ios - NSNotificationCenter 发送到实例的无法识别的选择器

Question

当我想通过 NSNotificationCenter 更新标签时出现运行时错误，但我不知道为什么。选择器的名称相同。

ViewController2

@IBAction func saveSettings(sender: UIButton) {
    NSNotificationCenter.defaultCenter().postNotificationName("TimeRepairID", object: nil)
}

View Controller

    override func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "setTimeRepair", name: "TimeRepairID", object: nil)  
}

func setTimeRepair(notification: NSNotification){
    CurrentTimerepair.text = String(format:"%.1f", RepairTime.sharedInstance.TimeOfRepair())
    RFPTime.text = String(RepairTime.sharedInstance.ReadyForPickup())
}

所以每次我在 ViewController2 中按下保存按钮时，应用程序崩溃，无法识别的选择器发送到实例 0x13e63bd40 知道任何

Answer 1

当您将 NSNotification 作为参数传递时，您在选择器名称之后错过了 :。

override func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "setTimeRepair:", name: "TimeRepairID", object: nil)
}

func setTimeRepair(notification: NSNotification){
    CurrentTimerepair.text = String(format:"%.1f", RepairTime.sharedInstance.TimeOfRepair())
    RFPTime.text = String(RepairTime.sharedInstance.ReadyForPickup())
}