如何将Swift中的白色图像着色为另一种颜色？

Question

我想在运行时将白色图标变为另一种颜色,我试图使用从这里采取的方法,但没有成功:

    func maskImageView() {
    var maskImageSize = CGSizeMake(self.downloadImageView.frame.width, self.downloadImageView.frame.height)
    UIGraphicsBeginImageContextWithOptions(maskImageSize, false, 0.0)

    var color = UIColor(white: 1.0, alpha: 1.0)
    color.setFill()

    var rect = CGRectMake(0, 0, self.downloadImageView.frame.width, self.downloadImageView.frame.height)
    UIRectFill(rect)

    color = BrandColors.BRAND_FIRST_COLOR
    color.setFill()

    rect = CGRectMake((self.downloadImageView.frame.width/2)-100, (self.downloadImageView.frame.height/2)-100, 200, 200)
    UIRectFill(rect)

    var maskImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    var maskLayer = CALayer()
    maskLayer.frame = CGRectMake(0, 0, self.downloadImageView.bounds.width, self.downloadImageView.bounds.height)
    maskLayer.contents = maskImage.CGImage
    maskLayer.contentsRect = CGRectMake(0, 0, self.downloadImageView.bounds.width, self.downloadImageView.bounds.height)
    self.downloadImageView.layer.mask = maskLayer;
}

我实际上无法弄清楚这个掩盖的东西是如何工作的.我究竟做错了什么？

Answer 1

我能够使用以下方法完成此任务:

func maskDownloadImageView() {
    downloadImageView.image = downloadImageView.image?.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)
    downloadImageView.tintColor = BrandColors.BRAND_FIRST_COLOR  
}

没有必要使用掩蔽.