以编程方式创建按钮并设置背景图像

Create a button programmatically and set a background image(以编程方式创建按钮并设置背景图像)

问题描述

当我尝试在 Swift 中创建按钮并设置背景图片时:

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

let button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
    button.frame = CGRectMake(100, 100, 100, 100)
    button.setImage(IMAGE, forState: UIControlState.Normal)
    button.addTarget(self, action: "btnTouched:", forControlEvents: UIControlEvents.TouchUpInside)

    self.view.addSubview(button)

我总是收到错误消息:无法将表达式的类型 'Void' 转换为类型 'UIImage'".

I always get an error: "Cannot convert the expression's type 'Void' to type 'UIImage'".

推荐答案

你的代码应该如下所示

let image = UIImage(named: "name") as UIImage?
let button   = UIButton(type: UIButtonType.Custom) as UIButton
button.frame = CGRectMake(100, 100, 100, 100)
button.setImage(image, forState: .Normal)
button.addTarget(self, action: "btnTouched:", forControlEvents:.TouchUpInside)
self.view.addSubview(button)

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