Create a button programmatically and set a background image

Question

When I try creating a button and setting a background image in Swift:

let button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
    button.fram         


        

Answer 1

You need check for image is not nil before assign it to button.

Example:

let button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
button.frame = CGRectMake(100, 100, 100, 100)
if let image  = UIImage(named: "imagename.png") {
    button.setImage(image, forState: .Normal)
}

button.addTarget(self, action: "btnTouched:", forControlEvents:.TouchUpInside)
self.view.addSubview(button)