ios – UIPanGestureRecognizer：识别对象是否固定在某个区域并且手势识别器状态未结束

2024年1月14日 376次阅读

我正在使用UIPanGestureRecognizer识别对象的拖动运动,它适用于以下状态：

UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
[panGesture setMaximumNumberOfTouches:1];
[panGesture setDelegate:self];
[self.view addGestureRecognizer:panGesture];
[panGesture release];

- (void)panAction:(UIPanGestureRecognizer *)gR 
{
    switch (gR.state) 
    {       
        case UIGestureRecognizerStateBegan:
            NSLog(@"drag began");
            break;

        case UIGestureRecognizerStateChanged:
            NSLog(@"drag moved");
            break;

        case UIGestureRecognizerStateEnded:
            NSLog(@"drag ended");
            break;

        default:
            break;
    }
}

现在我的问题是,是否有可能检测到用户开始拖动对象的情况,并且在某些时候已停止拖动并将对象保持在固定点？我已经检查过,当用户停止移动对象时,它停止记录“已更改”,直到用户开始移动对象或释放它(在这种情况下,它记录“已结束”).
这是一个示例日志：

2013-02-19 16:36:**01.181** Project[24201:10a03] drag began
2013-02-19 16:36:**14.004** Project[24201:10a03] drag moved
2013-02-19 16:36:14.221 Project[24201:10a03] drag moved
2013-02-19 16:36:**14.894** Project[24201:10a03] drag ended

您可以看到在开始,更改和结束之间存在一些暂停(那时对象被固定在一个点上).是否有可能发现这种情况？如果是这样,怎么样？
任何帮助都将得到诚挚的感谢,提前谢谢.

更新

我试过UILongPressGestureRecognizer：

UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPressGesture:)];
[longPressGesture setDelegate:self];
[self.view addGestureRecognizer:longPressGesture];
[longPressGesture release];

-(void)handleLongPressGesture:(UILongPressGestureRecognizer *)gR
{
    switch (gR.state)
    {
        case UIGestureRecognizerStateBegan:
            NSLog(@"long press began");
            break;

        case UIGestureRecognizerStateCancelled:
            NSLog(@"long press cancelled");
            break;

        case UIGestureRecognizerStateEnded:
            NSLog(@"long press ended");
            break;

        default:
            break;
    }
}

还有委托方法：

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

现在,两个识别器都是单独识别的.如果首先执行长按手势,则同时识别两个手势：

2013-02-19 17:19:13.382 Project[24357:10a03] long press began
2013-02-19 17:19:14.901 Project[24357:10a03] drag began
2013-02-19 17:19:14.937 Project[24357:10a03] drag moving
2013-02-19 17:19:15.025 Project[24357:10a03] drag moving
2013-02-19 17:19:16.317 Project[24357:10a03] long press ended
2013-02-19 17:19:16.317 Project[24357:10a03] drag ended

但是如果首先执行拖动手势,除非拖动结束,否则它不再识别长按：

2013-02-19 17:21:05.985 Project[24357:10a03] drag began
2013-02-19 17:21:06.001 Project[24357:10a03] drag moving
2013-02-19 17:21:06.018 Project[24357:10a03] drag moving
2013-02-19 17:21:**06.052** Project[24357:10a03] drag moving
2013-02-19 17:21:**17.786** Project[24357:10a03] drag moving
2013-02-19 17:21:17.818 Project[24357:10a03] drag moving
2013-02-19 17:21:17.851 Project[24357:10a03] drag moving
2013-02-19 17:21:19.324 Project[24357:10a03] drag ended
2013-02-19 17:21:20.388 Project[24357:10a03] long press began
2013-02-19 17:21:21.188 Project[24357:10a03] long press ended

拖动开始后我需要第二种情况来检测长按.

最佳答案 您可以在UIGestureRecognizerStateChanged之后安排NSTimer,如果它存在则使其失效,然后在计时器的选择器中执行任何操作.

if(self.myTimer)
     [self.myTimer invalidate];
self.myTimer = [NSTimer scheduledTimerWithTimeInterval:PAUSE_INTERVAL target:self selector:@selector(userPaused:) userInfo:nil repeats:NO];
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