Question

我使用addObserver API接收通知：

NSNotificationCenter.defaultCenter().addObserver(self, selector: "methodOFReceivedNotication:", name:"NotificationIdentifier", object: nil)

我的方法是：

func methodOFReceivedNotication(notification: NSNotification){
//Action take on Notification
}

是的，它有效！但是我将方法methodOFReceivedNotication更改为私有：

private func methodOFReceivedNotication(notification: NSNotification){
//Action take on Notification
}

xCode向我发送错误：unrecognized selector sent to instance

如何在目标为self时调用私有方法？我不想将methodOFReceivedNotication方法暴露给任何其他方法。

Answer 1

只需使用dynamic修饰符进行标记，或在方法声明中使用@objc属性

dynamic private func methodOFReceivedNotication(notification: NSNotification){
    //Action take on Notification
}

或

@objc private func methodOFReceivedNotication(notification: NSNotification){
    //Action take on Notification
}

Answer 2

您是否考虑过使用-addObserverForName:object:queue:usingBlock:？

NSNotificationCenter.defaultCenter().addObserverForName("NotificationIdentifier", object: nil, queue: nil, usingBlock: {
    [unowned self] note in
    self.methodOFReceivedNotication(note)
})

或者不是调用私有方法，只是执行操作。

NSNotificationCenter.defaultCenter().addObserverForName("NotificationIdentifier", object: nil, queue: nil, usingBlock: {
    [unowned self] note in
    // Action take on Notification
})

NSNotificationCenter在Swift中添加addObserver，同时调用私有方法

2 个答案: