
    super.layoutSubviews()
    let padding: CGFloat = 8
    let iH = imageView?.frame.height ?? 0
    let tH = titleLabel?.frame.height ?? 0
    let v: CGFloat = (frame.height - iH - tH - padding) / 2
    if let iv = imageView {
      let x = (frame.width - iv.frame.width) / 2
      iv.frame.origin.y = v
      iv.frame.origin.x = x
    }

    if let tl = titleLabel {
      let x = (frame.width - tl.frame.width) / 2
      tl.frame.origin.y = frame.height - tl.frame.height - v
      tl.frame.origin.x = x
    }
  }
}

C'est définitivement exagéré pour cette question, cependant ... Dans l'un de mes projets, j'ai d'abord dû implémenter un bouton avec l'icône alignée le plus à gauche. Ensuite, nous avons un autre bouton avec le titre sous l'image. J'ai cherché une solution existante mais sans chance Alors, voici le bouton alignable:

@IBDesignable
class AlignableButton: UIButton {

override class var requiresConstraintBasedLayout: Bool {
    return true
}

@objc enum IconAlignment: Int {
    case top, left, right, bottom
}

// MARK: - Designables
@IBInspectable var iconAlignmentValue: Int {
    set {
        iconAlignment = IconAlignment(rawValue: newValue) ?? .left
    }
    get {
        return iconAlignment.rawValue
    }
}

var iconAlignment: IconAlignment = .left

@IBInspectable var titleAlignmentValue: Int {
    set {
        titleAlignment = NSTextAlignment(rawValue: newValue) ?? .left
    }
    get {
        return titleAlignment.rawValue
    }
}

var titleAlignment: NSTextAlignment = .left

// MARK: - Corner Radius
@IBInspectable
var cornerRadius: CGFloat {
    get {
        return layer.cornerRadius
    }
    set {
        layer.masksToBounds = (newValue != 0)
        layer.cornerRadius = newValue
    }
}

// MARK: - Content size
override var intrinsicContentSize: CGSize {
    
    switch iconAlignment {
    case .top, .bottom:
        return verticalAlignedIntrinsicContentSize
    
    default:
        return super.intrinsicContentSize
    }
}

private var verticalAlignedIntrinsicContentSize: CGSize {
    
    if let imageSize = imageView?.intrinsicContentSize,
        let labelSize = titleLabel?.intrinsicContentSize {
        
        let width = max(imageSize.width, labelSize.width) + contentEdgeInsets.left + contentEdgeInsets.right
        let height = imageSize.height + labelSize.height + contentEdgeInsets.top + contentEdgeInsets.bottom
        
        return CGSize(
            width: ceil(width),
            height: ceil(height)
        )
    }
    
    return super.intrinsicContentSize
}

// MARK: - Image Rect
override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
    
    switch iconAlignment {
    case .top:
        return topAlignedImageRect(forContentRect: contentRect)
    case .bottom:
        return bottomAlignedImageRect(forContentRect: contentRect)
    case .left:
        return leftAlignedImageRect(forContentRect: contentRect)
    case .right:
        return rightAlignedImageRect(forContentRect: contentRect)
    }
}

func topAlignedImageRect(forContentRect contentRect: CGRect) -> CGRect {
    let rect = super.imageRect(forContentRect: contentRect)
    
    let x = (contentRect.width - rect.width) / 2.0 + contentRect.minX
    let y = contentRect.minY
    let w = rect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: imageEdgeInsets)
}

func bottomAlignedImageRect(forContentRect contentRect: CGRect) -> CGRect {
    let rect = super.imageRect(forContentRect: contentRect)
    
    let x = (contentRect.width - rect.width) / 2.0 + contentRect.minX
    let y = contentRect.height - rect.height + contentRect.minY
    let w = rect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: imageEdgeInsets)
}

func leftAlignedImageRect(forContentRect contentRect: CGRect) -> CGRect {
    let rect = super.imageRect(forContentRect: contentRect)
    
    let x = contentRect.minX
    let y = (contentRect.height - rect.height) / 2 + contentRect.minY
    let w = rect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: imageEdgeInsets)
}

func rightAlignedImageRect(forContentRect contentRect: CGRect) -> CGRect {
    let rect = super.imageRect(forContentRect: contentRect)
    
    let x = (contentRect.width - rect.width) + contentRect.minX
    let y = (contentRect.height - rect.height) / 2 + contentRect.minY
    let w = rect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: imageEdgeInsets)
}

// MARK: - Title Rect
override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    switch iconAlignment {
    case .top:
        return topAlignedTitleRect(forContentRect: contentRect)
    case .bottom:
        return bottomAlignedTitleRect(forContentRect: contentRect)
    case .left:
        return leftAlignedTitleRect(forContentRect: contentRect)
    case .right:
        return rightAlignedTitleRect(forContentRect: contentRect)
    }
}

func topAlignedTitleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    let rect = super.titleRect(forContentRect: contentRect)

    let x = contentRect.minX
    let y = contentRect.height - rect.height + contentRect.minY
    let w = contentRect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: titleEdgeInsets)
}

func bottomAlignedTitleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    let rect = super.titleRect(forContentRect: contentRect)
    
    let x = contentRect.minX
    let y = contentRect.minY
    let w = contentRect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: titleEdgeInsets)
}

func leftAlignedTitleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    let titleRect = super.titleRect(forContentRect: contentRect)
    let imageRect = self.imageRect(forContentRect: contentRect)
    
    let x = imageRect.width + imageRect.minX
    let y = (contentRect.height - titleRect.height) / 2.0 + contentRect.minY
    let w = contentRect.width - imageRect.width * 2.0
    let h = titleRect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: titleEdgeInsets)
}

func rightAlignedTitleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    let titleRect = super.titleRect(forContentRect: contentRect)
    let imageRect = self.imageRect(forContentRect: contentRect)

    let x = contentRect.minX + imageRect.width
    let y = (contentRect.height - titleRect.height) / 2.0 + contentRect.minY
    let w = contentRect.width - imageRect.width * 2.0
    let h = titleRect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: titleEdgeInsets)
}

// MARK: - Lifecycle
override func awakeFromNib() {
    super.awakeFromNib()
    
    titleLabel?.textAlignment = titleAlignment
}

override func prepareForInterfaceBuilder() {
    super.prepareForInterfaceBuilder()
    
    titleLabel?.textAlignment = titleAlignment
}
}