NSTopupButton在NSTableCellView视图中导致泄漏

Question

环境

• Xcode：9.4.1
• 斯威夫特：4
• 目标平台：10.11

问题

我有这些非常简单的NSViewController和NSTableViewCell子类，当它们组合在一起时会给我带来非常特殊的内存泄漏（由调试内存图和内存泄漏仪器报告）当我在SensorListCellView中包含股票NSPopupButton时。

代码存根

class ViewController: NSViewController {

    @IBOutlet weak var tableSensors: NSTableView!
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

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

extension ViewController: NSTableViewDataSource, NSTableViewDelegate {
    func numberOfRows(in tableView: NSTableView) -> Int {
        return 1
    }

    func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
        let result:SensorListCellView = tableView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "defaultRow"), owner: self) as! SensorListCellView

        // Just fill with any data
        result.imageSensorAvailable.image       = NSImage(named: NSImage.Name("NSStatusAvailable"))
        result.imageSensorAvailable.toolTip     = "Sensor is Available & Reporting"
        result.sensorID.stringValue             = "Sensor ID"
        result.sensorDescription.stringValue    = "Sensor Description"
        result.sensorName.stringValue           = "Sensor Name"

        // Just fill with any data
        result.unitsAvailable.addItem(withTitle: "One")
        result.unitsAvailable.addItem(withTitle: "Two")
        result.unitsAvailable.addItem(withTitle: "Three")

        return result
    }
}

class SensorListCellView: NSTableCellView {
    @IBOutlet weak var unitLabel: NSTextField!
    @IBOutlet weak var imageSensorAvailable: NSImageView!
    @IBOutlet weak var sensorID: NSTextField!
    @IBOutlet weak var sensorDescription: NSTextField!
    @IBOutlet weak var sensorName: NSTextField!
    @IBOutlet weak var unitsAvailable: NSPopUpButton!
}

发生了什么

我在Debug Memory Graph中看到了四次泄密。 Here is my very simple storyboard。 所有泄露的CFDictionary对象的描述是：

Printing description of $0:
{
    kCUIMeasureEdgeInsetBottomLeft = "NSSize: {9, 3}";
    kCUIMeasureEdgeInsetTopRight = "NSSize: {8, 6}";
    "measure.height" = 20;
    "measure.width" = 24;
}

如果我删除NSPopupButton，内存泄漏就会消失。说我不知所措是轻描淡写。无论我对NSPopupButton做什么，我都会从上面的描述中得到四个泄漏。

非常感谢任何帮助，建议或指示。

Answer 1

对于Xcode 9.4.1，Swift 4，除了“是AppKit”本身泄漏外，我找不到其他答案。从Xcode 10.0-Beta 2开始，不再注意到上述行为。我认为此事已解决。