为NSNotification注册公告 [英] Registering a bool for a NSNotification

问题描述

我试图围绕NSNotification努力，但似乎无法使其正常工作.认为我误会了如何注册通知.

I'm trying to wrap my head around NSNotification but can't seem to get it to work. Think I'm misunderstanding how to register for an notification.

我在连接管理器类中有一个bool作为属性.初始化时，我通过几台服务器进行身份验证，并检查是否可以访问外部URL(应用程序将主要用于公司的Intranet，并且并不总是可以进行外部连接)

I have a bool as a property in my connection manager class. At initialisation I authenticate with a few servers and check if I can access an external URL (App will mainly be used on company intranet and an external connection isn't always possible)

如果BOOL属性无法访问连接，它将从YES更改为NO，并且由于可以随时响应，因此我认为最好在更改时注册通知.该属性称为externalConnectionAvailable

The BOOL property will be changed from YES to NO if it cannot access the connection and as this can be responded at any time I thought it would be best to register a notification for when it changes. The property is called externalConnectionAvailable

[ConnectionManager addObserver:self forKeyPath:@"externalConnectionAvailable" options:(NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld) context:NULL];

并具有方法:

-(void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    NSLog(@"observer called");
}

但是不会被调用.我在做些完全错误的事情吗?

But this doesn't get called. Am I doing something completely wrong?

谢谢

推荐答案

这很愚蠢.我只是通过调用externalConnectionAvailable而不是self.externalConnectionAvailable

It was something very stupid. I was just changing the property by calling externalConnectionAvailable not self.externalConnectionAvailable

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