Question

我正在制作一个受iOS8语音消息启发的应用程序，并尝试添加“手势和动画”（例如向左滑动并取消记录，向右滑动以上传语音记录。）但它根本不起作用。以下是下面的代码段。

    // Swipe left and cancel
    let swipeLeftGesture = UISwipeGestureRecognizer(target: self, action: "swipeLeftCancel")
    swipeLeftGesture.direction = UISwipeGestureRecognizerDirection.Left
    self.view.addGestureRecognizer(swipeLeftGesture)

    // Swipe right and upload
    let swipeRightGesture = UISwipeGestureRecognizer(target: self, action: "swipeRightUpload")
    swipeRightGesture.direction = UISwipeGestureRecognizerDirection.Right
    self.view.addGestureRecognizer(swipeRightGesture)
    session.requestRecordPermission({(granted: Bool)-> Void in
        if granted {
            self.setupRecorder()
        } else {
            println("Permission to record not granted")
        }
    })

   func swipeLeftCancel(sender: UISwipeGestureRecognizer) {
    // slide left and cancel
   }

   func swipeRightUpload(sender: UISwipeGestureRecognizer) {
    // slide right and upload
    )

整个代码（在添加UISwipeGestureRecognizer之前）在这里ー＆gt; https://github.com/chansuke/GoForIt

有人给出一些建议吗？

Answer 1

您的操作选择器应命名为swipeLeftCancel:和swipeRightUpload:：

let swipeLeftGesture = UISwipeGestureRecognizer(target: self, action: "swipeLeftCancel:")

最后的冒号是必要的，因为你的函数接受参数sender。这是因为在Objective-C中，您的方法将声明为- (void)swipeLeftCancel:(id)sender，其选择器将为swipeLeftCancel:。在Swift中，这意义不大，但它只是你在使用选择器时必须记住的东西。

Answer 2

//添加手势：

    let swipeLeftGesture = UISwipeGestureRecognizer(target: self, action:"swipeLeft")
    swipeLeftGesture.direction = UISwipeGestureRecognizerDirection.Left
    self.view.addGestureRecognizer(swipeLeftGesture)

swipeLeft是您在Gesture动作中触发的选择器。

在Swift中添加手势和动画

2 个答案: