ios - UIWebView 没有立即停止

Question

我已经尝试了所有这些(one、two、three、four)解决方案，但是在我从 Web View 屏幕返回到之前的 viewController 后，它卡住了大约 2 秒(有时更多) . viewWillAppear 中没有任何东西会导致卡住。

这是 WebView Controller 的viewWillDisappear:

-(void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [detailWebView stopLoading];
    detailWebView.delegate = nil;
    NSLog(@"viewWillDisappear called !!!");
}

第一个 View Controller :

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self.navigationController.navigationBar setBarTintColor:[UIColor colorWithRed:41.0/255.0 green:151.0/255.0 blue:132.0/255.0 alpha:1.0]];
    UIImage *imagePlus = [[UIImage imageNamed:@"create.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    buttonCreate = [UIButton buttonWithType:UIButtonTypeCustom];
    [buttonCreate setImage:imagePlus forState:UIControlStateNormal];
    [buttonCreate addTarget:self action:@selector(createActivity:) forControlEvents:UIControlEventTouchUpInside];
    buttonCreate.frame = CGRectMake(self.view.frame.size.width - 40, 10, 16, 16);
    [self.navigationController.navigationBar addSubview:buttonCreate];
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"back", nil) style:UIBarButtonItemStylePlain target:nil action:nil];
    [backButton setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor blackColor]} forState:UIControlStateNormal];
    self.navigationItem.backBarButtonItem = backButton;
    [self.navigationController.navigationBar setTintColor:[UIColor blackColor]];
}

更新:我刚刚确认如果我让 webView 完全加载然后转到之前的 viewController，则不会观察到卡住。

Answer 1

我执行以下操作，这与@Mrunal 建议的操作类似，但加载了一个有效页面。我最初添加这个是为了处理加载页面的计时器在从 UIWebView 弹出后继续永远运行的情况。对我来说，这很管用。

- (void) viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    // Load a blank page as found things hang around.
    [self.theWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"about:blank"]]];
}

注意我没有调用 stopLoading 因为它会停止加载请求。这可能是 Mrunal 解决方案的问题所在？