iOS实现右滑手势返回上一级

iOS实现右滑手势返回

1、申明实现代理

@interface BaseViewController ()<UIGestureRecognizerDelegate>

2、在viewDidLoad 方法中设置手势并禁用系统滑动手势

- (void)viewDidLoad {
    [super viewDidLoad];
    //1.获取系统interactivePopGestureRecognizer对象的target对象
    id target = self.navigationController.interactivePopGestureRecognizer.delegate;
    
    //2.创建滑动手势，taregt设置interactivePopGestureRecognizer的target，所以当界面滑动的时候就会自动调用target的action方法。
    //handleNavigationTransition是私有类_UINavigationInteractiveTransition的方法，系统主要在这个方法里面实现动画的。
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] init];
    
    [pan addTarget:target action:NSSelectorFromString(@"handleNavigationTransition:")];
    
    //3.设置代理
    pan.delegate = self;
    
    //4.添加到导航控制器的视图上
    [self.navigationController.view addGestureRecognizer:pan];
    
    //5.禁用系统的滑动手势
    self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}

3、实现代理方法

#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    //导航的rootViewController关闭右滑返回功能
    if (self.navigationController.viewControllers.count <= 1)
    {
        return NO;
    }
    return YES;
}