iOS 更改图像的颜色

示例

//Swift
imageView.tintColor = UIColor.redColor()
imageView.image = imageView.image?.imageWithRenderingMode(.AlwaysTemplate)

//迅捷3
imageView.tintColor = UIColor.red
imageView.image = imageView.image?.withRenderingMode(.alwaysTemplate)

//Objective-C
imageView.tintColor = [UIColor redColor];
imageView.image = [imageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]