如何在加载URL期间使用progressView？

Question

我想在我的网址加载时使用progressView。我该怎么办？

这是我的.m代码：

-(void)openURL{
UIWebView *webView = [[UIWebView alloc] init];
[webView setFrame:CGRectMake(0, 0, 320, 460)];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://google.com"]]];
[[self view] addSubview:webView];
}

- (IBAction)goto:(id)sender {


[self openURL];
}

Answer 1

实施UIWebViewDelegate，具体为：

-(void)openURL{
    UIWebView *webView = [[UIWebView alloc] init];
    webView.delegate = self;
    // ... rest of method as above ...
}

- webViewDidStartLoad:(UIWebView *)webView {
    // Start progress.
}

- webViewDidFinishLoad:(UIWebView *)webView {
    // Stop progress.
}

Answer 2

你可以做这样的事情

[progressView startAnimating];

dispatch_async(dispatch_get_main_queue(), ^{
    [webView loadRequest:yourRequest];

    [progressView stopAnimating];
    [progressView removeFromSuperView];
}

这将在操作开始之前启动进度视图，并在完成时停止并将其删除。