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
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);
其他回答
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)
Xcode 11.4 Swift 5.2
对于任何试图镜像后退按钮样式的人,像这样的雪佛龙:
import UIKit
class NextBarButton: UIBarButtonItem {
convenience init(target: Any, selector: Selector) {
// Create UIButton
let button = UIButton(frame: .zero)
// Set Title
button.setTitle("Next", for: .normal)
button.setTitleColor(.systemBlue, for: .normal)
button.titleLabel?.font = UIFont.systemFont(ofSize: 17)
// Configure Symbol
let config = UIImage.SymbolConfiguration(pointSize: 19.0, weight: .semibold, scale: .large)
let image = UIImage(systemName: "chevron.right", withConfiguration: config)
button.setImage(image, for: .normal)
// Add Target
button.addTarget(target, action: selector, for: .touchUpInside)
// Put the Image on the right hand side of the button
// Credit to liau-jian-jie for this part
button.transform = CGAffineTransform(scaleX: -1.0, y: 1.0)
button.titleLabel?.transform = CGAffineTransform(scaleX: -1.0, y: 1.0)
button.imageView?.transform = CGAffineTransform(scaleX: -1.0, y: 1.0)
// Customise spacing to match system Back button
button.imageEdgeInsets = UIEdgeInsets(top: 0.0, left: -18.0, bottom: 0.0, right: 0.0)
button.titleEdgeInsets = UIEdgeInsets(top: 0.0, left: -12.0, bottom: 0.0, right: 0.0)
self.init(customView: button)
}
}
实现:
override func viewDidLoad() {
super.viewDidLoad()
let nextButton = NextBarButton(target: self, selector: #selector(nextTapped))
navigationItem.rightBarButtonItem = nextButton
}
@objc func nextTapped() {
// your code
}
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)
])
}
}
更新XCODE 9(通过接口生成器)
在Interface Builder中有一个更简单的方法。
选择UIButton并在View Utilities > Semantic中选择这个选项:
就是这样!很好很简单!
可选-第二步:
如果你想调整图像和标题之间的间距,你可以在这里更改图像插入:
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:
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