iOS 如何在整个屏幕中都能实现滑动返回的效果

 - (void)setupGetsInNav
 {
     UIGestureRecognizer *gesture = self.interactivePopGestureRecognizer;
     gesture.enabled = NO;
     UIView *gestureView = gesture.view;

     UIPanGestureRecognizer *popRecognizer = [[UIPanGestureRecognizer alloc] init];
     popRecognizer.delegate = self;
     popRecognizer.maximumNumberOfTouches = ;
     [gestureView addGestureRecognizer:popRecognizer];
     /**
      *  获取系统手势的target数组
      */
     NSMutableArray *_targets = [gesture valueForKey:@"_targets"];
     /**
      *  获取它的唯一对象，我们知道它是一个叫UIGestureRecognizerTarget的私有类，它有一个属性叫_target
      */
     id gestureRecognizerTarget = [_targets firstObject];
     /**
      *  获取_target:_UINavigationInteractiveTransition，它有一个方法叫handleNavigationTransition:
      */
     id navigationInteractiveTransition = [gestureRecognizerTarget valueForKey:@"_target"];
     /**
      *  通过前面的打印，我们从控制台获取出来它的方法签名。
      */
     SEL handleTransition = NSSelectorFromString(@"handleNavigationTransition:");
     /**
      *  创建一个与系统一模一样的手势，我们只把它的类改为UIPanGestureRecognizer
      */
     [popRecognizer addTarget:navigationInteractiveTransition action:handleTransition];

 }

 - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
     /**
      *  这里有两个条件不允许手势执行，1、当前控制器为根控制器；2、如果这个push、pop动画正在执行（私有属性）
      */
     return self.viewControllers.count !=  && ![[self valueForKey:@"_isTransitioning"] boolValue];
 }

只需要在全局的导航控制器中添加上边代码即可