/// 然后在viewWillAppear里头设置statusBar的Style
[[UIApplication sharedApplication] setStatusBarStyle:<#(UIStatusBarStyle)#>]

    - (UIStatusBarStyle)preferredStatusBarStyle NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED; // Defaults to UIStatusBarStyleDefault

/// 重写Nav的这些方法就解决这些问题了
- (UIViewController *)childViewControllerForStatusBarStyle {
    return self.topViewController;
}

- (UIViewController *)childViewControllerForStatusBarHidden {
    return self.topViewController;
}