如果我只将图像放在按钮中并将 imageEdgeInsets 设置为更靠近顶部,则图像将保持居中并且一切都按预期工作:
[button setImage:image forState:UIControlStateNormal];
[button setImageEdgeInsets:UIEdgeInsetsMake(-15.0, 0.0, 0.0, 0.0)];
如果我只在按钮中放置一个文本并将 titleEdgeInsets 设置为更靠近底部,则文本保持居中并且所有工作都按预期工作:
[button setTitle:title forState:UIControlStateNormal];
[button setTitleEdgeInsets:UIEdgeInsetsMake(0.0, 0.0, -30, 0.0)];
但是,如果我将 4 行放在一起,文本会干扰图像并且都失去了中心对齐。
我所有的图像都有 30 像素宽度,如果我将 30 放入 setTitleEdgeInsets 的 UIEdgeInsetMake 的左侧参数中,则文本再次居中。问题是图像永远不会居中,因为它似乎取决于 button.titleLabel 的大小。我已经尝试了许多关于按钮大小、图像大小、titleLabel 大小的计算,但从来没有完全居中。
有人已经有同样的问题了吗?
对于它的价值,这里有一个通用的解决方案,将图像定位在文本上方,而不使用任何幻数。请注意,以下代码已过时,您可能应该使用以下更新版本之一:
// the space between the image and text
CGFloat spacing = 6.0;
// lower the text and push it left so it appears centered
// below the image
CGSize imageSize = button.imageView.frame.size;
button.titleEdgeInsets = UIEdgeInsetsMake(
0.0, - imageSize.width, - (imageSize.height + spacing), 0.0);
// raise the image and push it right so it appears centered
// above the text
CGSize titleSize = button.titleLabel.frame.size;
button.imageEdgeInsets = UIEdgeInsetsMake(
- (titleSize.height + spacing), 0.0, 0.0, - titleSize.width);
以下版本包含以下评论中推荐的支持 iOS 7+ 的更改。我自己没有测试过这段代码,所以我不确定它的工作情况如何,或者如果在以前的 iOS 版本下使用它是否会中断。
// the space between the image and text
CGFloat spacing = 6.0;
// lower the text and push it left so it appears centered
// below the image
CGSize imageSize = button.imageView.image.size;
button.titleEdgeInsets = UIEdgeInsetsMake(
0.0, - imageSize.width, - (imageSize.height + spacing), 0.0);
// raise the image and push it right so it appears centered
// above the text
CGSize titleSize = [button.titleLabel.text sizeWithAttributes:@{NSFontAttributeName: button.titleLabel.font}];
button.imageEdgeInsets = UIEdgeInsetsMake(
- (titleSize.height + spacing), 0.0, 0.0, - titleSize.width);
// increase the content height to avoid clipping
CGFloat edgeOffset = fabsf(titleSize.height - imageSize.height) / 2.0;
button.contentEdgeInsets = UIEdgeInsetsMake(edgeOffset, 0.0, edgeOffset, 0.0);
斯威夫特 5.0 版本
extension UIButton {
func alignVertical(spacing: CGFloat = 6.0) {
guard let imageSize = imageView?.image?.size,
let text = titleLabel?.text,
let font = titleLabel?.font
else { return }
titleEdgeInsets = UIEdgeInsets(
top: 0.0,
left: -imageSize.width,
bottom: -(imageSize.height + spacing),
right: 0.0
)
let titleSize = text.size(withAttributes: [.font: font])
imageEdgeInsets = UIEdgeInsets(
top: -(titleSize.height + spacing),
left: 0.0,
bottom: 0.0,
right: -titleSize.width
)
let edgeOffset = abs(titleSize.height - imageSize.height) / 2.0
contentEdgeInsets = UIEdgeInsets(
top: edgeOffset,
left: 0.0,
bottom: edgeOffset,
right: 0.0
)
}
}
找到方法了。
首先,配置titleLabel
的文本(因为样式,即粗体、斜体等)。然后,考虑到图像的宽度,使用 setTitleEdgeInsets
:
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[button setTitle:title forState:UIControlStateNormal];
[button.titleLabel setFont:[UIFont boldSystemFontOfSize:10.0]];
// Left inset is the negative of image width.
[button setTitleEdgeInsets:UIEdgeInsetsMake(0.0, -image.size.width, -25.0, 0.0)];
之后,考虑到文本边界的宽度,使用 setTitleEdgeInsets
:
[button setImage:image forState:UIControlStateNormal];
// Right inset is the negative of text bounds width.
