重新加載表格視圖後的加料運動

Question

每次我重新加載我的行並向上滾動時，我都會收到奇怪的加速運動。如果向下滾動，這很好，但滾動備份會導致可怕的抖動效果，導致該應用無用。

我附上的不僅是cellforrowatindex路徑的代碼，還有按鈕。爲行

細胞：

override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!, object: PFObject!) -> PFTableViewCell! { 
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! TableViewCell 
    cell.nopebutton.tag = indexPath.row 
    cell.nicebutton.tag = indexPath.row 
    cell.killText.text = object.valueForKey("text") as! String 
    cell.layoutMargins = UIEdgeInsetsZero 
    cell.killText.numberOfLines = 0 
    let score = object.valueForKey("count") as! Int 
    cell.count.text = "\(score)" 
    if cell.count.text == "\(0)" 
    { 
     cell.count.textColor = UIColor.grayColor() 
    } 
    if cell.count.text > "\(0)" 
    { 
     cell.count.textColor = UIColor(red: 42.0/255, green: 204.0/255, blue: 113.0/255, alpha: 1) 
    } 
    if cell.count.text < "\(0)" 
    { 
     cell.count.textColor = UIColor(red: 231.0/255, green: 76.0/255, blue: 50.0/255, alpha: 1) 
    } 
    if cell.count.text == "\(50)" 
    { 
     cell.count.textColor = UIColor(red: 249.0/255, green: 191.0/255, blue: 59.0/255, alpha: 1) 
    } 


    if let dict : NSDictionary = NSUserDefaults.standardUserDefaults().objectForKey("userNiceNopeDictionary") as? NSDictionary { 
     cell.nicebutton.enabled = true 
     cell.nopebutton.enabled = true 
     if let nice = dict[object.objectId] as? Bool{ 
      if nice { 
       cell.nicebutton.enabled = false 
      } 
      else { 
       cell.nopebutton.enabled = false 
      } 
     } 
    } 

    let dateUpdated = object.createdAt as NSDate 
    let dateFormat = NSDateFormatter() 
    dateFormat.dateFormat = "h:mm a" 
    cell.time.text = (NSString(format: "%@", dateFormat.stringFromDate(dateUpdated)) as String) as String 
    let replycnt = object.objectForKey("replies") as! Int 

    if cell.count.text == "\(-10)" 
    { 
     object.deleteInBackground() 
    } 


    return cell 

} 

按鈕

@IBAction func topButton(sender: AnyObject) { 

    var button = sender as! UIButton 
//  var view = button.superview 
//   
//  var otherButton = view?.viewWithTag(102) as! UIButton 
//  var label = button.superview!.viewWithTag(110) as! UILabel 
//  otherButton.enabled = true 
//  button.enabled = false 

    var rowNumber = button.tag 

    var mutableDict = NSMutableDictionary() 
    if let dict = NSUserDefaults.standardUserDefaults().objectForKey("userNiceNopeDictionary") { 
     mutableDict = dict.mutableCopy() as! NSMutableDictionary 
    } 

    let obj = self.objects[rowNumber] as! PFObject 

    mutableDict.setValue(true, forKey: obj.objectId) 
    NSUserDefaults.standardUserDefaults().setObject(mutableDict, forKey: "userNiceNopeDictionary") 
    NSUserDefaults.standardUserDefaults().synchronize() 
    let hitPoint = sender.convertPoint(CGPointZero, toView: self.tableView) 
    let hitIndex = self.tableView.indexPathForRowAtPoint(hitPoint) 
    let object = objectAtIndexPath(hitIndex) 
    object.incrementKey("count") 
    //label.text = object.objectForKey("count") as! String 
//  self.tableView.reloadData() 
    object.save() 
    self.tableView.reloadRowsAtIndexPaths([hitIndex!], withRowAnimation: UITableViewRowAnimation.None) 
} 


@IBAction func bottomButton(sender: AnyObject) { 

    var button = sender as! UIButton 
    var rowNumber = button.tag 

    var mutableDict = NSMutableDictionary() 
    if let dict = NSUserDefaults.standardUserDefaults().objectForKey("userNiceNopeDictionary") { 
     mutableDict = dict.mutableCopy() as! NSMutableDictionary 
    } 

    let obj = self.objects[rowNumber] as! PFObject 

    mutableDict.setValue(false, forKey: obj.objectId) 
    NSUserDefaults.standardUserDefaults().setObject(mutableDict, forKey: "userNiceNopeDictionary") 
    NSUserDefaults.standardUserDefaults().synchronize() 

    let hitPoint = sender.convertPoint(CGPointZero, toView: self.tableView) 
    let hitIndex = self.tableView.indexPathForRowAtPoint(hitPoint) 
    let object = objectAtIndexPath(hitIndex) 
    object.incrementKey("count", byAmount: -1) 
    self.tableView.reloadRowsAtIndexPaths([hitIndex!], withRowAnimation: UITableViewRowAnimation.None) 
    object.save() 

} 
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    if(segue.identifier == "killDetail"){ 
     let indexPath = self.tableView.indexPathForSelectedRow() 
     let obj = self.objects[indexPath!.row] as! PFObject 
     let detailVC = segue.destinationViewController as! DetailViewController 
     detailVC.kill = obj 
    } 
} 

} 

我的印象是，有一個在我的高度的問題，所以我已經提供了一個代碼以及下。

override func viewDidLoad() { 
    super.viewDidLoad() 
    self.tableView.separatorInset = UIEdgeInsetsZero 
    self.tableView.separatorInset = UIEdgeInsetsMake(0, 0, 0, 0) 
    self.tableView.separatorColor = UIColor(red: 236.0/255, green: 240.0/255, blue: 241.0/255, alpha: 1) 
    navigationController?.tabBarController?.tabBar.hidden = true 
    tabBarController?.tabBar.hidden = true 
    self.tableView.estimatedRowHeight = 60 
    self.tableView.rowHeight = UITableViewAutomaticDimension 
    locationManager.desiredAccuracy = 1000 
    locationManager.delegate = self 
    locationManager.requestWhenInUseAuthorization() 
    locationManager.startUpdatingLocation() 
} 

我不能爲我的生活弄清楚發生了什麼事情導致這個混蛋。就像我說的，我認爲它可能與行高的自動維度有關，但是當我改變時，問題仍然很明顯。

Answer 1

1. 不要每次出列單元時都從用戶默認值讀取字典。做一次，在tableView(cellForRowAtIndexPath:之外。在viewDidLoad什麼的。一旦它存儲在內存中，從字典中選出一個元素是沒問題的，但是......每當一個單元格出列時，你只是不想從磁盤讀取數據（或者我猜）。

   如果由於某種原因而在其他地方更改詞典並希望保持一致的狀態，請立即閱讀詞典並在控制器/視圖控制器之間傳遞（例如通過prepareForSegue）並寫入它更改爲用戶默認值。

2. 日期格式化程序可能不是那麼大或複雜的一個對象，但你只需要創建一個，然後可以重用它，所以我建議你也只創建一個。

編輯：如果您只是向上滾動時出現問題，則可能是估計的行高與實際行高不匹配。嘗試刪除估計的高度。