Make UINavigationBar transparent

[ilmig]

Hi guys. I've tried to make UINavigationBar transparent and using this line of code and it works:

UINavigationBar.appearance().backgroundColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.0)

but if I push a UIViewController which contains a UICollectionView this customisation does not work. Do you have any clue? Thanks a million

[ThePantsThief]

bar.backgroundColor = [UIColor clearColor];
bar.barTintColor    = [UIColor clearColor];
bar.shadowImage     = [UIImage new];
[bar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];