UIColor Swift gives a different Color

Question

I\'m trying to use this Color

share.backgroundColor = UIColor(red: 53, green: 155, blue: 220, alpha: 0.5)

Which it supposed to be a light blue \

Answer 1

I just did this on some test view controller and I've got the light blue color as expected (Xcode 7 beta 3):

self.view.backgroundColor = UIColor(red: 53/255.0, green: 155/255.0, blue: 220/255.0, alpha: 0.5)

Answer 2

The first code is incorrect, that is translated to 1.0, 1.0, 1.0:

let color = UIColor(red: 53, green: 155, blue: 220, alpha: 0.5)

You need to divide it by 255.0 to get it in range 0-1.0, then you should get the right result:

let color = UIColor(red: 53.0/255.0, green: 155.0/255.0, blue: 220.0/255.0, alpha: 1.0)

The only way to get pink with this is combining it with another color. The thing is, that your background color is prone to mixing with another color - you are setting opacity to 0.5. Therefore combining with something else which may be behind it is a very much compelling reason to this behavior. Set the alpha to 1.0 and see what happens.