如何在iPhone上处理单点击和双点点击

Question

我想做类似iPhone的照片浏览器。单击时，UI栏会在短暂延迟后消失。双击时，它会放大。但我不想在双击时发生任何事情，因为我还没有实现放大。

任何人都知道怎么做？

[这篇文章]并没有真正帮助。除非你告诉我有必要继承UIGestureRecognizer。然后，我想我可以搞清楚。有人有任何例子吗？

Answer 1

查看UITapGestureRecognizer文档。您想要查看两个属性：

• numberOfTapsRequired;和
• numberOfTouchesRequired

Answer 2

查看Three20的PhotoView。它会做你想做的事。

Answer 3

以下是一些应该有用的代码：

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];