Can't remove/hide recently added view from self.navigationcontroller.view - ios

Question

I have a Navigationviewcontroller with a tableview in it. I am adding a UIView to self.navigationcontroller.view and constraints for Auto Layout. When I try to remove it from superview or to hide it, nothing happens.
Any ideas?
How I create the View and Constraints
-(void)doneWithTraining{
//Create Backgroundview
UIView *groupView = [[UIView alloc] init];
[groupView setTranslatesAutoresizingMaskIntoConstraints:NO];
groupView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
groupView.tag = 999;
groupView.alpha = 0.0;
[self.navigationController.view addSubview:groupView];
[self.navigationController.view addConstraint:[NSLayoutConstraint constraintWithItem:groupView
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:self.navigationController.view
attribute:NSLayoutAttributeLeft
multiplier:1.0
constant:0]];
[self.navigationController.view addConstraint:[NSLayoutConstraint constraintWithItem:groupView
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:self.navigationController.view
attribute:NSLayoutAttributeTop
multiplier:1.0
constant:0.0f]];
[self.navigationController.view addConstraint:[NSLayoutConstraint constraintWithItem:groupView
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self.navigationController.view
attribute:NSLayoutAttributeWidth
multiplier:1.0
constant:0.0]];
[self.navigationController.view addConstraint:[NSLayoutConstraint constraintWithItem:groupView
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:self.navigationController.view
attribute:NSLayoutAttributeHeight
}
multiplier:1.0
constant:0.0]];
//Animate View
[UIView animateWithDuration:0.2 animations:^(void) {
groupView.alpha = 1.0;
}];
How I try to remove the View
- (void)closeFinishAlert{
UIView *grouView = [self.navigationController.view viewWithTag:999];
grouView.hidden = YES;
NSLog(#"Check if closeFinishAlert is called");
//[self.navigationController popViewControllerAnimated:YES];
}
What I also tried
This removes the view an its content, but after this there is no user interaction possible. It looks like a crash, but Xcode tells me that the app is still running.
- (void)closeFinishAlert{
UIView *groupView = [self.navigationController.view viewWithTag:999];
for (UIView *subview in groupView.subviews) {
subview.hidden = YES;
[subview removeFromSuperview];
}
[_groupView removeFromSuperview];
//[self.navigationController popViewControllerAnimated:YES];
}

Answer 1

If you are actually just presenting a view which you will remove for sure later on,
then its better to create a ViewController class for your view and present it modally using :
[self presentViewController:yourViewControllerObject animated:NO completion:nil];
you can later on remove this view using:
[self dismissViewControllerAnimated:NO completion:nil];
hope this helps !

Answer 2

Thanks to "GoGreen" green I found a solution which works for me.
Create Viewcontroller from ViewDidAppear
- (void)viewDidAppear:(BOOL)animated{
if (executedExercises.count == [_fetchedResultsController.fetchedObjects count] && self.groupView == FALSE) {
[self performSelector:#selector(doneWithTraining) withObject:nil afterDelay:0.0];
}
}
Header file
#property (strong, nonatomic) UIViewController *groupView;
Creating the Viewcrontroller and its content
-(void)doneWithTraining{
_groupView = [[UIViewController alloc] init];
[self presentViewController:_groupView animated:YES completion:nil];
_groupView.view.backgroundColor = [UIColor whiteColor];
//SubTitle
UILabel *subTitleLabel = [[UILabel alloc] init];
[subTitleLabel setFont:[UIFont fontWithName:#"HelveticaNeue-Light" size:18.0]];
subTitleLabel.textColor = [BackgroundLayer gray];
[subTitleLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
subTitleLabel.numberOfLines = 5;
subTitleLabel.adjustsFontSizeToFitWidth = YES;
subTitleLabel.textAlignment = NSTextAlignmentCenter;
[_groupView.view addSubview:subTitleLabel];
subTitleLabel.text = subTitleText;
[_groupView.view addConstraint:[NSLayoutConstraint constraintWithItem:subTitleLabel
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationLessThanOrEqual
toItem:_groupView.view
attribute:NSLayoutAttributeWidth
multiplier:0.0
constant:300.0f]];
[_groupView.view addConstraint:[NSLayoutConstraint constraintWithItem:subTitleLabel
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:_groupView.view
attribute:NSLayoutAttributeHeight
multiplier:0.0
constant:140]];
[_groupView.view addConstraint:[NSLayoutConstraint constraintWithItem:subTitleLabel
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:_groupView.view
attribute:NSLayoutAttributeCenterX
multiplier:1.0
constant:0.0]];
[_groupView.view addConstraint:[NSLayoutConstraint constraintWithItem:subTitleLabel
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:_groupView.view
attribute:NSLayoutAttributeCenterY
multiplier:1.0
constant:0.0]];}
Removing ViewController
- (void)closeFinishAlert{
[_groupView dismissViewControllerAnimated:NO completion:nil];
[self.navigationController popViewControllerAnimated:YES];
}