如何将数据从一个视图传回到IOS中的其他视图？ [英] How to pass data back from one view to other View in IOS?

问题描述

我可以毫无问题地将数据从一个视图传递到其他视图。但这是我面临的问题。

I am able to pass data from one view to other view without any problem. But here is my situation i am facing problem.

让我们说
- >将数据传递到其他视图

ViewA->ViewB This working perfectly fine 
ViewB->ViewC This working perfectly fine
ViewC->ViewB Here is the problem.

我尝试使用推送segue ，它会转到ViewB但是当我按下时后退按钮进入 ViewC->后退按钮 - > ViewB->后退按钮 - >查看A.当我按下后退按钮时，从ViewB返回ViewA。

I tried using push segue ,it goes to ViewB but when i press back button it goes to ViewC->back button->ViewB->back button->View A. From ViewB when i press back button it must goes to ViewA.

尝试使用模态segue ，它会转到ViewB但是我不能去任何地方。

Tried using modal segue, it goes to ViewB but then i can't go any where.

由于我是iOs的新手，我真的不知道如何实现这个目标？

如何将数据传回来自ViewC的ViewB？

我想你们可以帮助我。

编辑

在视图中我正在调用ViewB这样

In View A i am calling ViewB like this

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:@"RemixScreen"])
{

    if([self.recipeFrom isEqualToString:@"ViewB"])
    {

        ViewB *reciepe = [segue destinationViewController];
        //somedata i will pass here

    }  
}
 }

在View B中我这样打电话

In View B i am calling like this

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
  {
if([segue.identifier isEqualToString:@"ViewA"])
{  
    ViewA *data = [segue destinationViewController];
    //some data  
}
}

感谢您的支持帮助人。

推荐答案

正确的方法是使用委托。您可以使用prepareForSegue中的属性向前传递数据，并使用委托将数据传回。

The correct way to do this is to use delegates. You use properties in prepareForSegue to pass data forward and delegates to pass data back.

它的工作方式是在ViewC中使用ViewC在prepareForSegue中设置委托属性。这样，ViewC可以通过您设置的协议与ViewB进行通信。

The way it works is to have a delegate property in ViewC that is set by ViewB in prepareForSegue. That way ViewC can communicate with ViewB via a protocol you set up.

编辑：添加代码以演示：

Adding code to demonstrate:

ViewControllerBInterface：

ViewControllerBInterface:

@protocol ViewBProtocol

- (void)setData:(NSData *)data;

@end

@interface ViewBController: UIViewController <ViewBProtocol>
...
@end

这里我们让ViewBController遵循我们的协议ViewCController将与之通信。

Here we make ViewBController follow our protocol that ViewCController will communicate to.

接下来是ViewCController接口：

Next up is ViewCController interface:

@interface ViewCController: UIViewController

@property (nonatomic, weak) id<ViewBProtocol> delegate;

...

@end

现在我们来看看ViewBController的prepareForSegue：

Now we look at ViewBController's prepareForSegue:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    UIViewController* controller = [segue destinationViewController];
    if ([controller isKindOfClass:[ViewCController class]])
    {
        ViewCController* viewCController = (ViewCController *)controller;
        viewCController.delegate = self;
    }
}

如您所见，我们将ViewC控制器链接到ViewB一个通过委托属性。现在我们在ViewC中做一些事情：

As you can see we link the ViewC controller to the ViewB one via the delegate property. Now we do something in ViewC:

- (void)sendData:(NSData *)data
{
    [self.delegate setData:data];
}

如果您愿意，可以在ViewCController的viewWillDisappear方法中使用它。

And you can use that in your viewWillDisappear method of ViewCController if you wanted to.

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