使用 NSNotificationCenter 时出现错误“执行被中断，原因：信号 SIGABRT”

Question

我对 swift 还很陌生，并且一直在操场上玩 NSNotificationCenter。我收到了错误：

执行被中断，原因：signal SIGABRT

使用postNotificationName 函数时。我无法弄清楚问题发生的确切原因，任何指针都会有所帮助！

let notificationKey = "rachel"

class FirstViewController {

    var sentNotificationLabel = "Nothing has been sent yet."

    func addObserver() {

        NSNotificationCenter.defaultCenter().addObserver(self, selector: "updateNotificationLabel", name: notificationKey, object: nil)
    }

    func notify() {

        NSNotificationCenter.defaultCenter().postNotificationName(notificationKey, object: self)
    }

    func updateNotificationLabel() {

        self.sentNotificationLabel = "Notification sent!"
    }
}



class SecondViewController {

    var notificationLabel = "I have not been notified yet."

    func addObserver() {

        NSNotificationCenter.defaultCenter().addObserver(self, selector: "updateNotificationLabel", name: notificationKey, object: nil)
    }

    func updateNotificationLabel() {

        self.notificationLabel = "I've been notified!"
    }

    deinit {

        NSNotificationCenter.defaultCenter().removeObserver(self)
    }
}


class ThirdViewController {

    var notificationLabel = "I have not been notified yet."

    func addObserver() {

        NSNotificationCenter.defaultCenter().addObserver(self, selector: "updateNotificationLabel", name: notificationKey, object: nil)
    }

    func updateNotificationLabel() {

        self.notificationLabel = "I've been notified too!"
    }

    deinit {

        NSNotificationCenter.defaultCenter().removeObserver(self)
    }
}



var firstView = FirstViewController()
print(firstView.sentNotificationLabel) // Nothing has been sent yet.
firstView.addObserver()
firstView.updateNotificationLabel()
firstView.notify() // ERROR 'Execution was interrupted, reason: signal SIGABRT'
print(firstView.sentNotificationLabel) // Notification sent!

var secondView = SecondViewController()
print(secondView.notificationLabel)

var thirdView = ThirdViewController()
print(thirdView.notificationLabel)

Answer 1

尝试使三个类符合NSObject...您不能将 NSNotificationCenter 与纯粹的 swift 对象一起使用。

IE：class FirstViewController: NSObject {}