没有在UIButton上快速设置图像

Question

when i pass static value in bktheme[1] then image is properly set on button.

when i already get value from NSUserDefaults and set as bktheme as under

Defaults = NSUserDefaults.standardUserDefaults()         
       let shape  = Defaults.integerForKey("Chaperone")
       print(shape)    // output: 1
       let str = bkthemes[shape]

       keyImageTypeOne = UIImage(named: str) as UIImage? 

then image is not set so, how can i set image on button

Answer 1

Please try below code.
If you get image name in str then only below code works.
So i want to suggest you at first print value of str in console.

Defaults = NSUserDefaults.standardUserDefaults()
let shape = Defaults.integerForKey("Chaperone")
print(shape)    // output: 1
let str = bkthemes[shape]
yourButton.setImage(UIImage(named: str), forState: UIControlState.Normal)

If you get any issue then give me value of str .

Answer 2

您的代码很好，只是喜欢

keyImageTypeOne.setImage(UIImage(named: str) as UIImage?, forState: .Normal)

Answer 3

You can do this:

let button:UIButton =  UIButton(type: UIButtonType.System)
let image:UIImage = UIImage(named:"nope")!
button.setImage(image, forState: UIControlState.Normal)