Question

我有一个标签栏应用程序，其中一个按钮将网页内容加载到UIWebView。我面临的问题是，当尝试获取数据的连接时，标签栏按钮无响应，直到页面完成加载或连接失败。是否有更好的方法来执行此操作，以便用户可以在他/她改变主意时切换出该选项卡。谢谢，这是代码：

- (void)loadThrillsSite
{
    [self.webView setDelegate:self];
    NSString *urlString = @"https://www.Thrills.in";
    NSURL *url = [NSURL URLWithString:urlString];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    NSOperationQueue *queue = [[NSOperationQueue alloc] init];

    [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
     {
         if ([data length] > 0 && error == nil) [self.webView loadRequest:request];
         else if (error != nil) {
             UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Connection Error!" message:@"Failed to connect to server\nPlease check your internet connection and try again" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
             [alert show];
         }
     }];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView;
{
    [hudImageView removeFromSuperview];

    [self.spinner stopAnimating];

    [patternView removeFromSuperview];
}

Answer 1

UIWebView的loadRequest方法说明：

通过启动异步客户端请求连接到给定的URL。

它已经进行了异步调用，因此您不需要使用其他块。只需致电[self.webView loadRequest:request];即可处理- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error方法的错误。

其他说明：您的网址目前无法正常工作，也不会执行任何与UI相关的工作，例如在后台线程上显示警报视图。希望它有所帮助。

- (void)loadThrillsSite
{
    [self.webView setDelegate:self];
    NSString *urlString = @"https://www.Thrills.in";
    NSURL *url = [NSURL URLWithString:urlString];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    [self.webView loadRequest:request];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView;
{
    [hudImageView removeFromSuperview];

    [self.spinner stopAnimating];

    [patternView removeFromSuperview];
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Connection Error!" message:@"Failed to connect to server\nPlease check your internet connection and try again" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    [alert show];
}

当NSUrlSendAssynchronousrequest操作运行时，选项卡栏应用程序按钮被阻止

1 个答案: