Question

我试图在一堆动态生成的UIViews中为swift app中的所有四个方向实现swipeGestureRecognizer。基本上，我希望每个视图都能响应所有四个方向的滑动。这是我的代码

    import UIKit

class ViewController: UIViewController {



override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.


    //create a view to represent the main box
    let mainBox = UIView(frame: CGRectMake(0,0, 320, 40 ))
        mainBox.backgroundColor = UIColor.redColor()
        mainBox.layer.cornerRadius = 0
        mainBox.layer.borderWidth=1
        self.view.addSubview(mainBox) //Add the newly created view to the main view(self)





    //Create some UIViews on the fly

    for var i=0; i<8; ++i{
        //Add an image view
        let tile = UIImageView(frame: CGRectMake(CGFloat(i)*CGFloat(40),0,40,40 )) //Create a new view
        //Style the imageview
        tile.backgroundColor=UIColor.greenColor()
        tile.layer.cornerRadius=2
        tile.layer.borderWidth=1


        tile.userInteractionEnabled = true

        let swipeRight = UISwipeGestureRecognizer(target: self, action:Selector("tileRightSwiped:"))
        swipeRight.direction = .Right
        tile.addGestureRecognizer(swipeRight)


        let swipeLeft = UISwipeGestureRecognizer(target: self, action: Selector("tileLeftSwiped"))
        swipeLeft.direction = .Left
        tile.addGestureRecognizer(swipeLeft)


        let swipeDown = UISwipeGestureRecognizer(target: self, action: Selector("tileDownSwiped"))
        swipeDown.direction = .Down
        tile.addGestureRecognizer(swipeDown)


        let swipeUp = UISwipeGestureRecognizer(target: self, action: Selector("tileUpSwiped"))
        swipeUp.direction = .Up
        tile.addGestureRecognizer(swipeUp)











        mainBox.addSubview(tile) //Add the newly created view to mainBox


    }




}




override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}





//swipe gestures
func tileRightSwiped(gestureRecognizer: UISwipeGestureRecognizer){
    print("right swiped")
}

func tileLeftSwiped(gestureRecognizer: UISwipeGestureRecognizer){
    print("left swiped ")
}

func tileDownSwiped(gestureRecognizer: UISwipeGestureRecognizer){
    print("down swiped ")
}

func tileUpSwiped(gestureRecognizer: UISwipeGestureRecognizer){
    print("Up swiped ")
}




}

右滑动工作正常，但我无法理解为什么其他3个方向，应用程序意外中止，我得到这样的错误＆＃34; [myApp.ViewController tileDownSwiped]：无法识别的选择器发送到实例0x7fd230dbf5d0＆＃34;我错误地使用了swipegesture识别器，或者我的代码中的其他地方出了什么问题？我完全失败了。非常感谢任何帮助。

Answer 1

您添加到手势中的选择器是错误的，因为您错过了结尾的冒号。这就是你看到崩溃的原因。

您可能还需要向手势识别器添加代理并实施shouldRecognizeSimultaneouslyWithGestureRecognizer:，以便它们可以同时工作。

SwipeGestureRecognizer在swift中无法正常工作左，上，下

1 个答案: