How to Draw a Transparent Uitoolbar or Uinavigationbar in iOS7

How to draw a transparent UIToolbar or UINavigationBar in iOS7

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

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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

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Objective-C

Transparent UIToolbar

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

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Transparent UINavigationBar

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

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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.

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Final result

How to make UIToolbar have a Clear Background?

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

 [self.toolbar setBackgroundColor:[UIColor clearColor]];

Transparent UIToolbar

You can set the property translucent to YES and see if this helps.

How to make completely transparent navigation bar in iOS 7

From this answer

[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                     forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];
self.navigationController.navigationBar.translucent = YES;
self.navigationController.view.backgroundColor = [UIColor clearColor];
self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];

Also, as suggested by Josh in the comments, to put the bar back to default:

[self.navigationController.navigationBar setBackgroundImage:nil
                     forBarMetrics:UIBarMetricsDefault];

How to make UIToolbar's background transparent?

If you want toolbar as
Transparent :

[toolBar setBackgroundImage:[[UIImage alloc] init] forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];

and if you want toolbar as Translucent :

[toolBar setBarStyle:UIBarStyleBlack];
toolBar.translucent = YES;

Hope it helps you.

How to set transparency of translucent navigation bar in iOS7?

It's late, but if anyone need the answer here it is.


If you want transparency in all navigationBar than write following lines in your AppDelegate's
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
method:

## Objective C ##

[[UINavigationBar appearance] setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance] setShadowImage:[UIImage new]];
[[UINavigationBar appearance] setTranslucent:YES];

## Swift ##

UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)
UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().translucent = true

For transparency in particular view, check this answer.

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