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iosuinavigationcontrolleruinavigationbarios7uitoolbar

How to draw a transparent UIToolbar or UINavigationBar in iOS7

I would like an entirely transparent UIToolbar and/or UINavigationBar. I have tried the various incantations suggested for pre- and post-iOS 5 but none seem to work any more.

How might this be accomplished in iOS 7?

Solution

  • Swift 3 (iOS 10)

    Transparent UIToolbar

    self.toolbar.setBackgroundImage(UIImage(),
                                forToolbarPosition: .any,
                                barMetrics: .default)
self.toolbar.setShadowImage(UIImage(), forToolbarPosition: .any)

    Transparent UINavigationBar

    self.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationBar.shadowImage = UIImage()
self.navigationBar.isTranslucent = true

    Swift < 3

    Transparent UIToolbar

    self.toolbar.setBackgroundImage(UIImage(),
                                forToolbarPosition: UIBarPosition.Any,
                                barMetrics: UIBarMetrics.Default)
self.toolbar.setShadowImage(UIImage(),
                            forToolbarPosition: UIBarPosition.Any)

    Transparent UINavigationBar

    self.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)
self.navigationBar.shadowImage = UIImage()
self.navigationBar.translucent = true

    Objective-C

    Transparent UIToolbar

    [self.toolbar setBackgroundImage:[UIImage new]
              forToolbarPosition:UIBarPositionAny
                      barMetrics:UIBarMetricsDefault];
[self.toolbar setShadowImage:[UIImage new]
          forToolbarPosition:UIBarPositionAny];

    Transparent UINavigationBar

    [self.navigationBar setBackgroundImage:[UIImage new]
                         forBarMetrics:UIBarMetricsDefault];
self.navigationBar.shadowImage = [UIImage new];
self.navigationBar.translucent = YES;

    Discussion

    Setting translucent to YES on the navigation bar does the trick, due to a behavior discussed in the UINavigationBar documentation. I'll report here the relevant fragment:

    If you set this property to YES on a navigation bar with an opaque custom background image, the navigation bar will apply a system opacity less than 1.0 to the image.

    Final result

    final result