NetServiceBrowser 删除后会提供不同的 NetService

发布于 2024-12-20 15:08:39 字数 413 浏览 1 评论 0原文

我希望做这样的事情：

在 netServiceBrowser:didFindService:moreComing:

[self.foundServices addObject:aNetService];

和 netServiceBrowser:didRemoveService:moreComing:

[self.foundServices removeObject:aNetService];

但是，返回的服务不会被 NetServiceBrowser 保留，因此 didRemoveService 中给出的服务与数组中的服务不是同一对象。如何比较服务以确保我删除的服务是正确的？

原文

I was hoping to do something like this:

In netServiceBrowser:didFindService:moreComing:

[self.foundServices addObject:aNetService];

And in netServiceBrowser:didRemoveService:moreComing:

[self.foundServices removeObject:aNetService];

However, the services returned aren't retained by the NetServiceBrowser, and so the service given in didRemoveService isn't the same object as those in the array. How do I compare the services to ensure that the one I remove is the correct one?

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铁憨憨 2024-12-27 15:08:39

你想得太多了，在你的头脑中制造了一个不存在的问题。对传递到 didRemoveService: 的对象使用 removeObject:。 removeObject: 根据对象对 isEqual: 的响应进行删除，而不是根据对象的地址或身份。所以这会起作用。

答案确实很简单：

[self.foundServices removeObject:aNetService];

Apple 对 removeObject: 的描述解释了这一点：

此方法使用 indexOfObject: 来定位匹配项，然后使用 removeObjectAtIndex: 删除它们。因此，匹配是根据对象对 isEqual: 消息的响应来确定的。

（为了完整起见，Apple确实提供了一个通过地址删除对象的函数。这就是removeObjectIdenticalTo：。但是，这不是您想要的行为。只需使用removeObject ：。）

参考文献：

You're over-thinking this, and creating a problem in your head that doesn't exist. Use removeObject: on the object passed into didRemoveService:. removeObject: removes based on the object's response to isEqual:, not the address or identity of the object. So this will just work.

The answer really is as simple as:

[self.foundServices removeObject:aNetService];

Apple's description of removeObject: explains this:

This method uses indexOfObject: to locate matches and then removes them by using removeObjectAtIndex:. Thus, matches are determined on the basis of an object’s response to the isEqual: message.

(For completeness, Apple does offer a function that removes an object by address. That's removeObjectIdenticalTo:. That's not the behaviour you want here, however. Just use removeObject:.)

References:

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因为看清所以看轻 2024-12-27 15:08:39

简短的回答，我最终不得不使用这个，但我无法再重现这个问题。使用所选答案。

- (void)netServiceBrowser:(NSNetServiceBrowser *)aNetServiceBrowser didFindService:(NSNetService *)aNetService moreComing:(BOOL)moreComing {
    [self.foundServices addObject:aNetService];
}


- (void)netServiceBrowser:(NSNetServiceBrowser *)aNetServiceBrowser didRemoveService:(NSNetService *)aNetService moreComing:(BOOL)moreComing {
    NSNetService *found = nil;

    for(NSNetService *ns in self.foundServices) {
        if([ns isEqualTo:aNetService]) {
            found = ns;
        }
    }

    if(found) {
        [self.foundServices removeObject:found];
    }
}

Short answer, I ended up having to use this, but I can't reproduce the problem anymore. Use the selected answer.

- (void)netServiceBrowser:(NSNetServiceBrowser *)aNetServiceBrowser didFindService:(NSNetService *)aNetService moreComing:(BOOL)moreComing {
    [self.foundServices addObject:aNetService];
}


- (void)netServiceBrowser:(NSNetServiceBrowser *)aNetServiceBrowser didRemoveService:(NSNetService *)aNetService moreComing:(BOOL)moreComing {
    NSNetService *found = nil;

    for(NSNetService *ns in self.foundServices) {
        if([ns isEqualTo:aNetService]) {
            found = ns;
        }
    }

    if(found) {
        [self.foundServices removeObject:found];
    }
}

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