Combining a strong colour with a blurred and translucent UINavigationBar in iOS 7.

Strong UINavigationBar colour

// cheers to @stroughtonsmith for helping out with this one

UIColor *barColour = [UIColor colorWithRed:0.13f green:0.14f blue:0.15f alpha:1.00f];
    
UIView *colourView = [[UIView alloc] initWithFrame:CGRectMake(0.f, -20.f, 320.f, 64.f)];
colourView.opaque = NO;
colourView.alpha = .7f;
colourView.backgroundColor = barColour;
    
self.navigationBar.barTintColor = barColour;
    
[self.navigationBar.layer insertSublayer:colourView.layer atIndex:1];

I've done the same thing above but my navigation delegate is a bit different. Instead of toggling the translucency it just moves the layer back into position on didShowViewController:

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{

    [self.strongColorView.layer removeFromSuperlayer];
    [navigationController.navigationBar.layer insertSublayer:self.strongColorView.layer atIndex:1];
}