ios8 滑动返回 ios7里面的方法不起作用了

Create custom UIBarButtonItem and then set it in your navigation controller

self.navigationItem.leftBarButtonItem = customBarItem;

必须用这个

下面的在 ios7下可以，ios8不行

- (void)viewWillDisappear:(BOOL)animated {  

 [super viewWillDisappear:animated];  

//代理置空，否则会闪退  

    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {              self.navigationController.interactivePopGestureRecognizer.delegate = nil;  

    }  

}