iOS7之后苹果导航控制器增加了一个左侧边缘右滑pop的手势，在非栈底的控制器里面，从左边右滑之后相当于出栈（pop）样子。
以下设置均在自定义的UINavigationController里操作
// 默认是YES 设置为NO左侧右滑手势就不可用了
self.interactivePopGestureRecognizer.enabled = YES;
也可以通过手势实现右滑
遵守UIGestureRecognizerDelegate协议，设置代理对象，实现一下代理方法即可：
-(void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.navigationController.interactivePopGestureRecognizer.delegate = self;
}
#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
if (self.viewControllers.count <= 1) {
return NO;
}
return YES;
}
个人的记忆方法：
backBarButtonItem设置下一个页面的返回按钮
leftBarButtonItem设置当前页面的返回按钮
项目中我们多数会自定义左侧返回按钮leftBarButtonItem，这个时候就算设置self.interactivePopGestureRecognizer.enabled = YES了或者实现手势的代理，左边缘的右滑动手势依旧会失效，例如如下代码写过之后，可以验证一下，失效了。
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (self.viewControllers.count > 0) {
/* 不是栈底控制器的时候隐藏tabbar */
viewController.hidesBottomBarWhenPushed = YES;
// 设置左边的返回按钮leftBarButtonItem
UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
backBtn.frame = CGRectMake(0, 0, 44, 44);
backBtn.imageView.contentMode = UIViewContentModeCenter;
backBtn.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 34);
[backBtn setImage:[UIImage imageNamed:@"rrrr"] forState:UIControlStateNormal];
[backBtn setImage:[UIImage imageNamed:@"rrrr"] forState:UIControlStateHighlighted];
[backBtn addTarget: self action: @selector(back) forControlEvents: UIControlEventTouchUpInside];
UIBarButtonItem *backBtnItem=[[UIBarButtonItem alloc]initWithCustomView:backBtn];
viewController.navigationItem.leftBarButtonItem = backBtnItem;
// 此处改为设置backBarButtonItem 右滑手势可以用，但自定义按钮不展示！！
}
[super pushViewController:viewController animated:animated];
}
按照如下方式设置backBarButtonItem或leftBarButtonItem，其他不做任何设置，右滑效果可用：
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (self.viewControllers.count > 0) {
/* 不是栈底控制器的时候隐藏tabbar */
viewController.hidesBottomBarWhenPushed = YES;
}
[self.navigationBar setBackIndicatorImage:[UIImage imageNamed:@"rrrr"]];
[self.navigationBar setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"rrrr"]];
UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
self.navigationItem.backBarButtonItem = backItem;
[super pushViewController:viewController animated:animated];
}
