我想在两行文本的左边放置一个图标，这样在图像和文本开始之间有大约2-3像素的空间。控件本身水平居中对齐(通过接口生成器设置)
这个按钮应该是这样的:
| |
|[Image] Add To |
| Favorites |
我试图配置这与contenttedgeinset, imageEdgeInsets和titleEdgeInsets无效。我知道，负值会使边缘扩大，而正值会使边缘缩小，使边缘更接近中心。
我试着:
[button setTitleEdgeInsets:UIEdgeInsetsMake(0, -image.size.width, 0, 0)];
[button setImageEdgeInsets:UIEdgeInsetsMake(0, button.titleLabel.bounds.size.width, 0, 0)];
但这并没有正确显示它。我一直在调整这些值，但从-5到-10的左插入值似乎不会以预期的方式移动它。-10将文本一直向左移动，所以我期望-5将它从左侧移动一半，但事实并非如此。
嵌套背后的逻辑是什么?我不熟悉图像放置和相关术语。
我用这个SO问题作为参考，但我的价值观有些不对。
UIButton:如何使用imageEdgeInsets和titleEdgeInsets居中图像和文本?
Riley Avron回答的一个小补充，以解释地区变化:
extension UIButton {
func centerTextAndImage(spacing: CGFloat) {
let insetAmount = spacing / 2
let writingDirection = UIApplication.sharedApplication().userInterfaceLayoutDirection
let factor: CGFloat = writingDirection == .LeftToRight ? 1 : -1
self.imageEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount*factor, bottom: 0, right: insetAmount*factor)
self.titleEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount*factor, bottom: 0, right: -insetAmount*factor)
self.contentEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: insetAmount)
}
}
快4.倍
extension UIButton {
func centerTextAndImage(spacing: CGFloat) {
let insetAmount = spacing / 2
let writingDirection = UIApplication.shared.userInterfaceLayoutDirection
let factor: CGFloat = writingDirection == .leftToRight ? 1 : -1
self.imageEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount*factor, bottom: 0, right: insetAmount*factor)
self.titleEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount*factor, bottom: 0, right: -insetAmount*factor)
self.contentEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: insetAmount)
}
}
用法:
button.centerTextAndImage(spacing: 10.0)
在swift 5.3和@ravron的启发下回答:
extension UIButton {
/// Fits the image and text content with a given spacing
/// - Parameters:
/// - spacing: Spacing between the Image and the text
/// - contentXInset: The spacing between the view to the left image and the right text to the view
func setHorizontalMargins(imageTextSpacing: CGFloat, contentXInset: CGFloat = 0) {
let imageTextSpacing = imageTextSpacing / 2
contentEdgeInsets = UIEdgeInsets(top: 0, left: (imageTextSpacing + contentXInset), bottom: 0, right: (imageTextSpacing + contentXInset))
imageEdgeInsets = UIEdgeInsets(top: 0, left: -imageTextSpacing, bottom: 0, right: imageTextSpacing)
titleEdgeInsets = UIEdgeInsets(top: 0, left: imageTextSpacing, bottom: 0, right: -imageTextSpacing)
}
}
它增加了一个额外的水平边距，从视图到图像，从标签到视图
如果你想做一些类似的东西
你需要
1.为按钮设置水平和垂直对齐
Find all required values and set UIImageEdgeInsets
CGSize buttonSize = button.frame.size;
NSString *buttonTitle = button.titleLabel.text;
CGSize titleSize = [buttonTitle sizeWithAttributes:@{ NSFontAttributeName : [UIFont camFontZonaProBoldWithSize:12.f] }];
UIImage *buttonImage = button.imageView.image;
CGSize buttonImageSize = buttonImage.size;
CGFloat offsetBetweenImageAndText = 10; //vertical space between image and text
[button setImageEdgeInsets:UIEdgeInsetsMake((buttonSize.height - (titleSize.height + buttonImageSize.height)) / 2 - offsetBetweenImageAndText,
(buttonSize.width - buttonImageSize.width) / 2,
0,0)];
[button setTitleEdgeInsets:UIEdgeInsetsMake((buttonSize.height - (titleSize.height + buttonImageSize.height)) / 2 + buttonImageSize.height + offsetBetweenImageAndText,
titleSize.width + [button imageEdgeInsets].left > buttonSize.width ? -buttonImage.size.width + (buttonSize.width - titleSize.width) / 2 : (buttonSize.width - titleSize.width) / 2 - buttonImage.size.width,
0,0)];
这将在按钮上排列标题和图像。
此外，请注意更新这在每个转播
斯威夫特
import UIKit
extension UIButton {
// MARK: - UIButton+Aligment
func alignContentVerticallyByCenter(offset:CGFloat = 10) {
let buttonSize = frame.size
if let titleLabel = titleLabel,
let imageView = imageView {
if let buttonTitle = titleLabel.text,
let image = imageView.image {
let titleString:NSString = NSString(string: buttonTitle)
let titleSize = titleString.sizeWithAttributes([
NSFontAttributeName : titleLabel.font
])
let buttonImageSize = image.size
let topImageOffset = (buttonSize.height - (titleSize.height + buttonImageSize.height + offset)) / 2
let leftImageOffset = (buttonSize.width - buttonImageSize.width) / 2
imageEdgeInsets = UIEdgeInsetsMake(topImageOffset,
leftImageOffset,
0,0)
let titleTopOffset = topImageOffset + offset + buttonImageSize.height
let leftTitleOffset = (buttonSize.width - titleSize.width) / 2 - image.size.width
titleEdgeInsets = UIEdgeInsetsMake(titleTopOffset,
leftTitleOffset,
0,0)
}
}
}
}
在Swift 3中有一种优雅的方式，更好地理解:
override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
let leftMargin:CGFloat = 40
let imgWidth:CGFloat = 24
let imgHeight:CGFloat = 24
return CGRect(x: leftMargin, y: (contentRect.size.height-imgHeight) * 0.5, width: imgWidth, height: imgHeight)
}
override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
let leftMargin:CGFloat = 80
let rightMargin:CGFloat = 80
return CGRect(x: leftMargin, y: 0, width: contentRect.size.width-leftMargin-rightMargin, height: contentRect.size.height)
}
override func backgroundRect(forBounds bounds: CGRect) -> CGRect {
let leftMargin:CGFloat = 10
let rightMargin:CGFloat = 10
let topMargin:CGFloat = 10
let bottomMargin:CGFloat = 10
return CGRect(x: leftMargin, y: topMargin, width: bounds.size.width-leftMargin-rightMargin, height: bounds.size.height-topMargin-bottomMargin)
}
override func contentRect(forBounds bounds: CGRect) -> CGRect {
let leftMargin:CGFloat = 5
let rightMargin:CGFloat = 5
let topMargin:CGFloat = 5
let bottomMargin:CGFloat = 5
return CGRect(x: leftMargin, y: topMargin, width: bounds.size.width-leftMargin-rightMargin, height: bounds.size.height-topMargin-bottomMargin)
}
