xcode Swift 为 UIImageView 背景添加透明色
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Swift Add transparent color to UIImageView background
提问by Sameer Hussain
var controllerScreen = UIImageView()
controllerScreen.backgroundColor = UIColor.redColor()
This adds red opaque color to the UIImageView. I want to add a transparent red color. Is there any transparent property or something ?
这会为 UIImageView 添加不透明的红色。我想添加一个透明的红色。有没有透明的财产之类的？
回答by ABakerSmith
As an alternative to @AdamPro13's answer you could do:
作为@AdamPro13 答案的替代方案，您可以执行以下操作：
controllerScreen.backgroundColor = UIColor.redColor().colorWithAlphaComponent(0.5)
回答by AdamPro13
You need to change the alpha value of the red color. You can use something like this: UIColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 0.5)
您需要更改红色的 alpha 值。你可以使用这样的东西：UIColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 0.5)
