UIGestureRecognizer - 检测点击和拖动，如触控板 [英] UIGestureRecognizer - detecting tap and drag like trackpad

问题描述

有没有办法级联UIGestureRecognizers来检测点击然后拖动。
例如，我想检测用户何时点击然后拖动他的手指。

Is there any way to cascade UIGestureRecognizers to detect a tap and then drag. For example, I want to detect when the user taps and then drags his finger around.

这类似于在触控板上拖动的方式。

This would be similar how drag works on trackpads.

所以我想检测一下水龙头，然后我想让UIPanGestureRecognizer给我发送连续更新。

So I want to detect a tap, then I want to get UIPanGestureRecognizer to send me continuous updates.

我想要使用标准的UIGesture类来创建这个新手势，而不是使用原始触摸创建我自己的手势。

I want to use standard UIGesture classes to create this new gesture instead of creating my own using raw touches.

这是否可能？

推荐答案

虽然我没有按照预期的方式找到解决方案，但我找到了更好的解决方案。

although i haven't found the solution the way i expected, i found a better solution.

仅仅使用 UILongPressGrstureRecognizer ，令人惊讶的是它能够实现点击和拖动。

By just using UILongPressGrstureRecognizer, it is surprising that it is able to implement tap and drag.

你必须：

1. 将numberOfTapsRequired设置为1以检测初始点击。


2. 将minimumDuration设置得更小以更快地检测拖动无需等待

例如：

UILongPressGestureRecognizer *mouseDrag = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleDrag:)];
mouseDrag.numberOfTapsRequired=1;
mouseDrag.minimumPressDuration=0.05;
[clickLeft requireGestureRecognizerToFail:mouseDrag];

要处理拖拽，你必须确定处理它的状态作为连续手势。

to handle the drag, you must determine the state to handle it appropriately as a continuous gesture.

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