如何处理 iPhone 上的单点触摸和双点触摸

Question

我想做一些类似于 iPhone 的照片查看器的东西。单击时，UI 栏会在短暂延迟后消失。当您双击时，它会放大。但我不希望双击时发生任何事情，因为我还没有实现放大。

有人知道如何做到这一点吗？

[这篇文章]并没有真正帮助。除非你告诉我有必要子类化UIGestureRecognizer。然后，我想我可以弄清楚。有人有例子吗？

Answer 1

查看 UITapGestureRecognizer 文档。您需要查看两个属性：

• numberOfTapsRequired；和
• numberOfTouchesRequired

Answer 2

查看 Three20 的 PhotoView。它会做你想要做的事情。

Answer 3

下面是一些应该有帮助的代码：

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
[scrollView addGestureRecognizer:singleTap];
[singleTap release];

UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
[doubleTap setNumberOfTapsRequired: 2];
[scrollView addGestureRecognizer:doubleTap];
// this next line will hold callbacks to singleTap until enough time has gone by that doubleTap is not a possibility.  If a doubleTap happens, singleTap will not get called. Otherwise, singleTap's callback gets called.
[singleTap requireGestureRecognizerToFail:doubleTap];
[doubleTap release];