Objective c NSN概述查看示例

请给出一个简单完整的示例，说明使用NSOutlineView的Cocoa应用程序，其分层数据表示形式不像以前那样模棱两可

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谢谢

此示例使用一个简单的两层层次结构，由两个父Foo和Bar组成，它们分别有两个子Foox、Fooz和Barx、Barz，outline视图是默认视图，只有两列，第二列的标识符设置为“children”

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NSOutlineView使用NSURL和Swift填充目录结构的简单示例

AppDelegate.swift

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {


    var mainWindowController: MainWindowController?

    func applicationDidFinishLaunching(aNotification: NSNotification) {
        // Insert code here to initialize your application
        let mainWindowController = MainWindowController()
        mainWindowController.showWindow(self)
        self.mainWindowController = mainWindowController

    }

    func applicationWillTerminate(aNotification: NSNotification) {
        // Insert code here to tear down your application
    }

    func applicationShouldTerminateAfterLastWindowClosed(sender: NSApplication) -> Bool {
        return true
    }
}

FileItem.swift

class FileItem {
    var url: NSURL!
    var parent: FileItem?
    var isLeaf:Bool = false
    static let fileManager = NSFileManager.defaultManager()
    static let requiredAttributes = [NSURLIsDirectoryKey]
    static let options: NSDirectoryEnumerationOptions = [.SkipsHiddenFiles, .SkipsPackageDescendants, .SkipsSubdirectoryDescendants]


    lazy var children: [FileItem]? = {
        if let enumerator = fileManager.enumeratorAtURL(self.url, includingPropertiesForKeys:FileItem.requiredAttributes, options: FileItem.options, errorHandler: nil) {

            var files = [FileItem]() 

            while let localURL = enumerator.nextObject() as? NSURL {
                do {
                    let properties = try localURL.resourceValuesForKeys(FileItem.requiredAttributes)
                    // check this
                    files.append(FileItem(url: localURL, parent: self, isLeaf: (properties[NSURLIsDirectoryKey] as! NSNumber).boolValue))
                } catch {
                    print("Error reading file attributes")
                }
            }
            return files
        }
        return nil
    }()

    init(url: NSURL, parent: FileItem?, isLeaf: Bool){
        self.url = url
        self.parent = parent
        self.isLeaf = isLeaf
    }

    var displayName: String {
        get {
            return self.url.lastPathComponent!
        }
    }

    var count: Int {
        return (self.children?.count)!
    }

    func childAtIndex(n: Int) -> FileItem? {
        return self.children![n]
    }
}

我正在使用MainWindowController，其中xib已从应用程序委派中删除提供的窗口，IBOutlet用于窗口

import Cocoa

class MainWindowController: NSWindowController {

    @IBOutlet weak var outline: NSOutlineView!
    private var rootItem: FileItem? = FileItem(url: NSURL(fileURLWithPath:"/"), parent: nil, isLeaf: true)

    override func windowDidLoad() {
        super.windowDidLoad()

        // Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
    }

    override var windowNibName: String? {
        return "MainWindowController"
    }
}

//MARK: - NSOutlineViewDelegate
extension MainWindowController: NSOutlineViewDelegate {

    func outlineView(outlineView: NSOutlineView, viewForTableColumn tableColumn: NSTableColumn?, item: AnyObject) -> NSView? {
        let view = outline.makeViewWithIdentifier("TextCell", owner: self) as? NSTableCellView
        if let it = item as? FileItem {
            if let textField = view?.textField {
                textField.stringValue = it.displayName
            }
        } else {
            if let textField = view?.textField {
                textField.stringValue = self.rootItem!.displayName
            }
        }
        return view
    }
}

//MARK: - NSOutlineViewDataSource
extension MainWindowController: NSOutlineViewDataSource {

     func outlineView(outlineView: NSOutlineView, child index: Int, ofItem item: AnyObject?) -> AnyObject {
        if let it = item as? FileItem {
            return it.childAtIndex(index)!
        }
        return rootItem!
    }
    func outlineView(outlineView: NSOutlineView, numberOfChildrenOfItem item: AnyObject?) -> Int {
        if let it = item as? FileItem {
            return it.count
        }
        return 1
    }
    func outlineView(outlineView: NSOutlineView, isItemExpandable item: AnyObject) -> Bool {
        if let it = item as? FileItem {
            if it.count > 0 {
                return true
            }
        }
        return false
    }
}

这里的例子

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这是这个例子的一个修改版本

这是一个例子。有很多例子。然后删除链接Chris。我也很难找到一个很好的方法，但是问题从来没有提到Cocoa绑定

func-outlineView（outlineView:NSOutlineView，子索引：Int，of-item-item:AnyObject？->AnyObject

是

NSOutlineViewDataSource

中的一个方法，而不是

NSOutlineViewDelegate

import Cocoa

class MainWindowController: NSWindowController {

    @IBOutlet weak var outline: NSOutlineView!
    private var rootItem: FileItem? = FileItem(url: NSURL(fileURLWithPath:"/"), parent: nil, isLeaf: true)

    override func windowDidLoad() {
        super.windowDidLoad()

        // Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
    }

    override var windowNibName: String? {
        return "MainWindowController"
    }
}

//MARK: - NSOutlineViewDelegate
extension MainWindowController: NSOutlineViewDelegate {

    func outlineView(outlineView: NSOutlineView, viewForTableColumn tableColumn: NSTableColumn?, item: AnyObject) -> NSView? {
        let view = outline.makeViewWithIdentifier("TextCell", owner: self) as? NSTableCellView
        if let it = item as? FileItem {
            if let textField = view?.textField {
                textField.stringValue = it.displayName
            }
        } else {
            if let textField = view?.textField {
                textField.stringValue = self.rootItem!.displayName
            }
        }
        return view
    }
}

//MARK: - NSOutlineViewDataSource
extension MainWindowController: NSOutlineViewDataSource {

     func outlineView(outlineView: NSOutlineView, child index: Int, ofItem item: AnyObject?) -> AnyObject {
        if let it = item as? FileItem {
            return it.childAtIndex(index)!
        }
        return rootItem!
    }
    func outlineView(outlineView: NSOutlineView, numberOfChildrenOfItem item: AnyObject?) -> Int {
        if let it = item as? FileItem {
            return it.count
        }
        return 1
    }
    func outlineView(outlineView: NSOutlineView, isItemExpandable item: AnyObject) -> Bool {
        if let it = item as? FileItem {
            if it.count > 0 {
                return true
            }
        }
        return false
    }
}