检查是否已加载UIWebView

问题描述

我在一个选项卡中有一个UIWebView加载到viewDidLoad中，但是如果用户点击其他选项卡，加载将被中断并且
- （void）webView：（UIWebView *）webView didFailLoadWithError： （NSError *）错误将被调用，但我想知道如果用户再次点击上一个标签时如何检查是否加载了webView，如果没有加载它将重新加载它，类似这样的

I have an UIWebView in one tab that loads in viewDidLoad, but if user taps other tab the loading will be disrupted and - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error will be called, but I want to know how can check if webView is loaded if user taps the previous tab again, and if it's not loaded it will reload it, something like this

  -(void)viewWillAppear:(BOOL)animated
{
    if (!webView)
        {
          NSURL *url = [NSURL URLWithString:@"url"];
          NSURLRequest *request = [NSURLRequest requestWithURL:url];
          [webView loadRequest:request];
        }

    }

但它不起作用，请帮忙？

But it's not working, help please?

推荐答案

UIWebview有一个webViewDidFinishLoad委托方法。设置一个bool来表明这已经完成。

UIWebview has a webViewDidFinishLoad delegate method. Set a bool to indicate this was done.

- (void)webViewDidStartLoad:(UIWebView *)webView {

 webViewDidFinishLoadBool = NO;
 loadFailedBool = NO;

}


- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {

 loadFailedBool = YES;
}


- (void)webViewDidFinishLoad:(UIWebView *)webView {

   if (!loadFailedBool)
   webViewDidFinishLoadBool = YES;

}

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