UIWebView stringByEvaluatingJavaScriptFromString hangs on iOS5.0/5.1 when called using GCD

Question

I have the following code in viewDidLoad, which works properly on iOS 4.3, but it hangs on iOS 5/5.1. On iOS 5/5.1, the alert dialog is shown but can not be dis

Answer 1

After test, I consider it as a Bug, and changing code to use

[webView performSelectorOnMainThread:@selector(stringByEvaluatingJavaScriptFromString:) withObject:js waitUntilDone:NO]

will solve it.