swift - 通过点击更改 UIButton 的图像 - Swift

Question

我收到此代码的错误..它应该做什么:当用户点击按钮时，图像变为已选中，再次点击，变为未选中。

我收到错误:AnyObject 没有成员名称 'setImage ...

 @IBAction func tick(sender: AnyObject) {
    if let image = UIImage(named:"Unchecked") {
        sender.setImage(UIImage(named:"Checked.png"), forControlState: .Normal)
    }
    if let image = UIImage(named:"Checked") {
        sender.setImage( UIImage(named:"Unchecked.png"), forControlState: .Normal)
    }
}

Answer 1

只需要将(sender:AnyObject)改为(sender:UIButton)如下

@IBAction func tick(sender: UIButton) {
    if let image = UIImage(named:"Unchecked") {
        sender.setImage(UIImage(named:"Checked.png"), forControlState: .Normal)
    }
    if let image = UIImage(named:"Checked") {
        sender.setImage( UIImage(named:"Unchecked.png"), forControlState: .Normal)
    }
}