自定义barbuttonitem后右滑返回失效解决办法——转载

我们在开发过程中都会或多或少的遇到过自定义"返回"按钮后系统返回手势无法响应的情况,下面做一总结:
在iOS7系统中，自带了可以通过右滑返回上一级页面的手势，如果仅仅修改leftBarButtonItem是无法响应这个手势的。可以在pushViewController之后加入如下代码：

    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];  
    //在自定义leftBarButtonItem后添加下面代码就可以完美解决返回手势无效的情况  
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {  
        self.navigationController.interactivePopGestureRecognizer.delegate = nil;  
    }  

可以通过下面方式进行返回的事件的捕捉：

    - (void)viewWillDisappear: (BOOL)animated  
    {  
        [super viewWillDisappear: animated];  
        if (![[self.navigationController viewControllers] containsObject: self])  
        {  
            // the view has been removed from the navigation stack, back is probably the cause  
            // this will be slow with a large stack however.  
        }  
    }  

至此，我们就完美解决了iOS7上使用leftBarButtonItem的滑动返回问题。
同时可以通过下面方式,来解决多次滑动之后会导致界面假死的情况：
在所有除一级页面之外的页面的viewDidAppear和viewWillDisappear中加入以下代码：

- (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;  
    }  
}  



- (void)viewDidAppear:(BOOL)animated {  
    [super viewDidAppear:animated];  
    //开启iOS7的滑动返回效果  
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {  
        //只有在二级页面生效  
        if ([self.navigationController.viewControllers count] == 2) {  
            self.navigationController.interactivePopGestureRecognizer.delegate = self;  
        }  
    }  
}  

同时在UINavigationcontroller的delegate中实现以下方法：

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {  
    //开启滑动手势  
    if ([navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {  
        navigationController.interactivePopGestureRecognizer.enabled = YES;  
    }  
}  

在pushviewcontroller之前加入以下代码：

if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {  
       self.navigationController.interactivePopGestureRecognizer.delegate = NO;  
   }  
   [self.navigationController pushViewController:viewController animated:YES];  

即可在实现滑动返回的同时，避免界面卡死的问题。

同时我们在应用中还会遇到一种情况:
在一个界面中会使用UIScrollView. 在这时,会阻挡系统的向右返回手势,可以通过下面方式解决:

- (void)viewDidLoad {  
    [super viewDidLoad];  
    .....  
    self.navigationController.interactivePopGestureRecognizer.delegate = self;  
}  

实现代理方法:

- (BOOL)gestureRecognizer:    (UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:  (UIGestureRecognizer *)otherGestureRecognizer  
{  
    [otherGestureRecognizer requireGestureRecognizerToFail:gestureRecognizer];  
    return NO;  
}  

当然不要忘记制空代理:<否则会崩溃>

- (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;  
    }  
}  

参考:
1: http://blog.csdn.net/zhaoxy_thu/article/details/15811189
2: http://ju.outofmemory.cn/entry/103566

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