[button setImageEdgeInsets:UIEdgeInsetsMake(-15.0, 0.0, 0.0, -button.titleLabel.bounds.size.width)];
现在图像和文本将居中(在此示例中,图像显示在文本上方)。
干杯。
您可以使用这个 Swift 扩展来做到这一点,该扩展部分基于 Jesse Crossen 的回答:
extension UIButton {
func centerLabelVerticallyWithPadding(spacing:CGFloat) {
// update positioning of image and title
let imageSize = self.imageView.frame.size
self.titleEdgeInsets = UIEdgeInsets(top:0,
left:-imageSize.width,
bottom:-(imageSize.height + spacing),
right:0)
let titleSize = self.titleLabel.frame.size
self.imageEdgeInsets = UIEdgeInsets(top:-(titleSize.height + spacing),
left:0,
bottom: 0,
right:-titleSize.width)
// reset contentInset, so intrinsicContentSize() is still accurate
let trueContentSize = CGRectUnion(self.titleLabel.frame, self.imageView.frame).size
let oldContentSize = self.intrinsicContentSize()
let heightDelta = trueContentSize.height - oldContentSize.height
let widthDelta = trueContentSize.width - oldContentSize.width
self.contentEdgeInsets = UIEdgeInsets(top:heightDelta/2.0,
left:widthDelta/2.0,
bottom:heightDelta/2.0,
right:widthDelta/2.0)
}
}
这定义了一个函数 centerLabelVerticallyWithPadding
,它适当地设置标题和图像插图。
它还设置 contentEdgeInsets,我认为这是确保 intrinsicContentSize
仍然正常工作所必需的,这需要使用自动布局。
我相信所有子类 UIButton 的解决方案在技术上都是非法的,因为你不应该继承 UIKit 控件。即,理论上它们可能会在未来的版本中中断。
编辑:为 Swift 3 更新
如果您正在寻找 Jesse Crossen 答案的 Swift 解决方案,您可以将其添加到 UIButton 的子类中:
override func layoutSubviews() {
let spacing: CGFloat = 6.0
// lower the text and push it left so it appears centered
// below the image
var titleEdgeInsets = UIEdgeInsets.zero
if let image = self.imageView?.image {
titleEdgeInsets.left = -image.size.width
titleEdgeInsets.bottom = -(image.size.height + spacing)
}
self.titleEdgeInsets = titleEdgeInsets
// raise the image and push it right so it appears centered
// above the text
var imageEdgeInsets = UIEdgeInsets.zero
if let text = self.titleLabel?.text, let font = self.titleLabel?.font {
let attributes = [NSFontAttributeName: font]
let titleSize = text.size(attributes: attributes)
imageEdgeInsets.top = -(titleSize.height + spacing)
imageEdgeInsets.right = -titleSize.width
}
self.imageEdgeInsets = imageEdgeInsets
super.layoutSubviews()
}
这里有一些很好的例子,但在处理多行文本(文本换行)时,我无法让它在所有情况下都能正常工作。为了最终让它发挥作用,我结合了几种技术:
我使用了上面的 Jesse Crossen 示例。但是,我修复了文本高度问题,并添加了指定水平文本边距的功能。当允许文本换行时,边距很有用,因此它不会碰到按钮的边缘: // 图像和文本之间的空间 CGFloat spacing = 10.0;浮动文本边距 = 6; // 为了便于阅读,这里获取元素的大小 CGSize imageSize = picImage.size; CGSize titleSize = button.titleLabel.frame.size; CGFloat totalHeight = (imageSize.height + titleSize.height + 间距); // 获取它们作为一个单位占用的高度 // 降低文本并将其向左推使其居中 button.titleEdgeInsets = UIEdgeInsetsMake( 0.0, -imageSize.width +textMargin, - (totalHeight - titleSize.height), +textMargin ); // 上、左、下、右 // 文本宽度可能已经改变(如果之前由于空间不足而缩短,现在不再存在),所以我们再次获取帧大小 titleSize = button. titleLabel.bounds.size; button.imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + 间距), 0.0, 0.0, -titleSize.width); // top, left, bottom, right 确保你设置了文本标签来换行 button.titleLabel.numberOfLines = 2; button.titleLabel.lineBreakMode = UILineBreakModeWordWrap; button.titleLabel.textAlignment = UITextAlignmentCenter;这将大部分工作现在。但是,我有一些按钮无法正确呈现其图像。图像要么向右或向左移动(它没有居中)。所以我使用了 UIButton 布局覆盖技术来强制 imageView 居中。 @interface CategoryButton : UIButton @end @implementation CategoryButton - (void)layoutSubviews { // 允许默认布局,然后居中 imageView [super layoutSubviews]; UIImageView *imageView = [self imageView]; CGRect imageFrame = imageView.frame; imageFrame.origin.x = (int)((self.frame.size.width - imageFrame.size.width)/ 2); imageView.frame = imageFrame; } @结尾
