从iOS7开始，系统为UINavigationController提供了一个interactivePopGestureRecognizer用于右滑返回(pop),但是，如果自定了当前视图控制器leftBarButtonItem，该手势就失效了。
解决方法：自定义UINavigationController，实现其代理方法:
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated;
如果push的是非根控制器，设置self.interactivePopGestureRecognizer.delegate = nil;。
如果是根控制器，将原来的代理重新设置即可。
具体代码如下：
#import "LGNavigationController.h"
@interface LGNavigationController ()<UINavigationControllerDelegate>
@property (nonatomic,strong) id popDelegate;
@end
- (void)viewDidLoad {
[super viewDidLoad];
//代理
self.popDelegate = self.interactivePopGestureRecognizer.delegate;
self.delegate = self;
}
#pragma UINavigationControllerDelegate方法
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
//实现滑动返回功能
//清空滑动返回手势的代理就能实现
self.interactivePopGestureRecognizer.delegate = viewController == self.viewControllers[0]? self.popDelegate : nil;
}
