ios调用Html内JS alert 不能点击关闭为甚?

最新推荐文章于 2019-06-09 23:54:00 发布

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最新推荐文章于 2019-06-09 23:54:00 发布

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原文链接：http://www.cnblogs.com/ecmasea/p/7093099.html

本文探讨了iOS应用中使用WebView加载HTML页面时，遇到JS alert导致的死锁现象。通过分析发现，处理JS警报的线程与处理iOS警报视图的线程可能相互阻塞。为避免这一问题，文章提供了两种解决方案：一是使用JavaScript的setTimeout方法延时显示alert；二是让UIWebView触发UIAlertView而非依赖其处理JS警报。

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ios调用Html内JS alert 不能点击关闭为甚?

This question gave me the most insight to the problem...

Deadlock with GCD and webView

The gist is that the thread handling the JS from the stringByEvaluatingJavaScriptFromString: method and the thread handling the iOS alert view are probably blocking each other, making the "Close" button unresponsive.

My workaround is to defer the JS alert with a setTimeout, something like this...

NSString *jsMyAlert = @"setTimeout(function(){alert('FOOBAR');}, 1);";

[myWebView stringByEvaluatingJavaScriptFromString:jsMyAlert];To avoid any risk of deadlock, it might be better to have the UIWebView trigger an UIAlertView rather than rely on UIWebView to handle the JS alert. The workaround above would be suitable for most debugging purposes though.

转载于:https://www.cnblogs.com/ecmasea/p/7093099.html