YYXC_Student/jiaPei/MyUINavigationController.m

//
//  MyUINavigationController.m
//  jiaPeiC
//
//  Created by Echopentakill on 16/12/13.
//  Copyright © 2016年 JCZ. All rights reserved.
//

#import "MyUINavigationController.h"

@interface MyUINavigationController ()<UINavigationControllerDelegate, UIGestureRecognizerDelegate>

@end

@implementation MyUINavigationController

- (void)viewDidLoad {
    [super viewDidLoad];
    __weak MyUINavigationController *weakSelf = self;
    
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
    {
        self.interactivePopGestureRecognizer.delegate = weakSelf;
        self.delegate = weakSelf;
    }
}

//在转场/过渡的时候禁用 interactivePopGestureRecognizer当用户在转场的时候触发一个后退手势,则各种事件又凑一块了.导航栈内又成了混乱的.我的解决办法是,转场效果的过程中禁用手势识别,当新的视图控制器加载完成后再启用.再次建议使用UINavigationController的子类操作

-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
        self.interactivePopGestureRecognizer.enabled = NO;
    
    [super pushViewController:viewController animated:animated];
}


#pragma mark UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    // Enable the gesture again once the new controller is shown
    NSArray *arr = @[@"ExerciseVC",@"LeeVideoVC"];
    for (NSString *str in arr) {
        Class cls =NSClassFromString(str);
        if ([viewController isMemberOfClass:cls]) {
            return;
        }
    }
    
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
        self.interactivePopGestureRecognizer.enabled = YES;
}

//
//解决左滑手势冲突和不灵敏的问题
-(UIViewController *)popViewControllerAnimated:(BOOL)animated {
    
    return [super popViewControllerAnimated:YES];
}
#pragma mark UIGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    if ([self.childViewControllers count] == 1) {
        return NO;
    }
    return YES;
}

// 我们差不多能猜到是因为手势冲突导致的，那我们就先让 ViewController 同时接受多个手势吧
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}

//运行试一试，两个问题同时解决，不过又发现了新问题，手指在滑动的时候，被 pop 的 ViewController 中的 UIScrollView 会跟着一起滚动，这个效果看起来就很怪（知乎日报现在就是这样的效果），而且也不是原始的滑动返回应有的效果，那么就让我们继续用代码来解决吧
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return [gestureRecognizer isKindOfClass:UIScreenEdgePanGestureRecognizer.class];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end