有办法知道 UIPanGestureRecognizer 被取消的原因么？ - V2EX

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This topic created in 3772 days ago, the information mentioned may be changed or developed.

想用 UIPanGestureRecognizer 实现 modalView 下拉消失的动画。（类似 Apple Music 的播放页面）
但是在 handlePan 函数中通过 state 来实现动画的时候， state 是 began 之后，下一次就变成了 cancelled 了，而不是预想中的 changed 。
所以现在想看看是什么原因导致手势直接被取消了，请问怎么分析？

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State 动画 began modalview

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