Question

我正在尝试将数据从我的popover传递回另一个启动它的类。我读到这样做的模式是使用委托，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)
    }
}

然后我有一个带有控制器的xib：

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评论的位置，并且是Cannot assign value of type 'MyMainClass' to type 'NSPopoverDelegate'。如果我的主要课程标题为class MyMainClass: NSPopoverDevelegate，它会抱怨我没有实现NSObjectProtocol我不想做的所有方法。

Answer 1

这一切都非常混乱。您在UserInfoPopupController上创建了一个delegate属性，但您正在为NSPopover分配一个委托。因此，您需要将代码更改为以下内容：

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)
        }
    }
}

无法设置NSPopover的委托字段

1 个答案: