我认为我的解决方案不那么麻烦：

I think my solution is far less cumbersome:

        let maskLayer = CALayer()
        maskLayer.frame =  layer.bounds
        maskLayer.contents = tintedImage.CGImage
        layer.mask = maskLayer
        layer.backgroundColor = UIColor.redColor().CGColor

让我知道它是否正常工作：）

let me know if it works fine:)