我为@TodCunningham 的回答做了一个方法
-(void) AlignTextAndImageOfButton:(UIButton *)button
{
CGFloat spacing = 2; // the amount of spacing to appear between image and title
button.imageView.backgroundColor=[UIColor clearColor];
button.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
button.titleLabel.textAlignment = UITextAlignmentCenter;
// get the size of the elements here for readability
CGSize imageSize = button.imageView.frame.size;
CGSize titleSize = button.titleLabel.frame.size;
// lower the text and push it left to center it
button.titleEdgeInsets = UIEdgeInsetsMake(0.0, - imageSize.width, - (imageSize.height + spacing), 0.0);
// the text width might have changed (in case it was shortened before due to
// lack of space and isn't anymore now), so we get the frame size again
titleSize = button.titleLabel.frame.size;
// raise the image and push it right to center it
button.imageEdgeInsets = UIEdgeInsetsMake(- (titleSize.height + spacing), 0.0, 0.0, - titleSize.width);
}
Jesse Crossen 更新了 Swift 4 的答案:
extension UIButton {
func alignVertical(spacing: CGFloat = 6.0) {
guard let imageSize = self.imageView?.image?.size,
let text = self.titleLabel?.text,
let font = self.titleLabel?.font
else { return }
self.titleEdgeInsets = UIEdgeInsets(top: 0.0, left: -imageSize.width, bottom: -(imageSize.height + spacing), right: 0.0)
let labelString = NSString(string: text)
let titleSize = labelString.size(withAttributes: [kCTFontAttributeName as NSAttributedStringKey: font])
self.imageEdgeInsets = UIEdgeInsets(top: -(titleSize.height + spacing), left: 0.0, bottom: 0.0, right: -titleSize.width)
let edgeOffset = abs(titleSize.height - imageSize.height) / 2.0;
self.contentEdgeInsets = UIEdgeInsets(top: edgeOffset, left: 0.0, bottom: edgeOffset, right: 0.0)
}
}
使用这种方式:
override func viewDidLayoutSubviews() {
button.alignVertical()
}
为 Xcode 11+ 更新
在我的原始答案中描述的插图已被移至最新版本的 Xcode 中的尺寸检查器。我不是 100% 清楚切换发生的时间,但如果在属性检查器中找不到插入信息,读者应该查看尺寸检查器。下面是新插入屏幕的示例(从 11.5 开始位于尺寸属性检查器的顶部)。
https://i.stack.imgur.com/m21Rb.png
原始答案
其他答案没有错,但是我只想指出,可以使用零行代码在 Xcode 中直观地完成相同的行为。如果您不需要计算值或使用故事板/xib 构建(否则适用其他解决方案),此解决方案很有用。
注意 - 我确实理解 OP 的问题是需要代码的问题。我只是为了完整性而提供这个答案,并作为那些使用故事板/xibs 的人的逻辑替代方案。
要使用边缘插图修改按钮的图像、标题和内容视图的间距,您可以选择按钮/控件并打开属性检查器。向下滚动到检查器的中间,找到 Edge insets 部分。
https://i.stack.imgur.com/T61qP.png
还可以访问和修改标题、图像或内容视图的特定边缘插图。
https://i.stack.imgur.com/jhPEF.png
不要对抗系统。如果您的布局变得过于复杂而无法使用 Interface Builder + 或者一些简单的配置代码来管理,请使用 layoutSubviews
以更简单的方式手动执行布局 - 这就是它的用途!其他一切都将等同于黑客攻击。
创建一个 UIButton 子类并覆盖其 layoutSubviews
方法以对齐您的文本和以编程方式显示图像。或者使用 https://github.com/nickpaulson/BlockKit/blob/master/Source/UIView-BKAdditions.h 之类的东西,这样您就可以使用块来实现 layoutSubviews。
子类 UIButton
