在UIScrollView中向标准Pan Gesture Recognizer添加功能

问题描述

我正在尝试跟踪手指在 UIScrollView 中的位置。
我有 UIScrollView （见下文），但不幸的是我添加的手势识别器覆盖了标准的手势识别器。

I am trying to keep track of where a finger is in a UIScrollView.I have subclassed UIScrollView (see below) but unfortunately the gesture recognizer that I am adding is overriding the standard one.

结果我得到 NSLog（@Pan）可以工作，但不幸的是视图不再滚动了。

As a result I get NSLog(@"Pan") to work but unfortunately the view doesn't scroll anymore.

如何让两个手势识别器同时工作？

How can I get both gestures recognizers to work at the same time?

谢谢。

- (void)viewDidLoad:(BOOL)animated
{
    [super viewDidLoad:animated];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    [scrollView addGestureRecognizer:panRecognizer];
}


- (void)pan:(id)sender {
    NSLog(@"Pan");
}

推荐答案

编辑：这种方法有效！您只需要尽快设置 canCancelContentTouches （我在 viewDidLoad 中设置）。

EDIT: this method works! You just need to set canCancelContentTouches as soon as possible (I do it in viewDidLoad).

原始答案：我尝试了一种新的方法，但不幸的是它没有完全发挥作用。

ORIGINAL ANSWER: I have tried a new approach but unfortunately it doesn't fully work.

添加手势识别器我正在继承 UIScrollView 并编写我自己的 touchesBegan ， touchesMoved 等方法。

Instead of adding a gesture recognizer I am subclassing the UIScrollView and writing my own touchesBegan, touchesMoved, etc methods.

这样我知道用户在哪里触摸但不幸的是PanGestureRecognizer正在触发 touchesCancelled 每次我开始滚动，即使将 canCancelContentTouches 设置为NO 。

This way I know where the user is touching BUT unfortunately the PanGestureRecognizer is triggering touchesCancelled every time I start to scroll even after setting the canCancelContentTouches to NO.

有人知道为什么吗？我还找到了。

Does anybody know why? I have also found this.

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