- (void)viewWillAppear:(BOOL)animated{

    [super viewWillAppear:YES];

[self.navigationController.navigationBar setBarTintColor:[UIColor blackColor]];//导航栏背景色

[self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],NSForegroundColorAttributeName,nil]];//导航栏标题颜色

[self.navigationController.navigationBar setBarStyle:UIBarStyleBlack];//状态栏颜色

}

- (UIStatusBarStyle)preferredStatusBarStyle{

    //设置状态栏前景色（需要与[self.navigationController.navigationBar setBarStyle:UIBarStyleBlack];组合使用）

    return UIStatusBarStyleLightContent;

}

- (void)viewWillDisappear:(BOOL)animated{

    [super viewWillDisappear:YES];

    //本界面消失时 让导航栏啥的都还原

    [self.navigationController.navigationBar setBarTintColor:[UIColor whiteColor]];//导航栏背景色

    [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor blackColor],NSForegroundColorAttributeName,nil]];//导航栏标题颜色

    [self.navigationController.navigationBar setBarStyle:UIBarStyleDefault];

}