IOS视图位置可能变化解决问题

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

   

    if (IOS7) {

        self.edgesForExtendedLayout = UIRectEdgeNone;

        self.modalPresentationCapturesStatusBarAppearance = NO;

        self.extendedLayoutIncludesOpaqueBars = NO;

        self.automaticallyAdjustsScrollViewInsets = NO;

        [self setNeedsStatusBarAppearanceUpdate];

    }

}

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    self.navigationController.navigationBar.translucent = NO;

    self.tabBarController.tabBar.translucent = NO;

}