NSSegmentedControl action not firing

Question

I am not using any Storyboards/NIBs, I'm creating all my UI programmatically.

Here's the main window controller:

class MainWindowController: NSWindowController, NSToolbarDelegate {

    var toolbar: NSToolbar!
    var segmentedControl: NSSegmentedControl!

    override func loadWindow() {
        self.window = NSWindow(contentRect: .init(origin: .zero, size: .init(width: 640, height: 480)),
                               styleMask: NSWindow.StyleMask(rawValue: (NSWindow.StyleMask.closable.rawValue | NSWindow.StyleMask.titled.rawValue | NSWindow.StyleMask.miniaturizable.rawValue | NSWindow.StyleMask.resizable.rawValue)),
                               backing: .buffered, defer: true)
    }

    override init(window: NSWindow?) {
        super.init(window: window)
        loadWindow()

        self.window?.center()

        self.segmentedControl = NSSegmentedControl(labels: ["1", "2", "3"], trackingMode: NSSegmentedControl.SwitchTracking.selectOne, target: self, action: #selector(switchTabs))
        self.segmentedControl.setSelected(true, forSegment: 0)

        self.toolbar = NSToolbar(identifier: .init("MainToolbar"))
        self.toolbar.delegate = self
        self.toolbar.displayMode = .iconOnly
        self.window?.toolbar = self.toolbar

        self.window?.contentViewController = MainSplitViewController()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: - Selectors

    @objc func switchTabs(sender: Any) {
        let segmentedControl = sender as! NSSegmentedControl
        let tabVC = (self.window!.contentViewController as! MainSplitViewController!).tabViewController
        tabVC.tabView.selectTabViewItem(at: segmentedControl.selectedSegment)
    }

    // MARK: - NSToolbarDelegate

    func toolbarDefaultItemIdentifiers(_ toolbar: NSToolbar) -> [NSToolbarItem.Identifier] {
        return [
            NSToolbarItem.Identifier.init("Add"),
            NSToolbarItem.Identifier.flexibleSpace,
            NSToolbarItem.Identifier.init("NSSegmentedControl"),
            NSToolbarItem.Identifier.flexibleSpace,
            NSToolbarItem.Identifier.init("Search")
        ]
    }

    func toolbarAllowedItemIdentifiers(_ toolbar: NSToolbar) -> [NSToolbarItem.Identifier] {
        return [
            NSToolbarItem.Identifier.flexibleSpace,
            NSToolbarItem.Identifier.init("NSSegmentedControl"),
            NSToolbarItem.Identifier.init("Search"),
            NSToolbarItem.Identifier.init("Add")
        ]
    }

    func toolbar(_ toolbar: NSToolbar, itemForItemIdentifier itemIdentifier: NSToolbarItem.Identifier, willBeInsertedIntoToolbar flag: Bool) -> NSToolbarItem? {
        switch itemIdentifier {
        case NSToolbarItem.Identifier.flexibleSpace:
            return NSToolbarItem(itemIdentifier: itemIdentifier)
        case NSToolbarItem.Identifier.init("NSSegmentedControl"):
            let toolbarItem = NSToolbarItem(itemIdentifier: itemIdentifier)
            toolbarItem.view = self.segmentedControl
            return toolbarItem
        case NSToolbarItem.Identifier.init("Search"):
            let toolbarItem = NSToolbarItem(itemIdentifier: itemIdentifier)
            let searchField = NSSearchField(frame: NSRect(origin: .zero, size: CGSize(width: 64, height: 64 )))
            toolbarItem.view = searchField
            return toolbarItem
        case NSToolbarItem.Identifier.init("Add"):
            let toolbarItem = NSToolbarItem(itemIdentifier: itemIdentifier)
            let addButton = NSButton(title: "Add", target: self, action: nil)
            toolbarItem.view = addButton
            return toolbarItem
        default:
            return nil
        }
    }

}

I have three NSViewControllers embedded in an NSTabViewController in my window. I want to be able to connect them to the selection of the NSSegmentedControl in my NSToolbar .

However, the action is never being fired. The switchTabs method is never being called. If I call the function directly, then it works! But nothing happens when I select a NSSegmentedCell .

What's going wrong here?

Am I doing the instantiation of the window correctly? Is my usage of loadWindow correct?

Answer 1

I've replaced your MainSplitViewController with a simply NSViewController subclass with its own nib (because there's only so much 'creating the interface in code' I'm willing to do), and it runs just fine - the toolbar gets created, the segments fire their action, selectedSegment reports the correct tag.

This makes your contentViewController and its associated view the most likely culprit: your toolbar code works just fine.

Answer 2

我无法在当前设置下正常运行，因此将target和action设置为NSTabViewController和该类中的selector 。