iphone - WebView :shouldStartLoadWithRequest:navigationType: not getting called on webkit with youtube video link iphone

Question

我正在使用 webkit 在 iOS4 上显示 YouTube 视频。单击视频后，它应该自动启动播放器并显示视频，但实际情况是视频在播放器中渲染，但在 WebView 下。我想做的是使 webview 的 alpha 为 0 所以我使用委托(delegate)

      webView:shouldStartLoadWithRequest:navigationType:

但是当点击视频来启动它时，该代表不会被调用。否则，当第一个 webview 本身从 url 启动时，它就会被调用。

编辑

- (void)loadView {
[super loadView];

activityIndicatorView = [[ActivityIndicator alloc] init];

web = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
web.delegate = self;
NSString *videoUrl = @"http://www.youtube.com/watch?v=";
NSString *fullVdoUrl = [videoUrl stringByAppendingFormat:_videoUrl];

NSString *urlAddress = [NSString stringWithFormat:fullVdoUrl];   
NSURL *url = [NSURL URLWithString:urlAddress];           //Create a URL object.
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];            //URL Requst Object
[web loadRequest:requestObj];              //Load the request

[self.view addSubview:web];
[web release];

}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
[activityIndicatorView.view removeFromSuperview];
web.alpha = 1.0;
}

- (void)webViewDidStartLoad:(UIWebView *)webView {     
[self.view addSubview:activityIndicatorView.view];
}

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
web.alpha = 0.0;
return YES;
}

Answer 1

- (void)loadView {
[super loadView];

activityIndicatorView = [[ActivityIndicator alloc] init];

web = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
web.delegate = self;
NSString *videoUrl = @"http://www.youtube.com/watch?v=";
NSString *fullVdoUrl = [videoUrl stringByAppendingFormat:_videoUrl];

NSString *urlAddress = [NSString stringWithFormat:fullVdoUrl];   
NSURL *url = [NSURL URLWithString:urlAddress];           //Create a URL object.
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];            //URL Requst Object
[web loadRequest:requestObj];              //Load the request

[self.view addSubview:web];
[web release];

}

这里:

[self.view addSubview:web];

self.view 为 nil，将 view 添加到 nil 将不会保留您的 webview。

[网络发布];

您正在释放保留计数为 0 的 WebView。

尝试

self.view = web;
[web release];

这对你有用。