使用addObserverForName时删除Observer：usingBlock [英] Remove Observer when using addObserverForName:usingBlock

问题描述

我有以下代码在加载视图时添加一个观察者。

I have the following code that adds an observer in the loading of the view.

- (void)viewDidLoad
{
    [super viewDidLoad];

    [[NSNotificationCenter defaultCenter] addObserverForName:@"com.app.livedata.jsonupdated"
                                                      object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *notif) {
                                                          NSLog(@"JSONUPDATED");
                                                      }];
}

这就好了。但是当卸载视图并确认调用dealloc时，Notification仍在触发。

And this fires fine. However when the view is unloaded and I confirm the dealloc is called the Notification is still firing.

似乎没有停用此观察者的方法？

There doesn't seem to be a method for deactivating this observer?

推荐答案

似乎解决方案是在视图中跟踪对象，然后您可以在dealloc方法中引用它。

Seems the solution is to track the object in the View and then you can reference it in the dealloc methods.

 id observer = [[NSNotificationCenter defaultCenter] addObserverForName: /* ... */ ];

然后删除如下：

[[NSNotificationCenter defaultCenter] removeObserver:observer];
observer = nil;

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