ios - 从 safari 重定向到 IOS 中的 View Controller 后如何调用 viewWillAppear

Question

我在我的应用程序中使用 Flickr。当我单击 Flickr 按钮时，它会重定向到 safari 以使用 Flickr 和授权登录。

然后在成功授权后重定向到我的应用程序。但是在重定向之后我想调用 ViewWillAppear。我还设置了 <UIApplicationDelegate>在我看来。但它没有调用以下任何方法。

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

    NSLog(@"@@@@@@@@@@@@@@@@@@@@@Flickr Authorized is completed");
}
- (void)UIApplicationWillEnterForeground:(UIApplication *)application
{
    NSLog(@"@@@@@@@@@@@@@@@@@@@@@Flickr Authorized is completed at foreground");
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
    /*
     Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
     */
    NSLog(@"@@@@@@@@@@@@@@@@@@@@@Flickr Authorized is completed at become active");
}
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    NSLog(@"@@@@@@@@@@@@@@@@@@@@@@Flickr Authorized is completed at openURL");
}
-(void)viewWillAppear:(BOOL)animated
{
    NSLog(@"@@@@@@@@@@@@@@@@@@@@@Flickr Authorized is completed at viewWillAppear");

    [super viewWillAppear:YES];
}

但在 AppDelegate 从 safari 重定向后调用 Below 方法。我使用了 SnapAndRun flickr 示例中的代码。

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    NSLog(@"@@@@@@@@@@@@@@@@@@@@@@Call Back Here@@@@@@@@@@@");

    if ([self flickrRequest].sessionInfo)
    {
        // already running some other request
        NSLog(@"Already running some other request");
    }
    else {
        NSString *token = nil;
        NSString *verifier = nil;
        BOOL result = OFExtractOAuthCallback(url, [NSURL URLWithString:SRCallbackURLBaseString], &token, &verifier);

        if (!result) {
            NSLog(@"Cannot obtain token/secret from URL: %@", [url absoluteString]);
            return NO;
        }

        [self flickrRequest].sessionInfo = kGetAccessTokenStep;
        [flickrRequest fetchOAuthAccessTokenWithRequestToken:token verifier:verifier];
        [activityIndicator startAnimating];
        //[viewController.view addSubview:progressView];
    }

    return YES;
}

我知道我们可以在这里调用我的 View Controller 方法。但是在我的 View 本身重定向后，是否有任何替代方法可以调用默认委托(delegate)方法。

任何建议将不胜感激。提前致谢。

Answer 1

您可以使用通知中心。

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(someMethod:) name:@"UIApplicationDidBecomeActiveNotification"object:nil];