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
在尝试了互联网上的多种解决方案后,我没有达到确切的要求。所以我最终编写了自定义实用程序代码。在将来帮助别人。 在swift 4.2上测试
// This function should be called in/after viewDidAppear to let view render
func addArrowImageToButton(button: UIButton, arrowImage:UIImage = #imageLiteral(resourceName: "my_image_name") ) {
let btnSize:CGFloat = 32
let imageView = UIImageView(image: arrowImage)
let btnFrame = button.frame
imageView.frame = CGRect(x: btnFrame.width-btnSize-8, y: btnFrame.height/2 - btnSize/2, width: btnSize, height: btnSize)
button.addSubview(imageView)
//Imageview on Top of View
button.bringSubviewToFront(imageView)
}
其他回答
要在UIButton内右对齐图像,请尝试下面的代码
btn.contentHorizontalAlignment = .right
斯威夫特3:
open override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
var frame = super.imageRect(forContentRect: contentRect)
let imageWidth = frame.size.width
var titleRect = CGRect.zero
titleRect.size = self.title(for: self.state)!.size(attributes: [NSFontAttributeName: self.titleLabel!.font])
titleRect.origin.x = (self.frame.size.width - (titleRect.size.width + imageWidth)) / 2.0 + self.titleEdgeInsets.left - self.titleEdgeInsets.right;
frame.origin.x = titleRect.origin.x + titleRect.size.width - self.imageEdgeInsets.right + self.imageEdgeInsets.left;
return frame
}
open override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
var frame = super.titleRect(forContentRect: contentRect)
if let imageWidth = self.image(for: self.state)?.size.width {
frame.origin.x = (self.frame.size.width - (frame.size.width + imageWidth)) / 2.0 + self.titleEdgeInsets.left - self.titleEdgeInsets.right;
}
return frame
}
如果这需要在UIBarButtonItem中完成,则应该使用额外的视图包装 这是可行的
let view = UIView()
let button = UIButton()
button.setTitle("Skip", for: .normal)
button.setImage(#imageLiteral(resourceName:"forward_button"), for: .normal)
button.semanticContentAttribute = .forceRightToLeft
button.sizeToFit()
view.addSubview(button)
view.frame = button.bounds
navigationItem.rightBarButtonItem = UIBarButtonItem(customView: view)
这行不通
let button = UIButton()
button.setTitle("Skip", for: .normal)
button.setImage(#imageLiteral(resourceName:"forward_button"), for: .normal)
button.semanticContentAttribute = .forceRightToLeft
button.sizeToFit()
navigationItem.rightBarButtonItem = UIBarButtonItem(customView: button)
这里提到的解决方案停止工作,一旦我启用自动布局。我不得不提出我自己的想法:
子类UIButton和覆盖layoutSubviews方法:
//
// MIThemeButtonImageAtRight.m
// Created by Lukasz Margielewski on 7/9/13.
//
#import "MIThemeButtonImageAtRight.h"
static CGRect CGRectByApplyingUIEdgeInsets(CGRect frame, UIEdgeInsets insets);
@implementation MIThemeButtonImageAtRight
- (void)layoutSubviews
{
[super layoutSubviews];
CGRect contentFrame = CGRectByApplyingUIEdgeInsets(self.bounds, self.contentEdgeInsets);
CGRect frameIcon = self.imageView.frame;
CGRect frameText = self.titleLabel.frame;
frameText.origin.x = CGRectGetMinX(contentFrame) + self.titleEdgeInsets.left;
frameIcon.origin.x = CGRectGetMaxX(contentFrame) - CGRectGetWidth(frameIcon);
self.imageView.frame = frameIcon;
self.titleLabel.frame = frameText;
}
@end
static CGRect CGRectByApplyingUIEdgeInsets(CGRect frame, UIEdgeInsets insets){
CGRect f = frame;
f.origin.x += insets.left;
f.size.width -= (insets.left + insets.right);
f.origin.y += (insets.top);
f.size.height -= (insets.top + insets.bottom);
return f;
}
结果:
我决定不使用标准的按钮图像视图,因为所提出的移动它的解决方案感觉很俗气。这让我获得了想要的美感,并且通过改变约束来重新定位按钮是很直观的:
extension UIButton {
func addRightIcon(image: UIImage) {
let imageView = UIImageView(image: image)
imageView.translatesAutoresizingMaskIntoConstraints = false
addSubview(imageView)
let length = CGFloat(15)
titleEdgeInsets.right += length
NSLayoutConstraint.activate([
imageView.leadingAnchor.constraint(equalTo: self.titleLabel!.trailingAnchor, constant: 10),
imageView.centerYAnchor.constraint(equalTo: self.titleLabel!.centerYAnchor, constant: 0),
imageView.widthAnchor.constraint(equalToConstant: length),
imageView.heightAnchor.constraint(equalToConstant: length)
])
}
}
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