ios - 将 NSNotification 发布到新的 ViewController

Question

我有带有 5 个选项卡的选项卡式应用程序。

应用程序在索引为 0 的选项卡上启动

当我的应用程序收到推送通知时，我想在索引为 1 的选项卡中推送新的 View Controller 。

我的代码:

应用委托(delegate)

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)pushData {
    UITabBarController *tabb = (UITabBarController *)self.window.rootViewController;
    tabb.selectedIndex = 1;
    [[NSNotificationCenter defaultCenter] postNotificationName:@"pushImage" object:@"this is my item id from pushData"];
}

ProfileViewController(标签索引 1)

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(pushImage:) name:@"pushImage" object:nil];
}

-(void) pushImage: (NSNotification*) notification {
    NSString* text = notification.object;
    NSLog(@"My id from pushData: %@", text);
}

我的问题是 ProfileViewController 无法响应通知，因为初始化尚未完成，当 AppDelegate 触发通知时。

如果手动打开选项卡 1 并再次切换回选项卡 0，然后发布通知，它会完美响应。所以我需要在标签 1 加载后发布通知，我该如何处理？

我在 TabBarApplication 中从 AppDelegate 推送新 VC 的解决方案

    - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)pushData {    
            // ...... 

            if([[pushData objectForKey:@"type"] integerValue] == 0){
                // ....
            }
            else if([[pushData objectForKey:@"type"] integerValue] == 2){
                [self handleLikePush:pushData applicationState:application.applicationState];
            }
}

-(void)handleLikePush:(NSDictionary *)pushData applicationState:(UIApplicationState) applicationState{

    //..

    DetailImageViewController *detailImage = [[DetailImageViewController alloc] initWithImageId:imageId];
        [self pushViewControllerToCurrentTab:detailImage];
    }

}

- (void)pushViewControllerToCurrentTab:(UIViewController *)vc{

    UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
    UINavigationController *selectedTabNC = (UINavigationController *)tabBarController.selectedViewController;

    if (selectedTabNC != nil) {
        [selectedTabNC pushViewController:vc animated:YES];
    }
    else{
        NSLog(@"NavigationController not found");
    }    
}

Answer 1

您可以使用
addObserver:instanceOfOtherClass
而不是 addObserver:self
在 appDelegate 添加这些行:

ProfileViewController *pvController=[ProfileViewController new];
[[NSNotificationCenter defaultCenter] addObserver:pvController selector:@selector(pushImage:) name:@"pushImage" object:nil];

对这个方法

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)pushData {
      UITabBarController *tabb = (UITabBarController *)self.window.rootViewController;
      tabb.selectedIndex = 1;
      [[NSNotificationCenter defaultCenter] postNotificationName:@"pushImage" object:@"this is my item id from pushData"];

     //****   add here

     ProfileViewController *pvController=[ProfileViewController new];
    //[[NSNotificationCenter defaultCenter] addObserver:pvController selector:@selector(pushImage:) name:@"pushImage" object:nil];

    [[NSNotificationCenter defaultCenter] postNotificationName:@"pushIamge" object:pvController];// userInfo:[NSDictionary dictionaryWithObject:@"1,2,3,4,5" forKey:@"categories_ids"]]; 
}