preferredStatusBarStyle not called in swift ?

As per the Apple doc, UIStatusBarStyle is the style of the device’s status bar. It is a enum type.

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Now, we can have two types of requirements to set the UIStatusBar style in swift projects.

Use the single type of UIStatusBarStyle for entire project:

There are two steps to set the one common style in an entire project.

1. Add ‘View controller-based status bar appearance’ to ‘NO’ in project info.plist
2. Select UIStatusBarStyle in Deployment Info of project target.

Deployment Info

Use the ViewControllers based UIStatusBarStyle for entire project:

There are two steps to set the ViewControllers based status bar in a project.

1. Remove ‘View controller-based status bar appearance’ the key from info.plist because by default it is true or you can add the ‘View controller-based status bar appearance’ to ‘YES’ in info.plist
2. Override the statusBarStyle properties in viewControllers.

Now, everything will work perfectly 😊 but in some scenarios you will see that above property will not getting called 🧐

Why preferredStatusBarStyle not called?

There can be lots of reason and you have to identify it.

Possible reasons:

1. Wrong StatusBar style key in info.plist
2. Forgot to override preferredStatusBarStyle property in rootViewController or in a viewController.
3. Forgot to override childForStatusBarStyle property, if viewController is added as a childViewController.
4. Forgot to override properties (preferredStatusBarStyle/childForStatusBarStyle) in UINavigationController, if viewController is embed in…