iOS7 UIScrollView contentInset 不起作用

Question

When the keyboard was hidden, the scrollview should back to it's origin contentInset, but it's not working in iOS7. Setting scrollview's contentInset when keyboard was shown is working but when the keyboard was hidden, the scrollview's contentInset can't set to inset zero. The code:

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:Nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification object:nil];
}

- (void)keyboardWasShown:(NSNotification *)notif
{
    CGSize keyboardSize = [[[notif userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0, 0, keyboardSize.height, 0);


    UIScrollView *scrollView = (UIScrollView *)self.view;
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;

    CGRect rect = self.view.frame;
    rect.size.height -= keyboardSize.height;
    if (!CGRectContainsPoint(rect, self.wishContentField.frame.origin)) {
        CGPoint point = CGPointMake(0, self.wishContentField.frame.origin.y - keyboardSize.height);
        [scrollView setContentOffset:point animated:YES];
    }

}
- (void)keyboardWasHidden:(NSNotification *)notif
{
    UIEdgeInsets zeroInsets = UIEdgeInsetsZero;
    UIScrollView *scrollView = (UIScrollView *)self.view;
    [scrollView setContentInset:zeroInsets];
    scrollView.scrollIndicatorInsets = zeroInsets;
}

Answer 1

Try this one:

self.automaticallyAdjustsScrollViewInsets = NO;

This is working for me...

Answer 2

it might be related to contentSize not working except when set in VCs

- (void)viewDidLayoutSubviews
{
     self.scrollView.contentSize = whatever
}

just saying you might be smashing your head against the wrong wall

Answer 3

So, just because I still found this answer useful, here is what I did. I took the advice of @alex-i and the comment by @yong-ho. But for some reason the height of the navigation bar wasn't quite enough.

UIEdgeInsets contentInsets = UIEdgeInsetsMake(self.navigationController.navigationBar.frame.size.height + 20.0f, 0.0, 0.0, 0.0); 
scrollView.contentInset = contentInsets;
scrollView.scrollIndicatorInsets = contentInsets;

Like I said, I had to add that 20.0f or my content was still cut off. Not sure why. If I figure it out I'll update my answer.

Answer 4

Set contentOffset to zero. It will work in all cases no matter your scroll view is inside navigation controller or any other. Find below the code snippet for same:

- (void)keyboardWasHidden:(NSNotification *)notif
{    
    UIScrollView *scrollView = (UIScrollView *)self.view;
    scrollView.contentOffset = CGPoint.zero
}

Answer 5

I also found that if you set a new contentinset exactly the same as the existing inset, the scrollview may ignore it and revert to a zero inset. So an easy workaround is to check that the new contentinset you are setting is at least 1 point different than the last.