当使用GCD调用时，UIWebView stringByEvaluatingJavaScriptFromString在iOS5.0 / 5.1上挂起 [英] UIWebView stringByEvaluatingJavaScriptFromString hangs on iOS5.0/5.1 when called using GCD

问题描述

我在 viewDidLoad 中有以下代码，它在iOS 4.3上正常运行，但它挂在iOS 5 / 5.1上。在iOS 5 / 5.1上，显示警告对话框但无法解除，UI线程冻结，无法单击确定按钮。

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 dismissed, the UI thread freezes, the OK button just can not be clicked.

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    dispatch_sync(dispatch_get_main_queue(), ^{
        [self.webview stringByEvaluatingJavaScriptFromString:@"alert('HELLO WORLD!')"];
    });
});

这是一个错误吗？

推荐答案

经过测试，我认为它是一个Bug，并且更改代码使用

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

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

将解决它。

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