UIGestureRecognizer requireGestureRecognizerToFail 场景
我正在为非 iOS 平台编写一个多点触控手势识别库，但 UIGestureRecognition 和所有这些概念似乎相当可靠，所以在某种程度上我使用它作为参考。
我不清楚一件事： requireGestureRecognizerToFail 方法。除了单击两次三连击之外，任何人都可以指出一些潜在的用例吗？我确实理解它的目的，甚至编写了这种实现，但最终完全删除了这个东西。因为恕我直言，代码有点味道（如果您尝试将其包含在基本手势识别类中，即使它在双击场景中完美工作）。对我来说，使用额外的几行代码来解决单双击情况（一旦您真正拥有它）似乎更干净，而不是将这个非常具体的东西包含到基本手势类中......但也许我错过了其他一些场景？你遇到过吗？
好的，所以我意外地发现了另一个用例：在 UIScrollView 上滑动（滑动平移手势识别器需要滑动才能失败）developer.apple.com/videos/wwdc/2011/?id=104 min30。
是我的问题太不清楚了，还是这里的 i 开发人员不多？
I'm writing a multitouch gesture recognition library for non-iOS platform, but UIGestureRecognition and all that concept seems pretty solid, so in some way I use it as a reference.
One thing is unclear for me: the requireGestureRecognizerToFail method. Can anyone point on some any potential use-cases other then double-triple-n-tap over single tap? I do understand it's purpose and even wrote that kind of implementation, but eventually removed this thing entirely. Because IMHO the code smells a bit (if you try to include it in base gesture recognition class, even though it works perfectly with doubletap-tap scenario). For me it seems much cleaner to have an extra couple lines of code to workaround single-doubletap situation (once you actually have it), rather then include this very specific thing into base gesture class... But maybe I miss some other scenarios? Have you met any?
OK, so I accidently found another use-case: Swipe on UIScrollView (swipe pan gesture recognizer requires swipe to fail) developer.apple.com/videos/wwdc/2011/?id=104 min30.
Was my question so unclear, or here's not many i-developers?
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