swift - NSTableCellView View 中的 NSPopupButton 导致泄漏

Question

环境

• Xcode:9.4.1
• swift :4
• 目标平台:10.11

问题

我有这些简单得可笑的 NSViewController 和 NSTableViewCell 子类，它们结合起来会给我带来非常奇怪的内存泄漏(如 Debug Memory Graph 和 Memory Leak Instrument 所报告)当我在 SensorListCellView 中包含一个库存 NSPopupButton 时。

代码 stub

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

如 Debug Memory Graph 中所示，我有四处泄漏. 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的说法。无论我对 NSPopupButton 做什么，我都会根据上面的描述得到四个漏洞。

如有任何帮助、建议或指导，我们将不胜感激。

Answer 1

对于 Xcode 9.4.1、Swift 4，除了“是 AppKit”本身在泄漏，我找不到其他答案。从 Xcode 10.0 - Beta 2 开始，不再观察到上述行为。我认为问题已解决。