全屏滑动返回

#import "XMGNavigationViewController.h"

@interface XMGNavigationViewController ()<UIGestureRecognizerDelegate>

@end

@implementation XMGNavigationViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self.interactivePopGestureRecognizer.delegate action:@selector(handleNavigationTransition:)];
    
    [self.view addGestureRecognizer:pan];
    
    // 控制手势什么时候触发,只有非根控制器才需要触发手势
    pan.delegate = self;
    
    // 禁止之前手势
    self.interactivePopGestureRecognizer.enabled = NO;
    
    // 假死状态:程序还在运行,但是界面死了.
    
    /*
        为什么导航控制器的手势不是全屏滑动 =>
     */
    
}

#pragma mark - UIGestureRecognizerDelegate
// 决定是否触发手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    return self.childViewControllers.count > 1;
}

// <_UINavigationInteractiveTransition: 0x7f9c948302a0>:手势代理

/*
 UIPanGestureRecognizer
 
 UIScreenEdgePanGestureRecognizer:导航滑动手势
 target=<_UINavigationInteractiveTransition 0x7fdc4a740440>)
 action=handleNavigationTransition:
 
 
 <UIScreenEdgePanGestureRecognizer: 0x7fdc4a740120; state = Possible; delaysTouchesBegan = YES; view = <UILayoutContainerView 0x7fdc4a73e690>; target= <(action=handleNavigationTransition:, >>

 */

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.childViewControllers.count > 0) { // 非根控制器
        
        // 恢复滑动返回功能 -> 分析:把系统的返回按钮覆盖 -> 1.手势失效(1.手势被清空 2.可能手势代理做了一些事情,导致手势失效)
        
        // 设置返回按钮,只有非根控制器
        viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem backItemWithimage:[UIImage imageNamed:@"navigationButtonReturn"] highImage:[UIImage imageNamed:@"navigationButtonReturnClick"]  target:self action:@selector(back) title:@"返回"];
    }
    
    // 真正在跳转
    [super pushViewController:viewController animated:animated];
    
}



@end