Change statusbar background color iOS

UINavigationController+StatusbarColorChange.swift

import Foundation

extension UINavigationController {
    public override class func initialize() {
        struct Static {
            static var token: dispatch_once_t = 0
        }

        if self !== UINavigationController.self {
            return
        }

        dispatch_once(&Static.token) {
            let originalSelector = #selector(self.viewDidLoad)
            let swizzledSelector = #selector(self.viewDidLoadWithColoredStatusbar)

            let originalMethod = class_getInstanceMethod(self, originalSelector)
            let swizzledMethod = class_getInstanceMethod(self, swizzledSelector)

            let didAddMethod = class_addMethod(self, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod))

            if didAddMethod {
                class_replaceMethod(self, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod))
            } else {
                method_exchangeImplementations(originalMethod, swizzledMethod)
            }
        }
    }

    func viewDidLoadWithColoredStatusbar() {
        self.viewDidLoadWithColoredStatusbar()

        let backgroundView = UIView.init(frame: UIApplication.sharedApplication().statusBarFrame)
        backgroundView.backgroundColor = UIColor.blackColor()
        self.view.addSubview(backgroundView)
    }
}