【Swift】UILabel 设置内边距

class UILabelPadding : UILabel {

    private var padding = UIEdgeInsetsZero

    @IBInspectable
    var paddingLeft: CGFloat {
        get { return padding.left }
        set { padding.left = newValue }
    }

    @IBInspectable
    var paddingRight: CGFloat {
        get { return padding.right }
        set { padding.right = newValue }
    }

    @IBInspectable
    var paddingTop: CGFloat {
        get { return padding.top }
        set { padding.top = newValue }
    }

    @IBInspectable
    var paddingBottom: CGFloat {
        get { return padding.bottom }
        set { padding.bottom = newValue }
    }

    override func drawTextInRect(rect: CGRect) {
        super.drawTextInRect(UIEdgeInsetsInsetRect(rect, padding))
    }

    override func textRectForBounds(bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
        let insets = self.padding
        var rect = super.textRectForBounds(UIEdgeInsetsInsetRect(bounds, insets), limitedToNumberOfLines: numberOfLines)
        rect.origin.x    -= insets.left
        rect.origin.y    -= insets.top
        rect.size.width  += (insets.left + insets.right)
        rect.size.height += (insets.top + insets.bottom)
        return rect
    }

}

　　代码说明：

　　　　通过 IBInspectable 可以支持 UILable 在 Storyboard 里面就能指定内边距，非常方便：

　　参考

　参考这篇文章 http://stackoverflow.com/questions/21167226/resizing-a-uilabel-to-accomodate-insets 改的，注意这篇文章 http://stackoverflow.com/questions/3476646/uilabel-text-margin 有问题。

本文转自博客园农民伯伯的博客，原文链接：【Swift】UILabel 设置内边距，如需转载请自行联系原博主。