- (void)layoutSubviews {
[super layoutSubviews];
CGFloat spacing = 6.0;
CGSize imageSize = self.imageView.image.size;
CGSize titleSize = [self.titleLabel sizeThatFits:CGSizeMake(self.frame.size.width, self.frame.size.height - (imageSize.height + spacing))];
self.imageView.frame = CGRectMake((self.frame.size.width - imageSize.width)/2, (self.frame.size.height - (imageSize.height+spacing+titleSize.height))/2, imageSize.width, imageSize.height);
self.titleLabel.frame = CGRectMake((self.frame.size.width - titleSize.width)/2, CGRectGetMaxY(self.imageView.frame)+spacing, titleSize.width, titleSize.height);
}
https://i.stack.imgur.com/F7iDR.png
extension UIButton {
func alignTextUnderImage() {
guard let imageView = imageView else {
return
}
self.contentVerticalAlignment = .Top
self.contentHorizontalAlignment = .Center
let imageLeftOffset = (CGRectGetWidth(self.bounds) - CGRectGetWidth(imageView.bounds)) / 2//put image in center
let titleTopOffset = CGRectGetHeight(imageView.bounds) + 5
self.imageEdgeInsets = UIEdgeInsetsMake(0, imageLeftOffset, 0, 0)
self.titleEdgeInsets = UIEdgeInsetsMake(titleTopOffset, -CGRectGetWidth(imageView.bounds), 0, 0)
}
}
使用 Swift 3+ 语法的 UIButton 扩展:
extension UIButton {
func alignImageAndTitleVertically(padding: CGFloat = 6.0) {
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.size(attributes: [NSFontAttributeName: titleLabel!.font])
self.imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + padding), 0.0, 0.0, -titleSize.width)
let edgeOffset = abs(titleSize.height - imageSize.height) / 2.0;
self.contentEdgeInsets = UIEdgeInsetsMake(edgeOffset, 0.0, edgeOffset, 0.0)
}
}
原始答案:https://stackoverflow.com/a/7199529/3659227
对 Jesse Crossen 的回答稍作改动,就让它对我来说非常完美:
代替:
CGSize titleSize = button.titleLabel.frame.size;
我用过这个:
CGSize titleSize = [button.titleLabel.text sizeWithAttributes: @{NSFontAttributeName:button.titleLabel.font}];
仅当标签足够短而不会被截断时,使用 button.titleLabel.frame.size.width
才能正常工作。当标签文本被截断时,定位不起作用。服用
CGSize titleSize = [[[button titleLabel] text] sizeWithFont:[[button titleLabel] font]];
即使标签文本被截断,也对我有用。
我查看了现有的答案,但我也发现设置按钮框架是重要的第一步。
这是我使用的一个函数来处理这个问题:
const CGFloat kImageTopOffset = -15;
const CGFloat kTextBottomOffset = -25;
+ (void) centerButtonImageTopAndTextBottom: (UIButton*) button
frame: (CGRect) buttonFrame
text: (NSString*) textString
textColor: (UIColor*) textColor
font: (UIFont*) textFont
image: (UIImage*) image
forState: (UIControlState) buttonState
{
button.frame = buttonFrame;
[button setTitleColor: (UIColor*) textColor
forState: (UIControlState) buttonState];
[button setTitle: (NSString*) textString
forState: (UIControlState) buttonState ];
[button.titleLabel setFont: (UIFont*) textFont ];
[button setTitleEdgeInsets: UIEdgeInsetsMake( 0.0, -image.size.width, kTextBottomOffset, 0.0)];
[button setImage: (UIImage*) image
forState: (UIControlState) buttonState ];
[button setImageEdgeInsets: UIEdgeInsetsMake( kImageTopOffset, 0.0, 0.0,- button.titleLabel.bounds.size.width)];
}
或者你可以只使用这个类别:
@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);
}
- (void)centerVertically
{
const CGFloat kDefaultPadding = 6.0f;
