ios - CFNotificationCenterRemoveEveryObserver 不删除观察者

我正在使用 CFNotificationCenterAddObserver() 函数来注册通知，如下所示

CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),
                                NULL,
                                ringerSwitched,
                                CFSTR("com.apple.springboard.ringerstate"),
                                NULL,
                                CFNotificationSuspensionBehaviorDeliverImmediately);

稍后我将通过 CFNotificationCenterRemoveEveryObserver() 函数将其删除，如下所示，但仍会调用回调方法。

CFNotificationCenterRemoveEveryObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL);

我也使用了CFNotificationCenterRemoveObserver()函数注销但是没用。

CFNotificationCenterRemoveObserver (CFNotificationCenterGetDarwinNotifyCenter(), NULL, CFSTR("com.apple.springboard.ringerstate"), NULL);

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Best Answer-推荐答案

为您的观察者提供标识符。

CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),
                            "observer identifier",
                            ringerSwitched,
                            CFSTR("com.apple.springboard.ringerstate"),
                            NULL,
                            CFNotificationSuspensionBehaviorDeliverImmediately);

CFNotificationCenterRemoveEveryObserver(CFNotificationCenterGetDarwinNotifyCenter(), @"observer identifier");

关于ios - CFNotificationCenterRemoveEveryObserver 不删除观察者，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30863121/