【发布时间】：2021-04-03 06:37:29
【问题描述】：
我有一个 NSOutlineView，项目 1 和 2 之间的间距大于所有其他项目之间的间距。这些是组项目。大纲视图非常简单。下面是我的代码，下面是我所指问题的图片：
var sections: [SidebarSection] = [
SidebarSection(title: "Section 1", items: ["1", "2", "3", "4", "5"]),
SidebarSection(title: "Section 2", items: ["1", "2"]),
SidebarSection(title: "Section 3", items: ["1", "2"]),
SidebarSection(title: "Section 4", items: ["1", "2"]),
SidebarSection(title: "Section 5", items: ["1", "2"])]
private let outlineView: SidebarOutlineView = SidebarOutlineView()
extension SidebarViewController: NSOutlineViewDataSource {
func outlineView(_ outlineView: NSOutlineView, isItemExpandable item: Any) -> Bool {
return item is SidebarSection
}
func outlineView(_ outlineView: NSOutlineView, child index: Int, ofItem item: Any?) -> Any {
if let section = item as? SidebarSection {
return section.items[index]
}
return sections[index]
}
func outlineView(_ outlineView: NSOutlineView, numberOfChildrenOfItem item: Any?) -> Int {
if let section = item as? SidebarSection {
return section.items.count
}
return sections.count
}
}
extension SidebarViewController: NSOutlineViewDelegate {
func outlineView(_ outlineView: NSOutlineView, heightOfRowByItem item: Any) -> CGFloat {
return 30
}
func outlineView(_ outlineView: NSOutlineView, isGroupItem item: Any) -> Bool {
return item is SidebarSection
}
func outlineView(_ outlineView: NSOutlineView, viewFor tableColumn: NSTableColumn?, item: Any) -> NSView? {
let view = outlineView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "SidebarPlaylistCell"), owner: self) as! SidebarPlaylistCell
view.wantsLayer = true
view.textLabel.stringValue = (item as? SidebarSection)?.title ?? ""
view.imgView.wantsLayer = true
view.imgView.layer?.backgroundColor = NSColor.red.cgColor
return view
}
}
extension SidebarViewController {
func layout() {
scrollView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(scrollView)
scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
scrollView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
scrollView.documentView = outlineView
outlineView.headerView = nil
outlineView.delegate = self
outlineView.dataSource = self
outlineView.intercellSpacing = NSSize(width: 0, height: 0)
scrollView.hasVerticalScroller = true
scrollView.hasHorizontalScroller = false
scrollView.wantsLayer = true
view.layer?.backgroundColor = NSColor.blue.cgColor
}
}
final class SidebarOutlineView: NSOutlineView {
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
let column: NSTableColumn = NSTableColumn(identifier: NSUserInterfaceItemIdentifier("col1"))
column.isEditable = false
column.minWidth = 0
addTableColumn(column)
outlineTableColumn = column
register(NSNib(nibNamed: "SidebarPlaylistCell", bundle: nil), forIdentifier: NSUserInterfaceItemIdentifier(rawValue: "SidebarPlaylistCell"))
selectionHighlightStyle = .sourceList
indentationPerLevel = 6.0
}
required init?(coder: NSCoder) {
super.init(coder: coder)
}
}
【问题讨论】：
-
SidebarPlaylistCell视图中的约束是什么？行视图的运行时高度是多少？