[self centerVerticallyWithPadding:kDefaultPadding];
}
@end
CGSize titleSize = [button.titleLabel.text sizeWithAttributes: @{NSFontAttributeName: button.titleLabel.font}];
我的用例使插图无法管理:
按钮上的背景图像在字符串长度和图像大小变化的情况下保持一致的动态文本和图像变化
这就是我最终做的事情,我对此感到非常满意:
使用背景图像(带有模糊和颜色的圆形圆圈)在情节提要上创建按钮。
在我的班级中声明一个 UIImageView:@implementation BlahViewController { UIImageView *_imageView; }
在 init 上创建图像视图实例:-(id)initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; if (self) { _imageView = [[UIImageView alloc] initWithCoder:aDecoder]; } 返回自我; }
在 viewDidLoad 中为我们的图像视图添加一个新层到按钮并设置文本对齐:[self.btn addSubview:_imageView]; [self.btn.titleLabel setTextAlignment:NSTextAlignmentCenter];
在按钮单击方法中,将我选择的叠加图像添加到图像视图中,调整其大小以适合图像并将其居中放置在按钮中,但将其向上移动 15,以便我可以将文本偏移量放在其下方: [_imageView setImage:[UIImage imageNamed: @"blahImageBlah]]; [_imageView sizeToFit]; _imageView.center = CGPointMake(ceilf(self.btn.bounds.size.width / 2.0f), ceilf((self.btn.bounds.size.height / 2.0f) - 15)); [self.btn setTitle:@"Some new text" forState:UIControlStateNormal];
注意: ceilf() 对于确保它位于图像质量的像素边界上很重要。
假设您希望文本和图像都水平居中,图像上方的文本:将来自界面构建器的文本居中并添加顶部插图(为图像腾出空间)。 (将左插图保留为 0)。使用界面生成器选择图像 - 它的实际位置将从代码中设置,所以不用担心在 IB 中看起来不正常。与上面的其他答案不同,这实际上适用于所有当前支持的 ios 版本(5,6 和 7)。
在代码中,只需在抓取图像后丢弃按钮的 ImageView(通过将按钮的图像设置为 null)(这也会自动将文本居中,必要时进行包装)。然后用相同的帧大小和图像实例化自己的ImageView,并将其定位在中间。
这样您仍然可以从界面生成器中选择图像(尽管它不会像在模拟器中那样在 IB 中对齐,但话又说回来,其他解决方案并不兼容所有支持的 ios 版本)
我正在努力完成这项工作,因为我无法在视图的构造函数上获得图像大小和文本宽度。 Jesse's answer 上的两个小改动对我有用:
CGFloat spacing = 3;
self.titleEdgeInsets = UIEdgeInsetsMake(0.0, - image.size.width, - (image.size.height + spacing), 0.0);
CGSize titleSize = [name sizeWithAttributes:@{NSFontAttributeName:self.titleLabel.font}];
self.imageEdgeInsets = UIEdgeInsetsMake(- (titleSize.height + spacing), 0.0, 0.0, - titleSize.width);
变化是:
使用 [NSString sizeWithAttributes] 获取文本宽度;
直接在 UIImage 而不是 UIImageView 上获取图像大小
这对我来说很好,对于几个按钮,具有不同的图像宽度和不同的标题长度:
子类 UIButton
override func layoutSubviews() {
super.layoutSubviews()
if let image = imageView?.image {
let margin = 30 - image.size.width / 2
let titleRect = titleRectForContentRect(bounds)
let titleOffset = (bounds.width - titleRect.width - image.size.width - margin) / 2
contentHorizontalAlignment = UIControlContentHorizontalAlignment.Left
imageEdgeInsets = UIEdgeInsetsMake(0, margin, 0, 0)
titleEdgeInsets = UIEdgeInsetsMake(0, (bounds.width - titleRect.width - image.size.width - margin) / 2, 0, 0)
}
}
按钮大小为 80x80 像素的工作正常。
[self.leftButton setImageEdgeInsets:UIEdgeInsetsMake(0, 10.0, 20.0, 10.0)];
[self.leftButton setTitleEdgeInsets:UIEdgeInsetsMake(60, -75.0, 0.0, 0.0)];
我确实做了一些调整,使图像在水平中心对齐:
// the space between the image and text
let spacing = CGFloat(36.0);
// lower the text and push it left so it appears centered
// below the image
let imageSize = tutorialButton.imageView!.frame.size;
tutorialButton.titleEdgeInsets = UIEdgeInsetsMake(
0, -CGFloat(imageSize.width), -CGFloat(imageSize.height + spacing), 0.0);
// raise the image and push it right so it appears centered
// above the text
let titleSize = tutorialButton.titleLabel!.frame.size;
tutorialButton.imageEdgeInsets = UIEdgeInsetsMake(
