将一些数据传回给RootViewController iOS 7 [英] Passing some data back to RootViewController iOS 7

问题描述

假设我们在我们的 UINavigationController 中有3个ViewController，名为ViewControllerA，ViewControllerB，ViewControllerC。具体来说，ViewControllerA是 RootViewController ，并且ViewControllerB和ViewControllerC被推送到其上。所以，目前ViewControllerC在顶部，用户可以看到。

我想通过调用返回到ViewControllerA [self.navigationController popToRootViewControllerAnimated：YES] ; 方法，并从这里传递一些数据到ViewControllerA。我必须根据ViewControllerC传递的数据更新一些UI。

如果我不得不从ViewControllerB返回数据，那么我可以实现自定义协议/委托。但是在上述情况下可以做些什么好处？

提前感谢您的帮助。

解决方案

您可以尝试NSNotificationCenter如下所示，

示例：

在您的ViewControllerA.m中

   - （void）viewDidLoad 
 {
 [[NSNotificationCenter defaultCenter] addObserver： self selector：@selector（dataReceived :) name：@passDataobject：nil]; 
} 
 
  - （void）dataReceived：（NSNotification *）noti 
 {
 NSLog（@dataReceived：％@，noti.object）; 
} 
  

在您的ViewControllerC.m中

   - （void）gotoHome 
 {
 [[NSNotificationCenter defaultCenter] postNotificationName：@passData对象：[NSDictionary dictionaryWithObject：@Sample DataforKey ：@dataDic]]; 
 
 [self.navigationController popToRootViewControllerAnimated：YES]; 
} 
  

谢谢！

Suppose , We have 3 ViewControllers called ViewControllerA , ViewControllerB , ViewControllerC in our UINavigationController. To be specific , ViewControllerA is the RootViewController and ViewControllerB and ViewControllerC are pushed on it. So, Currently ViewControllerC is on the Top and visible to user.

I want to return to ViewControllerA by calling [self.navigationController popToRootViewControllerAnimated:YES]; method and pass some data to ViewControllerA from here. I have to update some UI according to the data passed from ViewControllerC.

If I had to return data from ViewControllerB , then I could implement custom protocol/delegate. But what can be a good approach in the situation described above ?

Thanks in advance for your help.

解决方案

You can try NSNotificationCenter as shown below,

Example:

In your ViewControllerA.m

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

-(void)dataReceived:(NSNotification *)noti
{
    NSLog(@"dataReceived :%@", noti.object);
}

In your ViewControllerC.m

-(void)gotoHome
{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"passData" object:[NSDictionary dictionaryWithObject:@"Sample Data" forKey:@"dataDic"]];

    [self.navigationController popToRootViewControllerAnimated:YES];
}

Thanks!

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