ios侧滑返回：完美解决 interactivePopGestureRecognizer 卡住的

苹果一直都在人机交互中尽力做到极致，在iOS7中，新增加了一个小小的功能，也就是这个api：self.navigationController.interactivePopGestureRecognizer.enabled = YES;

这个api功能就是在NavigationController堆栈内的UIViewController可以支持右滑手势，也就是不用点击右上角的返回按钮，轻轻在屏幕左边一

滑，屏幕就会返回，随着ios设备屏幕的增大，这个小功能让手指短，拇指大和手残人士看到了福音。

这个功能是好，但是经常我们会有需求定制返回按钮，如果手动定制了返回按钮，这个功能将会失效，也就是自定义了navigationItem的leftBarButtonItem，那么这个手势就会失效。解决方法找到两种 

 1.重新设置手势的delegate

 self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;

 2.当然你也可以自己响应这个手势的事件

 [self.navigationController.interactivePopGestureRecognizer addTarget:self action:@selector(handleGesture:)];

有更多方法以后继续补充，这里可以根据自己需要进行选择，如果只是简单定制了返回按钮，第一种最简单，一句代码搞定。

interactivePopGestureRecognizer是iOS7推出的解决VeiwController滑动后退的新功能,虽然很实用,但是坑也很多啊（比如在rootViewcontroller下，使用侧滑返回手势，可能就卡住了）,这里给出如何完美解决interactivePopGestureRecognizer卡住的问题.

当然我们要自定义UINavigationController来解决这个问题:

#import "MMNavController.h"@interface MMNavController (){    }@end@implementation MMNavController- (id)initWithRootViewController:(UIViewController *)rootViewController{    self = [super initWithRootViewController:rootViewController];    if (self) {        // Custom initialization            }    return self;}- (void)viewDidLoad{        __weak MMNavController *weakSelf = self;        if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])    {        self.interactivePopGestureRecognizer.delegate = weakSelf;                self.delegate = weakSelf;    }    }- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{        if ( [self respondsToSelector:@selector(interactivePopGestureRecognizer)]  animated == YES )    {        self.interactivePopGestureRecognizer.enabled = NO;    }        [super pushViewController:viewController animated:animated];    }- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated{    if ( [self respondsToSelector:@selector(interactivePopGestureRecognizer)]  animated == YES )    {        self.interactivePopGestureRecognizer.enabled = NO;    }        return  [super popToRootViewControllerAnimated:animated];    }- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated { 

if( [self respondsToSelector:@selector(interactivePopGestureRecognizer)] ) { 

self.interactivePopGestureRecognizer.enabled = NO; 

} 

return [super popToViewController:viewController animated:animated]; } 

#pragma mark UINavigationControllerDelegate 

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController

 animated:(BOOL)animate { 

if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) 

{ self.interactivePopGestureRecognizer.enabled = YES; } 

} 

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

if ( gestureRecognizer ==self.interactivePopGestureRecognizer ) { 

if ( self.viewControllers.count 2 || self.visibleViewController == [self.viewControllers objectAtIndex:0] )

{ return NO; } 

} return YES; 

} @end