iOS|iOS UILabel设置内边距 iOSUILabel设置内边距

有时候我们希望可以设置UILabel的内边距，为了解决这个问题，设计MarginLabel如下，继承自UILabel：

class MarginLabel: UILabel {var contentInset: UIEdgeInsets = .zerooverride func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect { var rect: CGRect = super.textRect(forBounds: UIEdgeInsetsInsetRect(bounds, contentInset), limitedToNumberOfLines: numberOfLines) //根据edgeInsets，修改绘制文字的bounds rect.origin.x -= contentInset.left; rect.origin.y -= contentInset.top; rect.size.width += contentInset.left + contentInset.right; rect.size.height += contentInset.top + contentInset.bottom; return rect }override func drawText(in rect: CGRect) { super.drawText(in: UIEdgeInsetsInsetRect(rect, contentInset)) } }

实例化一个MarginLabel：

private lazy var marginLabel: MarginLabel = { MarginLabel().chain .text("测试UILabel内边距测试UILabel内边距测试UILabel内边距测试UILabel内边距测试UILabel内边距测试UILabel内边距") .backgroundColor(UIColor.gray) .textColor(UIColor.white) .numberOfLines(0) .build }()

不设置内边距的时候：