在使用手勢識別器添加子視圖時遇到用戶界面故障

我正在開發一個應用程序，用戶通過「卡片」進行滑動，這些卡片基本上是用API中的數據填充的UIViews。在使用手勢識別器添加子視圖時遇到用戶界面故障

當應用第一次打開時，卡片被創建並作爲子視圖添加到超級視圖。每次用戶刷卡時，該卡都將從超級視圖中移除。

當用戶刷卡時，會在後臺創建並緩存更多卡片。

當用戶在最後一張卡片上時，我將緩存的卡片添加到當前正在顯示的卡片背後的超級視圖。

問題是，當卡被添加到超級視圖時，我的手勢識別器停止工作/毛刺（用戶不能滑動）。幾秒鐘後，它再次開始工作，用戶可以滑動。

如何阻止識別器發生故障？任何洞察力將不勝感激。

謝謝！

下面是一個創建/添加卡 //創建卡 FUNC createCards（新華美通：布爾）代碼{

APICall.begin() { (info) in 

     DispatchQueue.main.async { 
      for i in info { 

       let frontView = frontView() 
       let backView = backView() 

       // Set up front and back views 
       self.viewSetup(view: frontView) 
       self.viewSetup(view: backView) 

       // Set up card view 
       let view = cardView(frame: frame) 
       view.addSubview(backView) 
       view.addSubview(frontView) 
       self.viewSetup(view: view) 
       view.isHidden = true 

       // function that add recognizer 
       self.dragging(view: view) 

       // cacheCard 
       if !firstCall{ 
        self.cache.add(cardView: view) 
       // add to view 
       }else{ 
        self.view.addSubview(view) 
       } 

      } 

      // Reveal current card 
      if firstCall { 
       self.view.subviews.last?.isHidden = false 
      } 

      print("DONE") 
     } 
    } 

}

繼承人是添加識別代碼/添加緩存

// dragging gesture helper 
func draggig(card: view){ 
    let gesture = UIPanGestureRecognizer(target: self, action: #selector(ViewController.wasDragged(_:))) 
    view.addGestureRecognizer(gesture) 
    view.isUserInteractionEnabled = true 

} 

// dragged gestrues 
func wasDragged(_ gesture: UIPanGestureRecognizer){ 

    // Only allow dragging when front is showing 
    if(showingFront){ 

     // Dragging code 
     let helper = draggingBeganHelper(gesture: gesture) 
     let card:UIView = helper[0] as! UIView 
     var rotation:CGAffineTransform = helper[1] as! CGAffineTransform 
     var stretch:CGAffineTransform = helper.last as! CGAffineTransform 

     if gesture.state == UIGestureRecognizerState.ended { 

      rotation = CGAffineTransform(rotationAngle: 0) 
      stretch = rotation.scaledBy(x: 1, y: 1) 

      //Remove card from superview 
      card.removeFromSuperview() 

      // Store cards in cache 
      if(self.view.subviews.count == lastCardIndex + cardOffset){ 

       createCards(false) 

      } 

      // When at the second to last card 
      else if self.view.subviews.count == lastCardIndex+1{ 
       if cardCacheArray.isEmpty { 
        createCards(true) 
       } 
       else{ 
        DispatchQueue.main.async { 
         for i in cardCacheArray{ 
          self.view.insertSubview(i, belowSubview: self.view.subviews[lastCardIndex]) 
         } 
         self.cache.empty() 
        } 
       } 
      } 
     } 
    } 

} 

func draggingBeganHelper(gesture: UIPanGestureRecognizer) -> [AnyObject]{ 
    // Card dragging gesture setup 
    let translation = gesture.translation(in: self.view) 
    let card = gesture.view 
    card?.center = CGPoint(x: (card?.center.x)! + translation.x, y: (card?.center.y)! + translation.y) 
    let xFromCenter = (card?.center.x)! - self.view.bounds.width/2 
    let scale = min(100/abs(xFromCenter),1) 
    let rotation = CGAffineTransform(rotationAngle: xFromCenter/200) 
    let stretch = rotation.scaledBy(x: scale, y: scale) 
    card?.transform = stretch 

    return [card!,rotation as AnyObject,stretch as AnyObject] 
}

來源

2016-12-03 Orr Yakobi

因爲事情工作（但最終）的方式，你可能意味着你已經編寫了「基準線」的權利。如果您可以發佈一些代碼供我們查看，這將有所幫助。 – dfd

@dfd添加了代碼 –

想通了。一次加載太多的UIViews。更好和更順利的臨近者將是不斷回收兩個UIViews

來源

2016-12-08 04:49:58

在使用手勢識別器添加子視圖時遇到用戶界面故障

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