An implementation of a UINavigationBar subclass for iOS7 which creates a taller navigation bar suitable for adding extra controls underneath the title.The appearance proxy is used for shifting the title and bar button items back up to their original vertical position.Note that it's easy to specify your subclass in XCode: clicking on the UINaviga…

gistfile1.txt

#define kAppNavBarHeight 66.0

@implementation TATallNavigationBar

- (id)initWithCoder:(NSCoder *)aDecoder {

    self = [super initWithCoder:aDecoder];
    if (self) {
        [self setupAppearance];
    }
    return self;
}

- (id)init
{
    self = [super init];
    if (self) {
        [self setupAppearance];
    }
    return self;
}

- (void)setupAppearance {

    static BOOL appearanceInitialised = NO;

    if (!appearanceInitialised) {

        // Update the appearance of this bar to shift the icons back up to their normal position

        CGFloat offset = 44 - kAppNavBarHeight;
        
        [[TATallNavigationBar appearance] setTitleVerticalPositionAdjustment:offset forBarMetrics:UIBarMetricsDefault];
        [[UIBarButtonItem appearanceWhenContainedIn:[RRSNavigationBar class], nil] setBackgroundVerticalPositionAdjustment:offset forBarMetrics:UIBarMetricsDefault];
        [[UIBarButtonItem appearanceWhenContainedIn:[RRSNavigationBar class], nil] setBackButtonBackgroundVerticalPositionAdjustment:offset forBarMetrics:UIBarMetricsDefault];
        [[UIBarButtonItem appearanceWhenContainedIn:[RRSNavigationBar class], nil] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, offset) forBarMetrics:UIBarMetricsDefault];

        appearanceInitialised = YES;
    }
}

- (CGSize)sizeThatFits:(CGSize)size {

    return CGSizeMake(self.superview.frame.size.width, kNavBarheight);

}

- (void)layoutSubviews {
    
    static CGFloat yPosForArrow = -1;
    
    [super layoutSubviews];

    // There's no official way to reposition the back button's arrow under iOS 7. It doesn't shift with the title.
    // We have to reposition it here instead.
    
    for (UIView *view in self.subviews) {
        
        // The arrow is a class of type _UINavigationBarBackIndicatorView. We're not calling any private methods, so I think
        // this is fine for the AppStore...
        
        if ([NSStringFromClass([view class]) isEqualToString:@"_UINavigationBarBackIndicatorView"]) {
            CGRect frame = view.frame;
            
            if (yPosForArrow < 0) {
                
                // On the first layout we work out what the actual position should be by applying our offset to the default position.
                
                yPosForArrow = frame.origin.y + (44 - kAppNavBarHeight);
            }
            
            // Update the frame.
            
            frame.origin.y = yPosForArrow;
            view.frame = frame;
        }
    }
}

@end