swift - 无法在swift中的 View Controller 和表 View Controller 之间发送int值

类首选项viewcontroller通过prepare for segue发送nil，无论是否执行ibactions。似乎我在准备赛格时出了点问题，但我不确定。我没有试图分配给任何标签或任何东西，我只是试图将int值发送给类pick2_1中的另一个变量。非常感谢。
导入uikit

class PreferencesViewController: UIViewController {
    var preference = 0


@IBAction func nImportant(sender: UIButton) {
    preference = -1
    print(preference)
}

@IBAction func N(sender: UIButton) {
    preference = 0
    print(preference)

}

@IBAction func mImportant(sender: UIButton) {
    preference = 1
    print(preference)

}


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}



override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if segue.identifier == "preferenceSegue" {
        let preferenceVC = segue.destinationViewController as! Pick2_1
        preferenceVC.preferenceSent = preference
        print(preference)


    }
}
}

最佳答案

OK SEgue直接连接到按钮。您必须在两个控制器之间设置segue设置标识符，在@ibaction中，您应该调用performseguewithidentifier func