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我这里有一个应用程序，它加载一个包含相机按钮的模态视图（WebView）。问题是，当网页还没有完全加载时，我按下相机按钮并关闭它，然后我有一个白屏，分别是网站在加载时被中断。

因此，只要网页正在加载，我就想让相机按钮“处于非活动状态”。我怎样才能做到这一点？这是我的实际代码：

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
if ([viewController isKindOfClass:[ATWebViewController class]]) {
    NSURL *url = nil;
    if (viewController.tabBarItem.tag == 0) {
        url = [NSURL URLWithString:@"http://m.bikemarkt.mtb-news.de"];
    }
    else if (viewController.tabBarItem.tag == 1) {
        url = [NSURL URLWithString:@"http://winterpokal.mtb-news.de"];
    }

// 如果 viewController.tabBarItem.tag==0 ATWebViewController *webViewController = [[ATWebViewController alloc] initWithNibName:nil bundle:nil URL:url ];

    //Check if the device is running iOS 6.x.x and if yes, then show the camera button

    if ([[[UIDevice currentDevice] systemVersion] hasPrefix:@"5"]) {

    UINavigationController *navigationBarController = [[UINavigationController alloc] initWithRootViewController:webViewController];

    navigationBarController.navigationBar.tintColor = ATNavigationBarTintColor;

    if (viewController.tabBarItem.tag == 0) {

    webViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissWebView)];
        }

     else if (viewController.tabBarItem.tag == 1) {

    webViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissWebView)];
         }

    navigationBarController.modalPresentationStyle = UIModalPresentationFullScreen;
    [self presentModalViewController:navigationBarController animated:YES];
    return NO;
        }

    // If not iOS 5

    else

        { UINavigationController *navigationBarController = [[UINavigationController alloc] initWithRootViewController:webViewController];

        navigationBarController.navigationBar.tintColor = ATNavigationBarTintColor;

        if (viewController.tabBarItem.tag == 0) {

            webViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissWebView)];
            webViewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(TakePhoto)];
        }

        else if (viewController.tabBarItem.tag == 1) {

            webViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissWebView)];
        }

        navigationBarController.modalPresentationStyle = UIModalPresentationFullScreen;
        [self presentModalViewController:navigationBarController animated:YES];
        return NO;
    }


}
return YES;

}

@结尾

任何帮助将不胜感激...... :)

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1 回答 1

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webViewDidFinishLoading:从UIWebViewDelegate协议实现

只有在那里设置按钮拍照，而不是马上

于 2013-05-12T11:20:15.623 回答