我有一个UILabel，我想在顶部和底部添加空格。在限制最小高度的情况下，我将其修改为:
为了做到这一点，我使用了:
override func drawTextInRect(rect: CGRect) {
var insets: UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 10.0, bottom: 0.0, right: 10.0)
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets))
}
但我必须找到不同的方法，因为如果我写了超过两行，问题是一样的:
当前回答
其他回答
我在公认的答案中略加修改。有一个问题，当左tinset和右tinset增加时，一部分文字会消失，b/c标签的宽度会变窄，但高度没有增加，如图所示:
要解决这个问题，你需要重新计算文本的高度，如下所示:
@IBDesignable class PaddingLabel: UILabel {
@IBInspectable var topInset: CGFloat = 20.0
@IBInspectable var bottomInset: CGFloat = 20.0
@IBInspectable var leftInset: CGFloat = 20.0
@IBInspectable var rightInset: CGFloat = 20.0
override func drawTextInRect(rect: CGRect) {
let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets))
}
override func intrinsicContentSize() -> CGSize {
var intrinsicSuperViewContentSize = super.intrinsicContentSize()
let textWidth = frame.size.width - (self.leftInset + self.rightInset)
let newSize = self.text!.boundingRectWithSize(CGSizeMake(textWidth, CGFloat.max), options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: self.font], context: nil)
intrinsicSuperViewContentSize.height = ceil(newSize.size.height) + self.topInset + self.bottomInset
return intrinsicSuperViewContentSize
}
}
和结果:
我希望能帮助一些和我处境相同的人。
只需使用自动布局:
let paddedWidth = myLabel.intrinsicContentSize.width + 2 * padding
myLabel.widthAnchor.constraint(equalToConstant: paddedWidth).isActive = true
完成了。
斯威夫特 4+
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.firstLineHeadIndent = 10
// Swift 4.2++
label.attributedText = NSAttributedString(string: "Your text", attributes: [NSAttributedString.Key.paragraphStyle: paragraphStyle])
// Swift 4.1--
label.attributedText = NSAttributedString(string: "Your text", attributes: [NSAttributedStringKey.paragraphStyle: paragraphStyle])
只需使用一个UIView作为一个superview，并定义一个固定的边距标签与自动布局。
我的解决方案与人们回答的类似，但添加了sizeThatFits来帮助UIKit找出正确的大小。
class InsetLabel : UILabel {
@objc var textInsets: UIEdgeInsets = .zero
override func drawText(in rect: CGRect) {
super.drawText(in: rect.inset(by: textInsets))
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
var s = super.sizeThatFits(CGSize(width: size.width - (textInsets.left + textInsets.right), height: size.height - (textInsets.top + textInsets.bottom)))
s.height += textInsets.top + textInsets.bottom
return s
}
}
