取消LongPressGesture

Question

我在取消UILongPressGesture时遇到问题。手势连接到按钮，当按下按钮时，avaudiorecorder开始录制音频。我想要在离开按钮时停止录音。感谢任何帮助，谢谢！

@IBAction func recordAudio(sender: AnyObject)
{
    if sender.state == UIGestureRecognizerState.Ended
    {
        session.setCategory(AVAudioSessionCategoryPlayback, error: nil)
        recorder.stop()
        recordButton.backgroundColor = UIColor.whiteColor()
        save()
    }
    else if sender.state == UIGestureRecognizerState.Began
    {
        session.setCategory(AVAudioSessionCategoryRecord, error: nil)
        recorder.record()
        recordButton.backgroundColor = UIColor.greenColor()
    }
    else if sender.state == UIGestureRecognizerState.Cancelled
    {
        recorder.stop()
        recordButton.backgroundColor = UIColor.redColor()
    }
}

编辑 - 取2

@IBAction func recordAudio(sender: UILongPressGestureRecognizer)
{
    switch (sender.state)
    {
        case .Ended:
            session.setCategory(AVAudioSessionCategoryPlayback, error: nil)
            recorder.stop()
            recordButton.backgroundColor = UIColor.whiteColor()
            save()
        case .Began:
            session.setCategory(AVAudioSessionCategoryRecord, error: nil)
            recorder.record()
            recordButton.backgroundColor = UIColor.greenColor()
        case .Cancelled, .Ended:
            recorder.stop()
            recordButton.backgroundColor = UIColor.redColor()
        default:
            break
    }   
}

编辑 - 取3（几乎那里）

@IBAction func recordAudio(sender: UILongPressGestureRecognizer)
{
    switch (sender.state)
    {
        case .Ended:
            session.setCategory(AVAudioSessionCategoryPlayback, error: nil)
            recorder.stop()
            recordButton.backgroundColor = UIColor.whiteColor()
            post()
        case .Began:
            session.setCategory(AVAudioSessionCategoryRecord, error: nil)
            recorder.record()
            recordButton.backgroundColor = UIColor.greenColor()
        case .Cancelled:
            recorder.stop()
            recordButton.backgroundColor = UIColor.redColor()
        case .Changed:
            let touchLocation = recordGesture.locationInView(recordButton)
            if (!CGRectContainsPoint(recordButton.bounds, touchLocation))
            {
                // touch is outside of button
                recorder.stop()
                recordButton.backgroundColor = UIColor.whiteColor()
                break
            }
        default:
            break
    }
}

此代码有效，唯一的问题是。手势发生变化后仍然会调用.Ended，我会从屏幕上释放手指。

Answer 1

当触摸长按手势识别器移动时，将使用状态UIGestureRecognizerStateChanged调用该功能。

我会改变你的代码......

@IBAction func recordAudio(sender: AnyObject)
{
    switch (sender.state) {
        case .Ended:
            session.setCategory(AVAudioSessionCategoryPlayback, error: nil)
            recorder.stop()
            recordButton.backgroundColor = .whiteColor()
            save()
        case .Began:
            session.setCategory(AVAudioSessionCategoryRecord, error: nil)
            recorder.record()
            recordButton.backgroundColor = .greenColor()
        case .Cancelled:
            recorder.stop()
            recordButton.backgroundColor = .redColor()
        case .Changed:
            // detect if the touch has gone outside of the button and stop the recording
        default:
            // do nothing
    }
}

用于检测触摸是否在按钮内

你可以这样做......

let touchLocation = recognizer.location(in: recordButton)

if !recordButton.bounds.contains(touchLocation) {
// touch is outside of button
}

未测试或任何其他内容。只需在Safari中徒手打字。