[英]addTarget not working for UIButton created in Swift
因此,我使用 Swift 創建了一個 UIButton,並使用以下代碼對其進行了動畫處理,並且它是超級視圖:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//create a UIView to contain buttons. Set background color to nil, so it's transparent.
var controlsView = UIView(frame: CGRect(x:0, y:0, width:400, height:400));
controlsView.alpha = 1.0
controlsView.backgroundColor = nil
//create a button and add some attributes. Self explanatory
var loginButton: UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton
loginButton.frame = CGRectMake(20.0, 40.0, 200, 60)
loginButton.alpha = 0.0
loginButton.setTitle("Login", forState: .Normal)
loginButton.titleColorForState(.Normal)
loginButton.layer.cornerRadius = 20;
loginButton.layer.borderWidth = 1.0
loginButton.layer.borderColor = CGColorCreate(CGColorSpaceCreateDeviceRGB(), [0.827, 0.325, 0.0, 1.0])
loginButton.addTarget(self, action: "loginPressed:", forControlEvents: .TouchUpInside)
//add the button to the view created to hold it
controlsView.addSubview(loginButton)
//now test blurring the background view. Create a UIVisualEffectView to create the blur effect. New in iOS7/8
/*
var visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .Light)) as UIVisualEffectView
visualEffectView.frame = self.introImage.bounds
self.introImage.addSubview(visualEffectView)
visualEffectView.alpha = 0.0
*/
//add the controls subview to the image view already here.
self.introImage.addSubview(controlsView)
//loginButton.addTarget(self, action: "loginButtonWasPressed:",forControlEvents:.TouchUpInside)
UIView.animateWithDuration(0.7,
animations: {
loginButton.alpha = 1.0
loginButton.frame = CGRect(x: 20.0, y: 100.0, width: 200, height: 60)
//visualEffectView.alpha = 0.5
},
completion:nil)
}
這工作正常。 然后我創建了一個函數,它應該在我上面創建的按鈕的 touchUpInside 上調用:
@IBAction func loginPressed(sender:UIButton){
var alertView = UIAlertView();
alertView.addButtonWithTitle("Ok");
alertView.title = "title";
alertView.message = "message";
alertView.show();
}
當我觸摸按鈕時,該功能不會觸發。 任何人都可以幫忙嗎? 我正在實際設備上對此進行測試(iPhone 6 Plus/iOS 8.1.1
要將動作添加到按鈕,您需要使用以下代碼
loginButton.addTarget(self,action:#selector(loginPressed),
forControlEvents:.TouchUpInside)
這段代碼對我來說很好用。 有關更多詳細信息,您可以按照此 [ 將參數附加到 Swift 中的 button.addTarget 操作
謝謝。
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