ios - UIImage animationImages 色调颜色？

Question

有没有办法给动画中的图像着色？

我知道我可以像这样给单个图像着色:

var imageOne:UIImage = UIImage(named: "pullto_1.png")!;
    imageOne = imageOne.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate);
    refSequence.image = imageOne;

但是当我尝试这样做时，它就不起作用了:

 var imageOne:UIImage = UIImage(named: "pullto_1.png")!;
    imageOne = imageOne.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)

    var image2:UIImage = UIImage(named: "pullto_2.png")!;
    image2 = image2.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)

    var image3:UIImage = UIImage(named: "pullto_3.png")!;
    image3 = image3.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)

    var image4:UIImage = UIImage(named: "pullto_4.png")!;
    image4 = image4.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)

    refSequence.animationImages = NSArray(objects: imageOne,
        image2,
        image3,
        image4

    );

    refSequence.animationDuration = 1.4;
    refSequence.animationRepeatCount = 99;
    refSequence.startAnimating();

我做错了什么吗？有没有什么方法可以给动画中的图像着色？

谢谢

Answer 1

好吧，我希望有一个更简单的解决方案，但这就是我最终做的:

此函数将创建一个具有所需颜色的新图像:

func imageWithColor(img:UIImage, color:UIColor)->UIImage{
    UIGraphicsBeginImageContextWithOptions(img.size, false, img.scale);
    var context = UIGraphicsGetCurrentContext();
    CGContextTranslateCTM(context, 0, img.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextSetBlendMode(context, kCGBlendModeNormal);
    var rect = CGRectMake(0, 0, img.size.width, img.size.height);
    CGContextClipToMask(context, rect, img.CGImage)
    color.setFill();
    CGContextFillRect(context, rect);
    var newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return newImage;
}

然后你可以这样调用它:

var imageOne:UIImage = UIImage(named: "pullto_1.png")!;
    imageOne = imageWithColor(imageOne, color: UIColor.redColor());
    var image2:UIImage = UIImage(named: "pullto_2.png")!;
    image2 = imageWithColor(image2, color: UIColor.redColor());
    var image3:UIImage = UIImage(named: "pullto_3.png")!;
    image3 = imageWithColor(image3, color: UIColor.redColor());
    var image4:UIImage = UIImage(named: "pullto_4.png")!;
    image4 = imageWithColor(image4, color: UIColor.redColor());

    loaderS.animationImages = NSArray(objects: imageOne,
        image2,
        image3,
        image4

    );



    loaderS.animationDuration = 1.4;
    loaderS.animationRepeatCount = 99;
    loaderS.startAnimating();