改色有很多细节，我们这里只探讨最简单的，全部有色点改色
var newImage = image.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)
UIGraphicsBeginImageContextWithOptions(newImage.size, false, newImage.scale);
UIColor.redColor().set()
newImage.drawInRect(CGRectMake(0,[......]

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