呈现视图控制器

Question

I am presenting a table view controller after taking a picture with this code:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    // NSLog(@"didFinishPickingMediaWithInfo");

    [self.tabBarController dismissViewControllerAnimated:NO completion:nil];


    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];

    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {

        self.image = [info objectForKey:UIImagePickerControllerOriginalImage];
        if (self.imagePicker.sourceType == UIImagePickerControllerSourceTypeCamera) {

            NSLog(@"A photo was taken!");



            CCCameraViewController *viewController = [[CCCameraViewController alloc] initWithImage:self.image];
            [viewController setModalTransitionStyle:UIModalTransitionStyleCoverVertical];

            [self.navController setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
            [self.navController pushViewController:viewController animated:YES];

            self.navController.navigationBar.tintColor = [UIColor blueColor];

            viewController.tableView.tintColor = [[UIColor alloc] initWithRed:49.0 / .0 green:.0 / .0 blue:.0 / .0 alpha:1.0];



            [self.tabBarController presentViewController:self.viewController animated:YES completion:nil];

But when I run and after I take the picture and try to present CCcameraviewController , i get this termination error:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present a nil modal view controller on target .'

Answer 1

Should be

[self.tabBarController presentViewController:self.navController animated:YES completion:nil];

It's self.navController not self.viewController

Answer 2

you should set self.viewController first. Like this :

CCCameraViewController *viewController = [[CCCameraViewController alloc] initWithImage:self.image];
self.viewController = viewController;