Hello i have an auto layout issue with `UIScrollView` and `ModalViewController`.
Here are my coding steps as sample code:

1) I have an `UIViewController` with an `UIScrollView` as `subView`

```
UIViewController *viewController = [[UIViewController alloc] init];
UIScrollView *scrollView = [[UIScrollView alloc] init];

scrollView.translatesAutoresizingMaskIntoConstraints = NO;
[viewController.view addSubview:scrollView];

UIView *superView = viewController.view;
NSDictionary *viewsDict = NSDictionaryOfVariableBindings(superView,scrollView);

[superView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollView(==superView)]|"
                                                                  options:0
                                                                  metrics:nil
                                                                    views:viewsDict]];
[superView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollView(==superView)]|"
                                                                  options:0
                                                                  metrics:nil
                                                                    views:viewsDict]];

```

this works

2) i add 2 sub views to the `scrollView`

```
UIView *view1 = [[UIView alloc] init];
view1.backgroundColor = [UIColor redColor];
view1.translatesAutoresizingMaskIntoConstraints = NO;
[scrollView addSubview:view1];

UIView *view2 = [[UIView alloc] init];
view2.backgroundColor = [UIColor greenColor];
view2.translatesAutoresizingMaskIntoConstraints = NO;
[scrollView addSubview:view2];

viewsDict = NSDictionaryOfVariableBindings(scrollView,view1,view2);

[scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[view1(==scrollView)]|"
                                                                   options:0
                                                                   metrics:nil
                                                                     views:viewsDict]];
[scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[view2(==scrollView)]|"
                                                                   options:0
                                                                   metrics:nil
                                                                     views:viewsDict]];

[scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[view1(180)][view2(==scrollView)]|"
                                                                   options:0
                                                                   metrics:nil
                                                                     views:viewsDict]];

UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:@"open" forState:UIControlStateNormal];
btn.frame = CGRectMake(10, 10, 100, 100);
[view2 addSubview:btn];
[btn addTarget:self action:@selector(openPopOver) forControlEvents:UIControlEventTouchUpInside];

```

this works also fine

3) I scroll to content offset y 180 that i can only see the view2

```
[scrollView setContentOffset:CGPointMake(0, 180) animated:YES];

```

4) I open a `ModalViewController` on the `ViewController

```
- (void)openModal{
UIViewController *viewController = [[UIViewController alloc] init];

UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:@"close" forState:UIControlStateNormal];
btn.frame = CGRectMake(10, 10, 100, 100);
[viewController.view addSubview:btn];
[btn addTarget:self action:@selector(closePopOver) forControlEvents:UIControlEventTouchUpInside];

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

```

}

5) when i close the `ModalViewController` my Layout on the `scrollView` didn't work it scrolls to an different content offset that i have not set. When i reset the content offset to y 180 the content size of the scrollview is wrong.

```
- (void)closeModal{
[self dismissViewControllerAnimated:YES completion:^{

}];

```

}

I hope someone can help me to fix this problem.