iOS开发之滑动返回失效

iOS笔记

当滑动返回失效时，有两种方法可以修复

方法一 （不推荐，只能在左侧滑动返回）

自定义UINavigationController.m文件
遵循UINavigationControllerDelegate协议
- (void)viewDidLoad {
    [super viewDidLoad];
    // 还原滑动返回功能
    self.popDelegate = self.interactivePopGestureRecognizer.delegate;
    self.delegate = self;
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.viewControllers.count != 0) { // 非根控制器
        viewController.hidesBottomBarWhenPushed = YES;
        // 设置导航条左边按钮的内容
        viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"NavBack"] style:UIBarButtonItemStyleBordered target:self action:@selector(back)];
        // 就有滑动返回功能
        self.interactivePopGestureRecognizer.delegate = nil;
    }
    [super pushViewController:viewController animated:animated];
}
#pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
    // 如果展示的是根控制器是根控制器，就还原pop手势代理
    if (viewController == [self.viewControllers firstObject]) {
        self.interactivePopGestureRecognizer.delegate = self.popDelegate;
    }
}

方法二 （推荐，简单、全屏都能滑动返回）

自定义UINavigationController.m文件
遵循UIGestureRecognizerDelegate协议
- (void)viewDidLoad {
    [super viewDidLoad];
    // 滑动返回相关
    [self slideToBack];
}
- (void)slideToBack{
    // 禁止系统原来的滑动返回手势，防止手势冲突
    self.interactivePopGestureRecognizer.enabled = NO;
    // 自定义滑动手势添加到self.view 调用系统原来的滑动返回方法
    // 即self.interactivePopGestureRecognizer.delegate的handleNavigationTransition:方法
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self.interactivePopGestureRecognizer.delegate action:@selector(handleNavigationTransition:)];
    pan.delegate = self;
    [self.view addGestureRecognizer:pan];
}
#pragma mark - 手势代理方法
// 是否开始触发手势，如果是根控制器就不触发手势
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    // 判断下当前控制器是否是根控制器
    return (self.topViewController != [self.viewControllers firstObject]);
}