禁用ios7 手势滑动返回功能

在有的时候，我们不需要手势返回功能，那么可以在页面中添加以下代码：

- (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;
    }
}