Xcode/iOS: How to hide Navigation- AND ToolBar on scroll down?

ios, navigationbar, toolbar, xcode

Solution

The accepted answer does not work for me, as `scrollViewWillBeginScroll:` is not a delegate method.

Instead I do

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"BarsShouldHide" object:self];

}

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView 
                 willDecelerate:(BOOL)decelerate
{
    if(!decelerate)
        [[NSNotificationCenter defaultCenter] postNotificationName:@"BarsShouldUnhide" 
                                                            object:self];
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"BarsShouldUnhide"
                                                        object:self];
}

Anywhere in the app objects can listen for this notification,like

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserverForName:@"BarsShouldHide" 
                                                      object:nil
                                                       queue:nil
                                                  usingBlock:^(NSNotification *note) {
        //hide tab bar with animation;
    }];
    [[NSNotificationCenter defaultCenter] addObserverForName:@"BarsShouldUnhide" 
                                                      object:nil
                                                       queue:nil
                                                  usingBlock:^(NSNotification *note) {
        //Unhide tab bar with animation;
    }];
}

This code will hide the bars for any scroll. if you want to have only on down, the same `locationOffset` trick as in the accepted answer should work.

Problem

Original source