This seems to work too

gistfile1.txt

- (void)loadGroup:(NSString *)group {
    // If the groups the same, no need to reload.
    if ([_currentGroup isEqualToString:group]) {
        return;
    }
    _currentGroup = group;

    NSLog(@"%@: %@", _currentGroup, [_appearanceContainer[_currentGroup] backgroundColor]);
    [UIView animateWithDuration:kAnimationDuration animations:^{
        _sharedInstance.frame = CGRectMake(0, _parentView.frame.size.height, _parentView.frame.size.width, kAppBarTotalHeight);
    } completion:^(BOOL finished) {
        self.backgroundColor = [_appearanceContainer[_currentGroup] backgroundColor];
        [self showMinimalAppBar];
        [self setButtonFrames];
        [self setNeedsDisplay];
    }];
}