iOS 5 UIWebview委托：WebKit在webView中丢弃了未捕获的异常：decisionPolicyForNavigationAction [英] iOS 5 UIWebview Delegate: WebKit discarded an uncaught exception in the webView:decidePolicyForNavigationAction

问题描述

我正在使用委托方法 shouldStartLoadWithRequest 来捕获链接点击并处理我的应用内的特定情况，而不是允许 webView 导航到该链接。在这段代码中，我试图将一个新的 ViewController 推送到堆栈中。在尝试推送视图后，我立即在控制台中发生以下消息崩溃：

I am using the delegate method shouldStartLoadWithRequest to catch link clicks and handle specific cases inside my app instead of allowing the webView to navigate to the link. In this code, I am attempting to push a new ViewController onto the stack. Immediately after the attempt to push the view, I get a crash with the following message in my console:

WebKit discarded an uncaught exception in the webView:decidePolicyForNavigationAction:request:frame:decisionListener: delegate:

我的代码如下所示：

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    if(decision logic){
        MyViewController *vc = [[MyViewController alloc] init];
        [self.navigationController pushViewController:vc animated:YES];
        [vc release];
        return NO;
    }

    return YES;
}

我也试过使用模态而不是推新的的viewController 。我得到了相同的结果。我还应该在这里处理其他任何情况吗？

I have also tried using a modal instead of pushing a new viewController. I get the same result. Is there any other scenarios I should be handling here?

**编辑：想到这一点。我想要推送的视图包含另一个 UIWebView 。在转换之前，我应该对第一个 webView 做些什么吗？我只是测试推送一个不包含 webView 的不同视图控制器，它运行正常。

** Just thought of this. The view I'm trying to push contains another UIWebView. Should I be doing something to the first webView before transitioning? I just testing pushing a different view controller that doesn't contain a webView and it worked fine.

推荐答案

我通过确保在继续之前停止webview上的所有先前请求来解决此问题：

I fixed this by ensuring that all previous requests on the webview were stopped before continuing:

[webview stopLoading];

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