- [__ NSCFNumber count]：无法识别的选择器发送到Swift中的实例0x14539180

Question

我最近跳过使用Xcode7.3.1并转换我的代码，但我在这里遇到了一些问题，这就是我以前在Swift1.1中使用它的方法，但是我收到了错误

  

- [__ NSCFNumber count]：无法识别的选择器发送到实例0x14539180

这是我的代码：

func deleteData(modelName:String, predicate:String!) -> Bool {

  let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
  let cdhObj = appDelegate.cdh
  let fReq: NSFetchRequest = NSFetchRequest(entityName: modelName)
  print("\(fReq)")
  print("\(predicate)")

  //Check whether predicate is there
  if (predicate != nil) {
     fReq.predicate = NSPredicate(format:predicate)
     print("fReq.predicate-------\(fReq.predicate)")
  }

  print("Reached Here_1")
  print("Reached Here\(fReq.predicate!)")
  var result = try! cdhObj.managedObjectContext!.executeFetchRequest(fReq) //getting error in this line  
  print("Reached Here_2")

  for resultItem in result {
     let countryItem: AnyObject = resultItem

     cdhObj.managedObjectContext!.deleteObject(countryItem as! NSManagedObject)
  }
  cdhObj.saveContext(cdhObj.managedObjectContext!)

  result = try! cdhObj.managedObjectContext!.executeFetchRequest(fReq)
  if result.isEmpty {
     return true
  } else {
     return false
  }

 }

任何帮助都会得到赞赏!!

Answer 1

只需单击断点导航器左下角的[+]添加断点，然后尝试使用以下符号设置符号断点：

  

- [NSObject（NSObject）doesNotRecognizeSelector：]