swift – 将NSTreeController与NSOutlineView一起使用

我正在尝试(不成功)构建一个TreeController控制的NSOutlineView.我已经阅读了很多教程,但他们都在开始之前预先加载了数据,这对我来说不起作用.

我有一个简单的设备类：

import Cocoa
class Device: NSObject {
    let name : String
    var children = [Service]()
    var serviceNo = 1
    var count = 0

    init(name: String){
        self.name = name
    }

    func addService(serviceName: String){
        let serv = "(serviceName) # (serviceNo)"
        children.append(Service(name: serv))
        serviceNo += 1
        count = children.count
    }

    func isLeaf() -> Bool {
        return children.count < 1
    }
}

我还有一个更简单的“服务”课程：

import Cocoa
class Service: NSObject {

    let name: String

    init(name: String){
        self.name = name
    }
}

最后,我有ViewController：

class ViewController: NSViewController {

    var stepper = 0

    dynamic var devices = [Device]()
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override var representedObject: Any? {
        didSet {
        // Update the view,if already loaded.
        }
    }

    @IBAction func addDeviceAction(_ sender: Any) {
        let str = "New Device #(stepper)"
        devices.append(Device(name: str))
        stepper += 1
        print("Added Device: (devices[devices.count-1].name)")    
    }

    @IBAction func addService(_ sender: Any) {
        for i in 0..<devices.count {
            devices[i].addService(serviceName: "New Service")
       }
    }
}

显然我有2个按钮,一个添加“设备”,另一个为每个设备添加“服务”.

我无法实现的是NSOutlineView中显示的任何数据.我已经将TreeController的对象控制器属性设置为Mode：Class和Class：Device,并且没有设置我得到的Children,Count或Leaf属性(可预测)：

2017-01-04 17:20:19.337129 OutlineTest[12550:1536405] Warning: [object class: Device] childrenKeyPath cannot be nil. To eliminate this log message,set the childrenKeyPath attribute in Interface Builder

如果我然后将Children属性设置为’children’则会非常糟糕：

2017-01-04 17:23:11.150627 OutlineTest[12695:1548039] [General] [ addObserver:forKeyPath:options:context:] is not supported. Key path: children

我要做的就是设置NSOutlineView来从NSTreeController获取输入,这样当一个新的’Device’被添加到devices []数组时,它会显示在Outline视图中.

如果有人能指出我正确的方向,我将非常感激.

非常感谢沃伦的非常有益的工作.我(大部分)都在工作.除了沃伦的建议之外,我还需要做一些事情：

设置树控制器的数据存储

将OutlineView绑定到TreeController

将列绑定到TreeController

将TableView单元格绑定到表格单元格视图(是的,真的)

完成所有这些后,我不得不稍微使用实际的数据存储区：

var name = "Bluetooth Devices Root"
var deviceStore = [Device]()
@IBOutlet var treeController: NSTreeController!
@IBOutlet weak var outlineView: NSOutlineView!


override func viewDidLoad() {
    super.viewDidLoad()
    deviceStore.append(Device(name: "Bluetooth Devices"))
    self.treeController.content = self
}

override var representedObject: Any? {
    didSet {
    // Update the view,if already loaded.
    }
}

@IBAction func addDeviceAction(_ sender: Any) {
    if(deviceStore[0].name == "Bluetooth Devices"){
        deviceStore.remove(at: 0)
    }

事实证明,Root在开始时不能没有孩子,至少就我所知.一旦我添加了一个孩子,我就可以删除占位符值,并且树似乎可以正常工作(大部分).另一件事是我必须重新加载数据并在数据发生变化时重新显示大纲：

outlineView.reloadData()
 outlineView.setNeedsDisplay()

没有它,没有.我仍然没有正确更新数据(请参阅Warren的回答下面的评论),但我差不多了.

@objc protocol TreeNode:class { 
    var isLeaf:Bool { get }
    var childCount:Int { get }
    var children:[TreeNode] { get } 
}

class Service: NSObject,TreeNode {

    let name: String
    init(name: String){
        self.name = name
    }

    var isLeaf:Bool {
        return true
    }
    var childCount:Int {
        return 0
    }
    var children:[TreeNode] {
        return []
    }
}

class Device: NSObject,TreeNode {
    let name : String
    var serviceStore = [Service]()

    init(name: String){
        self.name = name
    }

    var isLeaf:Bool {
        return serviceStore.isEmpty
    }
    var childCount:Int {
        return serviceStore.count
    }
    var children:[TreeNode] {
        return serviceStore
    }

}

class ViewController: NSViewController,TreeNode {

    var deviceStore = [Device]()
    var name = "Henry" //whatever you want to name your root

    var isLeaf:Bool {
        return deviceStore.isEmpty
    }
    var childCount:Int {
        return deviceStore.count
    }
    var children:[TreeNode] {
        return deviceStore
    }

}

class ViewController: NSViewController,TreeNode {

    @IBOutlet var treeController:NSTreeController!
    @IBOutlet var outlineView:NSOutlineView!


    override func viewDidLoad() {
        super.viewDidLoad()
        treeController.content = self
    }

@IBAction func addDeviceAction(_ sender: Any) {
        let str = "New Device #(stepper)"
        devices.append(Device(name: str))
        stepper += 1
        print("Added Device: (devices[devices.count-1].name)")
        outlineView.reloadItem(self,reloadChildren: true)    
    }