iOS Tap手势状态开始未命中

问题描述

我使用点击手势识别器使视图可点击，效果很好。但是我想突出显示发生触摸时的视图，并在触摸结束时将其删除。

I have made a view clickable with a tap gesture recognizer, which is working just fine. But I want to highlight the view when the touch happens en remove it when the touch ended.

我已经尝试过：

- (IBAction)refresh:(UITapGestureRecognizer *)sender {
    if(self.currentStatus == NODATA){
        if(sender.state == UIGestureRecognizerStateBegan){
            NSLog(@"Began!");
            [self.dashboardViewController.calendarContainer state:UIViewContainerStatusSELECTED];
        }
        if (sender.state == UIGestureRecognizerStateEnded){
             NSLog(@"%@", @"Ended");
            [self.dashboardViewController.calendarContainer state:UIViewContainerStatusNORMAL];
        } 
        [self setState:REFRESHING data:nil];
    }
}

显示 Ended do的NSLog，但是没有开始，所以它永远不会进入选定状态。为什么会这样？

The NSLog of "Ended does" get displayed but the began didn't so it never goes into selected. Why is this?

推荐答案

UITapGestureRecognizer 将永远不会进入 UIGestureRecognizerStateBegan 状态。对于他们的识别器，只有连续手势（如滑动或捏）会从 UIGestureRecognizerStatePossible 变为 UIGestureRecognizerStateBegan 。 离散手势（例如轻击）将其识别器直接放置到 UIGestureRecognizerStateRecognized 中，即单击一次，直接放入 UIGestureRecognizerStateEnded 。

UITapGestureRecognizer will never go in the UIGestureRecognizerStateBegan state. Only continuous gestures (such as a swipe or a pinch) will result for their recognizers going from UIGestureRecognizerStatePossible to UIGestureRecognizerStateBegan. Discrete gestures, such as a tap, put their recognizers directly into UIGestureRecognizerStateRecognized, i.e. for a single tap, right into UIGestureRecognizerStateEnded.

也就是说，也许您正在寻找 UILongPressGestureRecognizer 一个连续的识别器，它将输入 UIGestureRecognizerStateBegan ，从而使您能够识别触摸的开始和结束？

That said, maybe you're looking for a UILongPressGestureRecognizer, which is a continuous recognizer that will enter UIGestureRecognizerStateBegan, allowing you to discern beginning and end of touch?

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