iOS UIScrollView setScrollEnabled 失败
在 iOS5 中，这工作正常：
[descriptionWebView.scrollView setScrollEnabled:NO];
但在任何低于 5 的 iOS 中，它都会失败：
[UIWebView scrollView]: unrecognized selector sent to instance 0x791f9e0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIWebView scrollView]: unrecognized selector sent to instance 0x791f9e0'
In iOS5 this works fine:
[descriptionWebView.scrollView setScrollEnabled:NO];
But in any iOS under 5 it fails with:
[UIWebView scrollView]: unrecognized selector sent to instance 0x791f9e0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIWebView scrollView]: unrecognized selector sent to instance 0x791f9e0'
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问题不在于
setScrollEnabled:调用。实际上，UIWebView的scrollView直到 iOS 5 才公开（这就是它在其他方面失败的原因）。请参阅UIWebView文档以获取更多信息。在以前版本的 iOS 中，您必须 诉诸子视图的迭代 的
UIWebView来查找UIScrollView。The issue isn't the
setScrollEnabled:call. It's actually that thescrollViewof theUIWebViewwasn't exposed until iOS 5 (which is why it fails on anything else). See theUIWebViewdocumentation for further information.In previous versions of iOS, you had to resort to iterating through the subviews of your
UIWebViewto find aUIScrollView.你可以做这种测试，不需要你检查它是哪个iOS版本。
You can do this kind of test which doesn't require you to check which iOS version it is.