-CGFloat(titleSize.height + spacing), CGFloat((tutorialButton.frame.width - imageSize.width) / 2), 0.0, -CGFloat(titleSize.width));
是否必须使用边缘插图?如果没有,您可以尝试定位对中心父视图的尊重
extension UIButton
{
func centerImageAndTextVerticaAlignment(spacing: CGFloat)
{
var titlePoint : CGPoint = convertPoint(center, fromView:superview)
var imageViewPoint : CGPoint = convertPoint(center, fromView:superview)
titlePoint.y += ((titleLabel?.size.height)! + spacing)/2
imageViewPoint.y -= ((imageView?.size.height)! + spacing)/2
titleLabel?.center = titlePoint
imageView?.center = imageViewPoint
}
}
您需要将图像向右移动文本的宽度。然后将文本向左移动图像的宽度。
UIEdgeInsets imageEdgeInsets = self.remoteCommandsButtonLights.imageEdgeInsets;
imageEdgeInsets.left = [button.titleLabel.text sizeWithAttributes:@{NSFontAttributeName:[button.titleLabel font]}].width;
imageEdgeInsets.bottom = 14.0;
button.imageEdgeInsets = imageEdgeInsets;
UIEdgeInsets titleEdgeInsets = self.remoteCommandsButtonLights.titleEdgeInsets;
titleEdgeInsets.left = -button.currentImage.size.width;
titleEdgeInsets.top = 20.0;
button.titleEdgeInsets = titleEdgeInsets;
然后调整顶部和底部插图以调整 Y 轴。这也可以通过编程方式完成,但对于您的图像大小应该是恒定的。而 X 轴插图需要根据每个按钮中文本标签的大小进行更改。
在扩展 Swift 4.2 中添加此代码
func moveImageLeftTextCenter(imagePadding: CGFloat = 30.0){
guard let imageViewWidth = self.imageView?.frame.width else{return}
guard let titleLabelWidth = self.titleLabel?.intrinsicContentSize.width else{return}
self.contentHorizontalAlignment = .left
imageEdgeInsets = UIEdgeInsets(top: 0.0, left: imagePadding - imageViewWidth / 2, bottom: 0.0, right: 0.0)
titleEdgeInsets = UIEdgeInsets(top: 0.0, left: (bounds.width - titleLabelWidth) / 2 - imageViewWidth, bottom: 0.0, right: 0.0)
}
func moveImageRIghtTextCenter(imagePadding: CGFloat = 30.0){
guard let imageViewWidth = self.imageView?.frame.width else{return}
guard let titleLabelWidth = self.titleLabel?.intrinsicContentSize.width else{return}
self.contentHorizontalAlignment = .right
imageEdgeInsets = UIEdgeInsets(top: 0.0, left:0.0 , bottom: 0.0, right: imagePadding - imageViewWidth / 2)
titleEdgeInsets = UIEdgeInsets(top: 0.0, left:0.0 , bottom: 0.0, right:(bounds.width - titleLabelWidth) / 2 - imageViewWidth)
}
只是为了投入我的 2 美分,这对我有用:
extension UIButton {
public func centerImageAndTextVertically(spacing: CGFloat) {
layoutIfNeeded()
let contentFrame = contentRect(forBounds: bounds)
let imageFrame = imageRect(forContentRect: contentFrame)
let imageLeftInset = bounds.size.width * 0.5 - imageFrame.size.width * 0.5
let imageTopInset = -(imageFrame.size.height + spacing * 0.5)
let titleFrame = titleRect(forContentRect: contentFrame)
let titleLeftInset = ((bounds.size.width - titleFrame.size.width) * 0.5) - imageFrame.size.width
let titleTopInmset = titleFrame.size.height + spacing * 0.5
imageEdgeInsets = UIEdgeInsets(top: imageTopInset, left: imageLeftInset, bottom: 0, right: 0)
titleEdgeInsets = UIEdgeInsets(top: titleTopInmset, left: titleLeftInset, bottom: 0, right: 0)
}
}
不定期副业成功案例分享
button.currentTitle
而不是button.titleLabel.text
更好,尤其是在按钮文本会发生变化的情况下。currentTitle
会立即填充,而titleLabel.text
的更改可能会很慢,这可能会导致插入不对齐。