iOS7以后的侧滑返回上一页

我们知道，iOS7以后，导航控制器默认带了侧滑返回功能，但是仅限于屏幕边缘。而且在你自定义leftBarButtonItem等之后侧滑效果就会消失。这种问题怎么解决呢？

首先，我们先来看看系统的这种手势是什么？

 NSLog(@"%@",self.interactivePopGestureRecognizer);//这里的self是项目中用的navigationController

打印结果：

<UIScreenEdgePanGestureRecognizer: 0x15ecc9e0; state = Possible; delaysTouchesBegan = YES; view = <UILayoutContainerView 0x15da65a0>; target= <(action=handleNavigationTransition:, target=<_UINavigationInteractiveTransition 0x15ecc900>)>>

解决办法：自定义一个滑动手势，当手势触发时，调用系统手势的target的相应方法。经过验证，这个target就是interactivePopGestureRecognizer.delegate，方法名是：handleNavigationTransition:

上代码：

    id taget = self.interactivePopGestureRecognizer.delegate;
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:taget action:@selector(handleNavigationTransition:)];
    [self.view addGestureRecognizer:pan];
    pan.delegate = self; //因为根控制器不需要滑动返回，所以要通过代理方法处理一下
    self.interactivePopGestureRecognizer.enabled = NO; //这句不能忘啊！！！！关掉系统手势

//手势代理方法

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{

    if (self.childViewControllers.count == 1) {

        return NO;

    }

    return YES;

}

参考资料

http://www.cocoachina.com/ios/20150401/11459.html

http://www.jianshu.com/p/737924684695

http://www.jianshu.com/p/c0b7a97b3b0e