从“UIButton”到“UIButton”的条件转换总是成功

Question

i'm a newer on IOS , when i download other workspaces into my xcodes, it give some warnings on the project,anyone helps ? thanks!!! so don't decrease my score, anyone has been a time newer? this is the code

let button = UIButton(type: UIButtonType.System) as? UIButton

Answer 1

You don't need the cast. Swift can easily deduce type in this case. This is enough:

let button = UIButton(type: .System)