swift ios trying to change color of status bar on certain VC's

In my app I have 4 tabs/VC's and in two of them I am changing the status bar from white to black like this:

override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        UIApplication.sharedApplication().statusBarStyle = UIStatusBarStyle.Default
    }

    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)

        UIApplication.sharedApplication().statusBarStyle = .LightContent
    }

The only problem is if I switch between two tabs/VC's that both have the code above the statusbar will first change to black which is right, but then it changes to white again when entering the other VC.

How can I keep the status bar white on certain VC's ?