NSCollectionView，imageview旋轉問題

我有NSCollectionView裏面的項目。我有xib NSCollectionViewItem，綁定到representObject.imageNSCollectionView，imageview旋轉問題

我的問題是以下。有時我的項目應該顯示「空白圖像」，直到我通過我的控制選擇圖像。當我選擇圖像 - 我將它存儲在representObject的.image屬性中，綁定更新視圖，一切都很酷。

我可以在集合中旋轉我的imageview。所有的工作都很酷，除了上面的情況，當我選擇圖像爲空時，視圖正在更新，綁定顯示正確的圖像，但如果我嘗試旋轉視圖後 - 它不能正常工作。它只在旋轉的地方顯示出來，但如果我旋轉到不同的角度 - 它會消失。 KVO正在觀察旋轉。

這是代碼我有：

class CollectionViewItem: NSCollectionViewItem { 

//Init 
override init?(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) { 
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil) 

    self.addObserver(self, forKeyPath: "modelRepresentation.Rotation", options: [.new, .old], context: nil) 
} 

required init?(coder: NSCoder) { 
    super.init(coder: coder) 
} 

//Properties 
@objc dynamic var modelRepresentation : Artwork? 

override var highlightState: NSCollectionViewItemHighlightState { 
    get { 
     return super.highlightState 
    } 
    set(newHighlightState) { 
     super.highlightState = newHighlightState 

     // Relay the newHighlightState to our AAPLSlideCarrierView. 
     guard let carrierView = self.view as? LibraryViewItemCarrierView else {return} 
     carrierView.highlightState = newHighlightState 
    } 
} 

override var isSelected: Bool { 
    get { 
     return super.isSelected 
    } 
    set { 
     super.isSelected = newValue 

     guard let carrierView = self.view as? LibraryViewItemCarrierView else {return} 
     carrierView.selected = newValue 
    } 
} 


override var representedObject: Any? { 
    get { 
     return super.representedObject as AnyObject? 
    } 
    set(newRepresentedObject) { 
     super.representedObject = newRepresentedObject 

     if let model = newRepresentedObject as? Artwork { 

      modelRepresentation = model 
      imageView?.rotate(byDegrees: CGFloat((model.Rotation))) 
     } 
    } 
} 

// 2 
override func viewDidLoad() { 
    super.viewDidLoad() 
    view.wantsLayer = true 
    view.layer?.backgroundColor = NSColor(red: 15/255, green: 34/255, blue: 42/255, alpha: 1).cgColor 
    view.layer?.borderWidth = 0.0 
    view.layer?.borderColor = NSColor.lightGray.cgColor 
} 

override func prepareForReuse() { 
    super.prepareForReuse() 
    imageView?.boundsRotation = 0 
} 

func setHighlight(_ selected: Bool) { 
    view.layer?.borderWidth = selected ? 3.0 : 0.0 
} 

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) { 

    let kind = change![NSKeyValueChangeKey.kindKey]! as! UInt 

    if(keyPath == "modelRepresentation.Rotation") 
    { 
     if kind == NSKeyValueChange.setting.rawValue { 
      guard let newVal = change![.newKey]! as? Int, 
       let oldVal = change![.oldKey]! as? Int else {return} 

      let delta = newVal - oldVal 
      imageView?.rotate(byDegrees: CGFloat(delta)) 
     } 
    } 
} 
}

來源

2017-08-25 PolosatiyVjih

哎呀，發現我的錯誤，上的CollectionView和CvItem一切正常。我只是在另一個地方設置了兩次圖像，這是一個問題。感謝所有瀏覽過該主題的人！

來源

2017-08-25 11:33:24 PolosatiyVjih

NSCollectionView，imageview旋轉問題

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