无法识别的选择器发送到实例 Swift 2.1

Posted 2023-03-12

【中文标题】无法识别的选择器发送到实例 Swift 2.1

【英文标题】：Unrecognized selector sent to instance Swift 2.1

【发布时间】：2016-05-13 18:47:54

【问题描述】：

每次保存任务时，以下代码都会导致崩溃。新数据需要输入到Detail View控制器并保存。这有效，但应用程序每次都会终止。请告诉我为什么这不起作用：

代码：

var detailViewController: DetailViewController? = nil
var managedObjectContext: NSManagedObjectContext? = nil


override func viewDidLoad() 
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.leftBarButtonItem = self.editButtonItem()

    let addButton = UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "addNewCourseWork")
    self.navigationItem.rightBarButtonItem = addButton
    if let split = self.splitViewController 
        let controllers = split.viewControllers
        self.detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? DetailViewController
    

    //hide blank cells
    let backgroundView = UIView(frame: CGRectZero)
    tableView.tableFooterView = backgroundView

    // register  for receiving notification, I need to update detail view from this exact same class, not just any MasterView class instance...
    NSNotificationCenter.defaultCenter().addObserver(self, selector:"MasterViewController.pushNewValuesToDetail", name: "updateDetailTableValues", object: nil)


func pushNewValuesToDetail() 
    self.performSegueWithIdentifier("showDetail", sender: nil)

错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '- MasterViewController.pushNewValuesToDetail]: unrecognized selector sent to instance 0x7fc622d1b820

【问题讨论】：

unrecognized selector sent to instance的可能重复

如果问题已解决，请随时将问题标记为已解决。

【参考方案1】：

试试

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(pushNewValuesToDetail), name: "updateDetailTableValues", object: nil)

不需要注意基类，新的创建选择器的方法（在Xcode最新版本中）是#selector。