Question

I am writing an iOS app where, in a view there is a button. Clicking on that button gets an action sheet which has options to pick image from camera or gallery. After the image is picked, it should be passed on to another view by manually calling a segue. The image picker appears and the prepare for segue code is executed, but the segue doesnt appear. There are no errors and I have checked all identifiers etc. Here is the code:

-(IBAction)showButtonClicked:(id)sender {
    UIActionSheet *photoActionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Take Photo", @"Choose from Library", nil];
    photoActionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
    [photoActionSheet showInView:self.tabBarController.tabBar];
}

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

     switch (buttonIndex) {
     case 0:
            {
            [self dismissModalViewControllerAnimated:YES];
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
             picker.delegate = self;
             picker.sourceType = UIImagePickerControllerSourceTypeCamera;
             [self presentModalViewController:picker animated:YES];
             break;
            }
         case 1:
            {
            [self dismissModalViewControllerAnimated:YES];
             UIImagePickerController *picker = [[UIImagePickerController alloc] init];
             picker.delegate = self;
             picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
             [self presentModalViewController:picker animated:YES];
             break;
            }
     default:
             break;

     }

}



- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([segue.identifier isEqualToString:@"goToPhotoDetails"]){
        FostoPhotoDetailsViewController *photoDetails = (FostoPhotoDetailsViewController *)segue.destinationViewController;
        photoDetails.imageView.image = self.buttonImage1;
    }
}



- (void) imagePickerController:(UIImagePickerController *)picker
         didFinishPickingImage:(UIImage *)image
                   editingInfo:(NSDictionary *)editingInfo
{

    self.buttonImage1 = image;
    //FostoPhotoDetailsViewController *photoDetails = [[FostoPhotoDetailsViewController alloc] init];
    //photoDetails.imageView.image = image;
    [self dismissModalViewControllerAnimated:NO];
    NSLog(@"Test");
    [self performSegueWithIdentifier:@"goToPhotoDetails" sender:self];
}

Answer 1

Sounds like you are executing a segue with style push without being inside a UINavigationController.

When you call performSegueWithIdentifier:sender: it first correctly calls prepareForSegue:sender: then it tries to retrieve the current navigation controller and push the destination controller doing something like

[self.navigationController pushViewController:destinationController animated:YES];

But since you are not inside a UINavigationController the property navigationController is set to nil, causing the above call to fail silently.

Either change the display style of your segue to something other than push (for instance modal) or embed you controller in a UINavigationController.