Whose view is not in window hierarchy issue

问题:

I've set up a navController, which appears after tapping a button. However, if I tap the button I get the error of: "Warning: Attempt to present <UINavigationController>: 0xab5d9d0 on <MyApp: 0xadaa320> whose view is not in the window hierarchy!"

Does anyone know how to solve this? I also tried something on Stackoverflow but it wasn't my solution.

Here my code for opening the navigationcontroller:

I dont know if somebody know this photogallery but if you don't, here is the project.

My code (MyApp.m):

#import MyApp.h
...
//some stuff
- (void)launchGalleryView
{



    MWPhotoBrowser *browser = [[MWPhotoBrowser alloc] initWithDelegate:self];

    // Set browser options.
    browser.wantsFullScreenLayout = YES;
    browser.displayActionButton = NO;


    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:browser];

    NSMutableArray *photos = [[NSMutableArray alloc] init];
    MWPhoto *photo;
    photo = [MWPhoto photoWithFilePath:[[NSBundle mainBundle] pathForResource:@"callculator" ofType:@"jpg"]];
    photo.caption = @"The calculator is soo beateful...";
    [photos addObject:photo];

    self.photos = photos;

    [self presentModalViewController:navController animated:NO];
}

Thanks in advance.

Edit:

it is in the recources and in the compile sources but in the resources you can see that it is red (the storyboard). Maybe it's caused by this?

The Second controller .h:

@class MyApp;

@interface Second : UIViewController <MWPhotoBrowserDelegate> {

}



@property (nonatomic, retain) MyApp* vC;

@end

The Secnond controller .m:

#import "Second.h"
#import "MyApp.h"


@interface Second ()

@end

@implementation Second

@synthesize vC;
    //some stuff in here


//the action 
    - (IBAction)dothis:(id)sender {

        NSLog(@"launch the navcontroller");


        [self.vC launchGalleryView];

    }

MyApp.h:

#import "Second.h"


@interface myApp : UIViewController  <MWPhotoBrowserDelegate> {
    }

-(void)launchGalleryView;

NSArray *_photos;

NEW EDIT:

I found that I have to call the method "launchGalleryView" in the viewDidAppear but how can I do this without calling the navcontroller everytime the view loads? Does anyone know how to do this?

回答1:

i checked your project.. wasn't able to sort out the proper issue..

but i tried a hack and it worked..

replace this line with

[self presentModalViewController:navController animated:YES];

this

[[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentModalViewController:navController animated:YES];