UIButton中的图像下的标签

Question

我正在尝试创建一个按钮,在图标下面有一些文字(有点像app按钮)但是它似乎很难实现.任何想法我怎样才能让文字显示在图像下方UIButton？

Answer 1

或者你可以使用这个类别:

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

迅捷扩展

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
        )
    }

}

Answer 2

在Xcode中,您只需将Edge Title Left Inset设置为负图像宽度即可.这将在图像的中心显示标签.

要使标签显示在图像下方(按应用按钮排序),您可能需要将Edge Title Top Inset设置为某个正数.

Answer 3

这是一个简单的居中标题按钮,通过覆盖titleRect(forContentRect:)和在Swift中实现imageRect(forContentRect:).它还实现intrinsicContentSize了与AutoLayout一起使用.

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
    }
}

Answer 4

看看Swift 中的这个好答案.

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
        )
    }

}

Answer 5

子类UIButton.覆盖 - layoutSubviews将内置移动subviews到新位置:

- (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;
}

Answer 6

纠正了其中一个答案:

斯威夫特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
    }
}

Answer 7

重构icecrystal23的答案.

Swift 3,适用于自动布局,xib,故事板,可以动画.

原始icecrystal23的答案中的按钮有一个严重计算的框架.我想我已经修好了.

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()
    }

}

Answer 8

如果你继承UIButton和override layoutSubviews,你可以用下面的居中图像和居中放置在它下面的标题:

kTextTopPadding 是你必须引入的一个常量,它决定了图像和它下面文本之间的空间.

-(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;

}

Answer 9

这是Erik W优秀答案的修改版本.但是,不是将图像放在视图的顶部,而是将图像和标签作为一组放在视图中心.

不同之处是:

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

VS

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

来源如下:

-(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;
}

仅供参考:当与UIView动画结合使用时,这可能会中断,因为在它们期间会调用layoutSubviews.

Answer 10

戴夫在Swift中的解决方案:

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
    }
}

Answer 11

更新了Kenny Winker的答案,因为sizeWithFont在iOS 7中已被弃用.

-(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;
}

Answer 12

在iOS 11 / Swift 4上，以上答案均对我无济于事。我找到了一些例子，并对此进行了介绍：

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)
    }
}

希望这对某人有帮助。

Answer 13

使用Kenny Winker和simeon的代码,我制作了适合我的快速代码.

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
    }

}

Answer 14

Swift 5 - 以下方法对我有用

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
        )
    }

确保您的按钮标题没有在故事板/xib 中被截断，否则请使用
解决方案 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
        }
    }

}

Answer 15

Swift 5，自动布局

我实现了一些方法的组合，这对我来说效果最好。技巧在于覆盖titleRect(forContentRect:)、imageRect(forContentRect:)方法和intrinsicContentSize这些视图的计算值。

结果：

final class CustomButton: UIButton {

    override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
        let superRect = super.titleRect(forContentRect: contentRect)
        return CGRect(
            x: 0,
            y: contentRect.height - superRect.height,
            width: contentRect.width,
            height: superRect.height
        )
    }

    override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
        let superRect = super.imageRect(forContentRect: contentRect)
        return CGRect(
            x: contentRect.width / 2 - superRect.width / 2,
            y: (contentRect.height - titleRect(forContentRect: contentRect).height) / 2 - superRect.height / 2,
            width: superRect.width,
            height: superRect.height
        )
    }

    override var intrinsicContentSize: CGSize {
        _ = super.intrinsicContentSize
        guard let image = imageView?.image else { return super.intrinsicContentSize }
        let size = titleLabel?.sizeThatFits(contentRect(forBounds: bounds).size) ?? .zero
        let spacing: CGFloat = 12
        return CGSize(width: max(size.width, image.size.width), height: image.size.height + size.height + spacing)
    }

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

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

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

上述解决方案可能不适用于 iOS 12 及更早版本。在这种情况下，根据字体大小创建具有固定图像大小和标签高度的常量。

final class CustomButton: UIButton {

    private enum Constants {
        static let imageSize: CGFloat = 48
        static let titleHeight = yourFont.pointSize - yourFont.descender
    }

    override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
        _ = super.titleRect(forContentRect: contentRect)
        return CGRect(
            x: 0,
            y: contentRect.height - Constants.titleHeight,
            width: contentRect.width,
            height: Constants.titleHeight
        )
    }

    override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
        return CGRect(
            x: contentRect.width / 2 - Constants.imageSize / 2,
            y: (contentRect.height - titleRect(forContentRect: contentRect).height) / 2 - Constants.imageSize / 2,
            width: Constants.imageSize,
            height: Constants.imageSize
        )
    }

    override var intrinsicContentSize: CGSize {
        _ = super.intrinsicContentSize
        let size = titleLabel?.sizeThatFits(contentRect(forBounds: bounds).size) ?? .zero
        let spacing: CGFloat = 12
        return CGSize(
            width: max(size.width, Constants.imageSize),
            height: Constants.imageSize + Constants.titleHeight + spacing
        )
    }

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

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

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

Answer 16

@Tiago 我像这样改变你的答案。它适用于所有尺寸

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
        )
    }

Answer 17

本地化友好的解决方案：

有很多很棒的解决方案，但我想在这里为那些使用本地化的人添加一条注释。

您需要反转左右 EdgeInstets 值，以便在语言方向从 LtR 更改为 RtL 时正确布置按钮。

使用类似的解决方案，我将按如下方式实现它：

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
        )
    }
}