问题描述
每当属性字符串超出特定范围时，我都会尝试将新的 NSTextView 添加到我的集合视图中的最后一个索引。代码运行完美，直到第 5 个项目然后它开始它每次按下 Enter 按钮时开始创建一个项目。我认为这是一个错误，但我不确定。如果有人可以向我展示更好的方法或改进我拥有的当前代码，我将不胜感激。下面是我的代码：
这是 CollectionViewItem
class DocumentItem: NSCollectionViewItem {
var itemView: DocumentTextView?
override func viewDidLoad() {
super.viewDidLoad()
self.itemView?.wantsLayer = true
// Do view setup here.
}
override func loadView() {
self.itemView = DocumentTextView(frame: NSZeroRect)
self.view = self.itemView!
}
func getView() -> DocumentTextView {
return self.itemView!
}
}
这里是 collectionView 数据源
func collectionView(_ collectionView: NSCollectionView,numberOfItemsInSection section: Int) -> Int {
return DocList.count
}
func collectionView(_ collectionView: NSCollectionView,itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
let item = collectionView.makeItem(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "DocumentItem"),for: indexPath)
return item
}
这里是 NSTextView 子类
class DocumentTextView: NSTextView {
var theContainer = NSTextContainer()
var theStorage = NSTextStorage()
var theManager = NSLayoutManager()
var table = NSTextTable()
var pdfPage: PDFPage?
override init(frame frameRect: NSRect) {
super.init(frame: NSRect(origin: frameRect.origin,size: NSSize(width: 800,height: 1131 )),textContainer: theContainer)
theStorage.addLayoutManager(theManager)
theManager.addTextContainer(theContainer)
self.textContainerInset = CGSize(width: 50,height: 50)
self.textContainer?.widthTracksTextView = true
self.textContainer?.heightTracksTextView = true
self.textContainer?.lineBreakMode = .byWordWrapping
self.maxSize = NSSize(width: 800,height: 1131)
self.backgroundColor = NSColor.fromHexString("ffffff")!
self.isRichText = true
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
这是带来bug的函数
func textDidChange(_ notification: Notification) {
var textView = notification.object as? DocumentTextView
let numberOfItems = theDocumentOutlineView.numberOfItems(inSection: 0)
let theLastTextView = theDocumentOutlineView.item(at: numberOfItems - 1) as! DocumentItem
if textView == theLastTextView.itemView {
print(textView?.attributedString().size())
if (textView?.attributedString().size().height)! >= 1106.0 {
self.DocList.append(2)
var set = Set<IndexPath>()
set.insert(NSIndexPath(forItem: self.DocList.count - 1,inSection: 0) as IndexPath)
theDocumentOutlineView.insertItems(at: set)
theDocumentOutlineView.scrollToItems(at: set,scrollPosition: NSCollectionView.ScrollPosition.top)
var newFirstResponder = theDocumentOutlineView.item(at: self.DocList.count - 1) as! DocumentItem
newFirstResponder.itemView?.delegate = self
self.view.window?.makeFirstResponder(newFirstResponder.itemView)
}
}
}
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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