- (void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    // 禁用 iOS7 返回手势

    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {

        self.navigationController.interactivePopGestureRecognizer.enabled = NO;

    }

}

- (void)viewWillDisappear:(BOOL)animated

{

    [super viewWillDisappear:animated];

    // 开启

    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {

        self.navigationController.interactivePopGestureRecognizer.enabled = YES;

    }

}