如何检测手势与捏出手势的捏？ [英] How to detect pinch in gesture vs pinch out gesture?

问题描述

而不是缩放，我认为通常会使用捏合手势，我只是想检测是否捏是捏缩进，因此我可以折叠或扩展一些表格部分。我该怎么做？

Instead of scaling, which I think pinch gesture is usually used for, I am looking to just detect whether the pinch was a pinch in vs pinch out so I can collapse or expand some table sections. How would I go about doing that?

推荐答案

嗯，这看起来很简单。 UIPinchGestureRecognizer 类只有两个属性， scale 和 velocity 。似乎合乎逻辑的是，负比例意味着向内捏合，正向比例向外捏合。

Well, that seems an easy one. The UIPinchGestureRecognizer class has only two properties, scale and velocity. It seems logical that a negative scale would mean an inward pinch, a positive scale an outward pinch.

注意：否定可能会产生误导。 较小是 0.0<规模< 1.0 ，更大是 scale> 1.0 。

NB: "negative" might be misleading. "Smaller" is 0.0 < scale < 1.0, "bigger" is scale > 1.0.

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