iOS-UILabel插入为零不起作用
我之所以遵循本教程,是因为我想删除内部标签中的填充 代码似乎非常有用,但我不想让它工作:iOS-UILabel插入为零不起作用,ios,Ios,我之所以遵循本教程,是因为我想删除内部标签中的填充 代码似乎非常有用,但我不想让它工作: import UIKit @IBDesignable class EdgeInsetLabel: UILabel { var textInsets = UIEdgeInsets.zero { didSet { invalidateIntrinsicContentSize() } } override func textRect(forBounds bounds: C
import UIKit
@IBDesignable
class EdgeInsetLabel: UILabel {
var textInsets = UIEdgeInsets.zero {
didSet { invalidateIntrinsicContentSize() }
}
override func textRect(forBounds bounds: CGRect,
limitedToNumberOfLines numberOfLines: Int) -> CGRect {
let insetRect = bounds.inset(by: textInsets)
let textRect = super.textRect(forBounds: insetRect, limitedToNumberOfLines: numberOfLines)
let invertedInsets = UIEdgeInsets(top: -textInsets.top,
left: -textInsets.left,
bottom: -textInsets.bottom,
right: -textInsets.right)
return textRect.inset(by: invertedInsets)
}
override func drawText(in rect: CGRect) {
super.drawText(in: rect.inset(by: textInsets))
}
}
extension EdgeInsetLabel {
@IBInspectable
var leftTextInset: CGFloat {
set { textInsets.left = newValue }
get { return textInsets.left }
}
@IBInspectable
var rightTextInset: CGFloat {
set { textInsets.right = newValue }
get { return textInsets.right }
}
@IBInspectable
var topTextInset: CGFloat {
set { textInsets.top = newValue }
get { return textInsets.top }
}
@IBInspectable
var bottomTextInset: CGFloat {
set { textInsets.bottom = newValue }
get { return textInsets.bottom }
}
}
结果是:
我缺少什么?使用
myLabel.sizeToFit()
删除标签周围的任何可移动空间。您缺少了textRect(forBounds:)
子类中的重写textRect部分:
override func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
let insetRect = UIEdgeInsetsInsetRect(bounds, textInsets)
let textRect = super.textRect(forBounds: insetRect, limitedToNumberOfLines: numberOfLines)
let invertedInsets = UIEdgeInsets(top: -textInsets.top,
left: -textInsets.left,
bottom: -textInsets.bottom,
right: -textInsets.right)
return UIEdgeInsetsInsetRect(textRect, invertedInsets)
}
插图基于单个字符的字体--而非:
因此,使用UILabel
中的默认系统字体,添加一些其他字符:
如果要将背景剪裁到单个字符的边界框中,则需要使用Text Kit
函数。这里有一个很好的开始:我添加了,但没有改变。没有改变