iphone - 让 UIWebView 正确加载 CGRect

Question

我试图让我的 webView 在我设置的 CGRect 框架中正确加载，同时运行 activityIndi​​cator。

当我设置它[self.view addSubview:webView]; 但没有出现活动指示器时，它可以正确加载。当我用activityindicator设置它时，webView.delegate = self;确实出现了，但是webview在加载时会覆盖整个屏幕。我在顶部有一个分段条，然后被掩盖。

- (void)viewDidLoad {
    [super viewDidLoad];

    CGRect webFrame = CGRectMake(0.0, 50.0, 320.0, 318.0);

    activityIndicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    [self.view addSubview:activityIndicator];
    activityIndicator.frame = CGRectMake(250, 250, 30.0, 30.0);
    self.view.center = CGPointMake(160.0f, 190.0f);
    activityIndicator.center = self.view.center;

    webView = [[UIWebView alloc] initWithFrame:webFrame];

    [webView setBackgroundColor:[UIColor whiteColor]];
    NSString *urlAddress = @"http://www.google.com";
    NSURL *url = [NSURL URLWithString:urlAddress];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
    [webView loadRequest:requestObj];
    webView.delegate = self;
//  [self.view addSubview:webView]; 
}

- (void)webViewDidStartLoad:(UIWebView *)webView {
    NSLog(@"activity started");
    [activityIndicator startAnimating];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSLog(@"activity stopped");
    [activityIndicator stopAnimating];
    self.view = webView;
}

Answer 1

它应该是

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSLog(@"activity stopped");
    [activityIndicator stopAnimating];
    [[self view]  addSubView:webView];
}

视图没有被覆盖，它们是通过重置视图属性从层次结构中删除的。