如果可以避免,我不想使用子视图。我想要一个带有背景图像,文本和图像的UIButton。现在,当我这样做的时候,图像在文本的左边。背景图像、文本和图像都有不同的高亮状态。
当前回答
在Piotr Tomasik的优雅解决方案的基础上:如果你想在按钮标签和图像之间有一点间距,那么包括在你的边缘嵌入如下(复制我的代码在这里完美地为我工作):
CGFloat spacing = 3;
CGFloat insetAmount = 0.5 * spacing;
// First set overall size of the button:
button.contentEdgeInsets = UIEdgeInsetsMake(0, insetAmount, 0, insetAmount);
[button sizeToFit];
// Then adjust title and image insets so image is flipped to the right and there is spacing between title and image:
button.titleEdgeInsets = UIEdgeInsetsMake(0, -button.imageView.frame.size.width - insetAmount, 0, button.imageView.frame.size.width + insetAmount);
button.imageEdgeInsets = UIEdgeInsetsMake(0, button.titleLabel.frame.size.width + insetAmount, 0, -button.titleLabel.frame.size.width - insetAmount);
感谢Piotr的解决方案!
Erik
其他回答
当标题发生变化时,只需更新插图即可。你需要在另一侧用等量的、相反的插页来补偿插页。
[thebutton setTitle:title forState:UIControlStateNormal];
thebutton.titleEdgeInsets = UIEdgeInsetsMake(0, -thebutton.imageView.frame.size.width, 0, thebutton.imageView.frame.size.width);
thebutton.imageEdgeInsets = UIEdgeInsetsMake(0, thebutton.titleLabel.frame.size.width, 0, -thebutton.titleLabel.frame.size.width);
我最终创建了一个自定义按钮,允许从检查器设置图像。下面是我的代码:
import UIKit
@IBDesignable
class CustomButton: UIButton {
@IBInspectable var leftImage: UIImage? = nil
@IBInspectable var gapPadding: CGFloat = 0
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required public init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setup()
}
override func layoutSubviews() {
super.layoutSubviews()
setup()
}
func setup() {
if(leftImage != nil) {
let imageView = UIImageView(image: leftImage)
imageView.translatesAutoresizingMaskIntoConstraints = false
addSubview(imageView)
let length = CGFloat(16)
titleEdgeInsets.left += length
NSLayoutConstraint.activate([
imageView.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: gapPadding),
imageView.centerYAnchor.constraint(equalTo: self.titleLabel!.centerYAnchor, constant: 0),
imageView.widthAnchor.constraint(equalToConstant: length),
imageView.heightAnchor.constraint(equalToConstant: length)
])
}
}
}
你可以从检查器中调整空白填充的值来调整文本和图像之间的间距。
PS:使用了一些来自@Mark Hennings答案的代码部分
Swift 4 & 5
改变UIButton图像的方向(RTL和LTR)
extension UIButton {
func changeDirection(){
isArabic ? (self.contentHorizontalAlignment = .right) : (self.contentHorizontalAlignment = .left)
// left-right margin
self.imageEdgeInsets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
self.titleEdgeInsets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
}
}
扩展UiButton并放入这些线条
if let imageWidth = self.imageView?.frame.width {
self.titleEdgeInsets = UIEdgeInsetsMake(0, -imageWidth, 0, imageWidth);
}
if let titleWidth = self.titleLabel?.frame.width {
let spacing = titleWidth + 20
self.imageEdgeInsets = UIEdgeInsetsMake(0, spacing, 0, -spacing);
}
扩展的方法
使用扩展设置图像右侧自定义偏移
extension UIButton {
func addRightImage(image: UIImage, offset: CGFloat) {
self.setImage(image, for: .normal)
self.imageView?.translatesAutoresizingMaskIntoConstraints = false
self.imageView?.centerYAnchor.constraint(equalTo: self.centerYAnchor, constant: 0.0).isActive = true
self.imageView?.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -offset).isActive = true
}
}
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