ios 添加全屏返回手势

1 建立导航控制器

2.导航控制器添加如下代码

- (void)viewDidLoad {
    [super viewDidLoad];

    id target = self.interactivePopGestureRecognizer.delegate;
   UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:target action:NSSelectorFromString(@"handleNavigationTransition:")];
    pan.delegate = self;
    [self.view addGestureRecognizer:pan];
    self.interactivePopGestureRecognizer.enabled = NO;
}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    if (self.childViewControllers.count == ) {
        return NO;
    }
    return YES;
}