定義與先前的值衝突 - 此外，何時被覆蓋刪除？

Question

所以我試圖從一組cloudkit下載的項目中創建一個tableview。但是，我有這個簡單的小「定義衝突與前值」的錯誤。這個錯誤發生在cellForRowAtIndexPath函數中，這個函數與numberOfRowsInSection函數衝突。我試圖移動/刪除後一個函數的括號，並在最後放置一個問號/可選項...「 - > UITableViewCell？」無濟於事。錯誤從哪裏來？

另外，xcode刪除了每個tableview函數的覆蓋部分。它爲什麼有時會停留，什麼時候被刪除？

import UIKit 
import CloudKit 
class DiningTable: UITableViewController { 
var categories: Array<CKRecord> = [] 
override func viewDidLoad() { 
    super.viewDidLoad() 

func getRecords() 
    { 
     categories = [] 

     let publicDatabase = CKContainer.defaultContainer().publicCloudDatabase 

     let predicate = NSPredicate(value: true) 
     let query = CKQuery(recordType: "DiningTypes", predicate: predicate) 

     let queryOperation = CKQueryOperation(query: query) 
     queryOperation.desiredKeys = ["Name", "Address", "Picture"] 
     queryOperation.qualityOfService = .UserInteractive 
     queryOperation.recordFetchedBlock = { (record:CKRecord) -> Void in 
      let categoryRecord = record 
      self.categories.append(categoryRecord) 
    } 
     queryOperation.queryCompletionBlock = { (cursor:CKQueryCursor?, error: NSError?) -> Void in 
      if (error != nil) { 
       print("Failed to get data from iCloud - \(error!.localizedDescription)") 
       dispatch_async(dispatch_get_main_queue(), { 
        self.tableView.reloadData() 
       }) 
      } 
     } 
     publicDatabase.addOperation(queryOperation 
    } 

func tableView(tableView: UITableView, numberOfRowsInSection: Int) -> Int { 
     return self.categories.count 
    } 
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
    { 


     let cell = tableView.dequeueReusableCellWithIdentifier("dining") as! DiningTableCell 
     let restaurant: CKRecord = categories[indexPath.row] 
     cell.RestaurantName?.text = restaurant.valueForKey("Name") as? String 


     let img = restaurant.objectForKey("Picture") as! CKAsset 

     cell.RestaurantPhoto.image = UIImage(contentsOfFile: img.fileURL.path!) 


     return cell 
    } 
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    if segue.identifier == "segue1" {  
     if let destViewController = segue.destinationViewController as? RestaurantTable { 
      let indexPath = self.tableView.indexPathForSelectedRow! 
      destViewController.indexpath1 = indexPath 
     } 
    } 
    } 
func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 
} 
} 

Answer 1

你確定這是你的代碼或者你可能意外刪除了一些行嗎？

因爲，您的表視圖函數實際上嵌入在您的viewDidLoad函數中......它們需要是對象級函數。

注意你的代碼的縮進級別時，你有Xcode的縮進的代碼爲你（在屏幕上單擊鼠標右鍵，選擇結構 - >重新縮進。

import UIKit 
import CloudKit 

class DiningTable: UITableViewController { 
    var categories: Array<CKRecord> = [] 
    override func viewDidLoad() { 
     super.viewDidLoad() 
    } // <--- you are missing this close brace here. 

    func getRecords() 
    { 
     categories = [] 

     let publicDatabase = CKContainer.defaultContainer().publicCloudDatabase 

     let predicate = NSPredicate(value: true) 
     let query = CKQuery(recordType: "DiningTypes", predicate: predicate) 

     let queryOperation = CKQueryOperation(query: query) 
     queryOperation.desiredKeys = ["Name", "Address", "Picture"] 
     queryOperation.qualityOfService = .UserInteractive 
     queryOperation.recordFetchedBlock = { (record:CKRecord) -> Void in 
      let categoryRecord = record 
      self.categories.append(categoryRecord) 
     } 
     queryOperation.queryCompletionBlock = { (cursor:CKQueryCursor?, error: NSError?) -> Void in 
      if (error != nil) { 
       print("Failed to get data from iCloud - \(error!.localizedDescription)") 
       dispatch_async(dispatch_get_main_queue(), { 
        self.tableView.reloadData() 
       }) 
      } 
     } 
     publicDatabase.addOperation(queryOperation) 
    } 

    override func tableView(tableView: UITableView, numberOfRowsInSection: Int) -> Int { 
     return self.categories.count 
    } 

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
    { 
     let cell = tableView.dequeueReusableCellWithIdentifier("dining") as! DiningTableCell 
     let restaurant: CKRecord = categories[indexPath.row] 
     cell.RestaurantName?.text = restaurant.valueForKey("Name") as? String 


     let img = restaurant.objectForKey("Picture") as! CKAsset 

     cell.RestaurantPhoto.image = UIImage(contentsOfFile: img.fileURL.path!) 


     return cell 
    } 

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
     if segue.identifier == "segue1" { 
      if let destViewController = segue.destinationViewController as? RestaurantTable { 
       let indexPath = self.tableView.indexPathForSelectedRow! 
       destViewController.indexpath1 = indexPath 
      } 
     } 
    } 

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

Answer 2

整個班級的定義是嵌套的

override func viewDidLoad() { 

函數內。在打電話給super.viewDidLoad（）後加上一個大括號。