自定义导航栏后侧滑返回功能失效

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;
}

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