Tag Archives: UINavigationBar

How to set the colour in a UINavigationBar

Since Xcode 5 and iOS 7 the default appearance of a UINavigationBar is black translucent. This even affects the same app running in iOS 6. Black opaque is deprecated and can no longer be set in Interface Builder.

However, you can set the appearance for all nav bars by putting this little gem in your App Delegate’s didFinishLaunchingWithOptions method:

You can specify colours other than black.

Note that iOS 7 devices are affected differently by this change: only the icon/text colour will change into your specified colour, but the bar itself will remain translucent. Using black means text buttons are barely readable. Hence, a version check would be appropriate:

How to hide a UIBarButtonItem in your Navigation Controller

Since UIBarButtonItems do not have a “hidden” property, we can’t just set this to yes and it’ll disappear. Instead, we can set them to nil.

In this example we’re hiding the right item in the navigation controller:

How to hide navigation elements with swishy animations

You can hide (and show) navigation bars and toolbars from your UINavigationController with extremely funky animations, much like we see in the Photos app on iOS. In the app, when you single-tap the screen, both top and bottom toolbars disappear.

Here’s how we do that: Provided you have your view controller embedded in a UINavigationController, you can call the following methods to slide the top and bottom bars in and out:

On the same note, you can do the same (and better) with the status bar at the very top of your screen (that’s the one that contains the time and carrier).

Here you even have a choice of

  • UIStatusBarAnimationSlide
  • UIStatusBarAnimationFade
  • UIStatusBarAnimationNone

How to create a UIBarButtonItem in code and make it call a method

Some things are really easy to do via a Storyboard – but when you want to create the same thing in code I frequently forget how to do it.

Turns out it’s equally simple: this example assumes you have a View Controller which is embedded in a Navigation Controller (so it already has a UINavigationBar at the top). Here’s how you add a button to it, set the title and target, and tell it what to do when it’s pressed:

You can set the button on the left hand site by using self.navigationItem.leftBarButtonItem

How to change the back button text on a UINavigationController

In Your Storyboard

I didn’t know the storyboard could do this, but it can:

Select the Navigation Bar in question, then check the Attributes Inspector:

Screen Shot 2013-03-03 at 19.19.25

In Code

To set the title in code, you need to address the self.navigationItem.backBarButton property of your view controller and pass it a new UIBarButtonItem. Here’s one way of doing it:

Alternatively we can use a much longer init method which will set the title in one line:

One Thing of Note

The back button (and its text) is only displayed in the NEXT view controller on the stack. So changing the back button in the detail view controller for example doesn’t change what’s displayed when the detail view controller is displayed. You must change it one step earlier, in the master controller’s navigation bar.

Screen Shot 2013-03-03 at 19.22.06