NSCollectionView，图像视图旋转问题

Question

我有NSCollectionView，里面有项目。 我有 xib for NSCollectionViewItem，绑定到 representObject.image

我的问题如下。有时我的项目应该显示"空图像"，直到我通过我的控件为此选择图像。当我选择图像时 - 我将其存储在 rerepresentationObject 的 .image 属性中，绑定更新视图，一切都很酷。

我可以在集合内旋转我的图像视图。 除了上述情况外，一切都很酷，当我为空图像选择图像时，视图正在更新，绑定显示正确的图像，但是如果我尝试在此之后旋转视图 - 它无法正常工作。它仅在添加它的旋转中显示，但是如果我旋转到不同的角度 - 它会消失。正在观察KVO的旋转。

这是我拥有的代码：

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))
}
}
}
}

Answer 1

哎呀，发现了我的错误，在 CollectionView 和 CvItem 上一切都很好。我只是在另一个地方设置了两次图像，这是一个问题。 感谢所有查看该主题的人！