如何傳遞值當popToRoot

Question

想知道我如何傳遞價值回到根視圖控制器時，我popToRoot。

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

Answer 1

與您要彈出從後面的VC，你需要給它一個代表屬性 -

@class MyViewController; 

@protocol MyViewControllerDelegate <NSObject> 

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

@end 


@interface MyViewController : UIViewController 

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

@end 

...並在根VC你使其符合該協議，並實施罷免法 -

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

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

} 

忘了提，你需要調用myViewControllerDidDismiss：withSomeObject：當你彈出的VC。

編輯 - 也忘了提，你需要設置VC的委託作爲你的根VC，當你創建它，否則它會試圖調用爲零，當你彈回 -

[myViewController setMyViewControllerDelegate:self]; 

Answer 2

剛使用下面的代碼

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