ios --也是在B页面的生命周期设置如下代码。方法一是直接关闭和激活侧滑手势，方法二则是B遵循协议UIGestureRecognizerDelegate，设置侧滑交互代理，重写手势方法。

@property (weak, nonatomic) id<UIGestureRecognizerDelegate> restoreInteractivePopGestureDelegate;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    _restoreInteractivePopGestureDelegate = self.navigationController.interactivePopGestureRecognizer.delegate;
}

-(void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    if([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.navigationController.interactivePopGestureRecognizer.delegate = self;
    }
}
-(void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    if([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.navigationController.interactivePopGestureRecognizer.delegate = _restoreInteractivePopGestureDelegate;
    };
}
#pragma mark -UIGestureRecognizerDelegate
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    return NO;
}