Color with Alpha component
suggest changeYou can set the opacity to a certain UIColor without creating a new one using the init(red:_,green:_,blue:_,alpha:_) initializer.
Swift
let colorWithAlpha = UIColor.redColor().colorWithAlphaComponent(0.1)Swift 3
//In Swift Latest Version
_ colorWithAlpha = UIColor.red.withAlphaComponent(0.1)Objective-C
UIColor * colorWithAlpha = [[UIColor redColor] colorWithAlphaComponent:0.1];
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