禁止滑动手势返回前一页

- (void)viewDidAppear:(BOOL)animated{
        [super viewDidAppear:animated];
        if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
            self.navigationController.interactivePopGestureRecognizer.enabled = NO;
        }
    
}
- (void)viewWillDisappear:(BOOL)animated{
        [super viewWillDisappear:animated];
        if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
            self.navigationController.interactivePopGestureRecognizer.enabled = YES;
        }
}