- [__ NSCFNumber count]：在Swift中發送到實例0x14539180的無法識別的選擇器

Question

我最近跳轉到使用Xcode7.3.1並轉換我的代碼，但是我在這裏遇到了一些問題，這就是我以前如何使用它Swift1.1但我得到錯誤

- [__ NSCFNumber計數]：無法識別的選擇發送到實例0x14539180

這裏是我的代碼：

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^ h elp會被讚賞!!

Answer 1

只需點擊[+]在斷點導航器的左下角添加斷點和嘗試設置一個象徵性的轉折點所：

- [NSObject的（NSObject的）doesNotRecognizeSelector：]