Я создаю UIButton
с изображением,
Я написал для этого код ниже:
let btnImg=UIButton.buttonWithType(UIButtonType.Custom) as UIButton
let img = UIImage(named: "turn_left") as UIImage
btnImg.setTitle("Turn left", forState: UIControlState.Normal)
btnImg.setImage(img, forState: UIControlState.Normal)
btnImg.frame = CGRectMake(10, 150, 200, 45)
self.view.addSubview(btnImg)
Но я получил ошибку ниже let img = UIImage(named: "turn_left") as UIImage
:
Swift Compiler error:
Downcast from 'UIImage?' to 'UIImage' only unwraps optionals; did you mean to use '!'?