如何传递值当popToRoot

Question

想知道我如何传递价值回到根视图控制器时，我popToRoot。

introVideoViewController *intro = [introVideoViewController alloc]; 
    intro.fromReset =1; 
    [self.navigationController popToRootViewControllerAnimated:NO]; 

Answer 1

与您要弹出从后面的VC，你需要给它一个代表属性 -

@class MyViewController; 

@protocol MyViewControllerDelegate <NSObject> 

    -(void)myViewControllerDidDismiss:(MyViewController *)controller withSomeObject:(id)someObject; 

@end 


@interface MyViewController : UIViewController 

@property (nonatomic, assign) id<MyViewControllerDelegate> myViewControllerDelegate; 

@end 

...并在根VC你使其符合该协议，并实施罢免法 -

-(void)myViewControllerDidDismiss:(MyViewController *)controller withSomeObject:(id)someObject { 

    // now I've got the object from the VC I just popped 

} 

忘了提，你需要调用myViewControllerDidDismiss：withSomeObject：当你弹出的VC。

编辑 - 也忘了提，你需要设置VC的委托作为你的根VC，当你创建它，否则它会试图调用为零，当你弹回 -

[myViewController setMyViewControllerDelegate:self]; 

Answer 2

刚使用下面的代码

NSArray *arr = [self.navigationController viewControllers]; 
CLASS_OF_ROOT_VIEW_CONTROLLER *rvc = (CLASS_OF_ROOT_VIEW_CONTROLLER *)[arr objectAtIndex:0]; 
rvc.variable = value;