清空代理实现返回按钮的手势操作和全局返回手势操作

文章很短_{希望对大家有帮助}一下写太多了感觉都没人看~

//如果发现返回页面的左侧手势没有了,只能按"返回"才能回到上一页的话 , 只需清空手势代理方法即可!
//清空代理:#import "BaseNavigationController.h"

@interface BaseNavigationController () <UIGestureRecognizerDelegate>

@end

@implementation BaseNavigationController

+ (void)load {
    UINavigationBar *navBar = [UINavigationBar appearanceWhenContainedInInstancesOfClasses:@[[self class]]] ;
    //只要是通过模型设置 , 都是通过富文本设置:
    NSMutableDictionary *attrsDic = [NSMutableDictionary dictionary] ;
    attrsDic[NSFontAttributeName] = [UIFont boldSystemFontOfSize:20] ;
    [navBar setTitleTextAttributes:attrsDic] ;
    //设置背景图片:
    [navBar setBackgroundImage:[UIImage imageNamed:@"navigationbarBackgroundWhite"] forBarMetrics:UIBarMetricsDefault] ;
    
}

/*
 <UIScreenEdgePanGestureRecognizer: 0x7fb8b7613f80; state = Possible; delaysTouchesBegan = YES; view = <UILayoutContainerView 0x7fb8b760f6d0>; target= <(action=handleNavigationTransition:, target=<_UINavigationInteractiveTransition 0x7fb8b7613e40>)>> 
 */

- (void)viewDidLoad {
    [super viewDidLoad];
    //清空代理:
//    self.interactivePopGestureRecognizer.delegate = self ;
//    UIScreenEdgePanGestureRecognizer *edgePan = (UIScreenEdgePanGestureRecognizer *)self.interactivePopGestureRecognizer ;
//    edgePan.edges = UIRectEdgeNone ;
    //得hook到 UIScreenEdgePanGestureRecognizer 这个代码的action是怎么实现的!我并不知道如何实现全屏滑动 , 但是UIScreenEdgePanGestureRecognizer却知道!他的实现就是全屏滑动!
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self.interactivePopGestureRecognizer.delegate action:@selector(handleNavigationTransition:)] ;
    panGesture.delegate = self ;
    [self.view addGestureRecognizer:panGesture] ;
    //禁掉之前的滑动手势:
    self.interactivePopGestureRecognizer.enabled = NO ;
}

#pragma mark - <UIGestureRecognizerDelegate>
//防止用户在根控制器的时候会造成假死状态:
//根控制器没有返回功能,但是手势操作🈶凌驾于逻辑之上,造成程序假死 ;
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(nonnull UITouch *)touch {
    if (self.childViewControllers.count > 1) {
        return YES ;
    } else {
        return NO ;
    }
}

//重写pushViewController操作;
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    //如果是非根控制器再去统一设置"返回":
    if (self.childViewControllers.count > 0) {
        viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem backItemWithImage:[UIImage imageNamed:@"navigationButtonReturn"] andSelectedImage:[UIImage imageNamed:@"navigationButtonReturnClick"] setBackTitle:@"返回" addTarget:self action:@selector(backClick)] ;
    }
    [super pushViewController:viewController animated:animated] ;
}

- (void)backClick {
    [self popViewControllerAnimated:YES] ;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    
}

@end

• 截图如下:

Pop手势代理方法.gif

愿编程让这个世界更美好