ios - 如何在 Swift 中创建底部对齐的标签？

Question

有几个示例说明如何在 Swift 中创建顶部对齐标签。这是对我有用的:

@IBDesignable class TopAlignedLabel: UILabel {
    override func drawTextInRect(rect: CGRect) {
        if let stringText = text {
            let stringTextAsNSString = stringText as NSString
            var labelStringSize = stringTextAsNSString.boundingRectWithSize(CGSizeMake(CGRectGetWidth(self.frame), CGFloat.max),
                options: NSStringDrawingOptions.UsesLineFragmentOrigin,
                attributes: [NSFontAttributeName: font],
                context: nil).size
            super.drawTextInRect(CGRectMake(0, 0, CGRectGetWidth(self.frame), ceil(labelStringSize.height)))
        } else {
            super.drawTextInRect(rect)
        }
    }
    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        layer.borderWidth = 1
        layer.borderColor = UIColor.blackColor().CGColor
    }
}

我正在尝试修改它以创建一个底部对齐的标签，但很难找到要更改的正确内容。感谢您的帮助!

Answer 1

改变这一行:

super.drawTextInRect(CGRectMake(0, 0, CGRectGetWidth(self.frame), ceil(labelStringSize.height)))

进入这个:

super.drawTextInRect(CGRectMake(0, rect.size.height - labelStringSize.height, CGRectGetWidth(self.frame), ceil(labelStringSize.height)))