swift - 无法设置 NSPopover 的委托(delegate)字段

Question

我正在尝试将数据从我的弹出窗口传回给启动它的另一个类。我读到执行此操作的模式是使用委托(delegate)，所以我这样做了:

/*MyMainClass.swift*/
class MyMainClass: UserInfoPopoverDelegate {
    var popover: NSPopover = NSPopover()

    func showAskForUserInfoPopup() {
        if let button = statusItem.button {
            if !popover.isShown {
                popover.delegate = self //error here
                popover.contentViewController = UserInfoPopupController(nibName: "UserInfoPopup", bundle: nil)
                popover.show(relativeTo: button.bounds, of: button, preferredEdge: NSRectEdge.minY)
            }
        }
    }

    func submitAndClose(str: String){
        print(str)
        popover.performClose(nil)
    }
}

然后我有一个 xib 及其 Controller :

class UserInfoPopupController: NSViewController  {

    @IBOutlet weak var phoneField: NSTextField!
    @IBOutlet weak var emailField: NSTextField!
    weak var delegate: UserInfoPopoverDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()

     }

    @IBAction func close(_ sender: Any) {
       delegate?.submitAndClose(str: "close pressed")
    }

    @IBAction func submitDetails(_ sender: Any) {
        delegate?.submitAndClose(str: "submit pressed")
    } 
}

protocol UserInfoPopoverDelegate: class {
    func submitAndClose(str: String)
}

问题发生在我在代码中留下注释的地方，无法将类型“MyMainClass”的值分配给类型“NSPopoverDelegate”。如果我的主类的标题是 class MyMainClass: NSPopoverDevelegate，它会提示我没有实现 NSObjectProtocol 的所有方法，我真的不想这样做。

Answer 1

这一切都很困惑。您在 UserInfoPopupController 上创建了一个 delegate 属性，但您正在将一个委托(delegate)分配给 NSPopover。因此，您需要将代码更改为如下内容:

func showAskForUserInfoPopup() {
    if let button = statusItem.button {
        if !popover.isShown {
            let contentViewController = UserInfoPopupController(nibName: "UserInfoPopup", bundle: nil)
            contentViewController.delegate = self //This is where you should be assigning the delegate
            popover.contentViewController = contentViewController
            popover.show(relativeTo: button.bounds, of: button, preferredEdge: NSRectEdge.minY)
        }
    }
}