Question

早上好，

我有这堂课：

import Cocoa

class PopOverDetails: NSViewController {

    var dID = String()

    @IBOutlet weak var txtEmail: NSTextField!

    public func fillDetails (ID:NSManagedObjectID) {

        print("=== fillDetails ===")
        print(ID)
        dID = "\(ID)"

    }


    override func viewDidLoad() {
        print("=== viewDidLoad ===")
        print(dID)
    }

}

我从另一个视图控制器调用该函数

let Controller = PopOverDetails()
Controller.fillDetails(ID: list[0].objectID)

al工作正常，但问题是：在我的函数fillDetails中，我得到了我从视图控制器“发送”的objectID值。

但我无法在viedidload中使用此值，因为它是空的。这是我的输出：

=== fillDetails ===
0x40000b <x-coredata://7E006435-3E05-41F9-A3E4-CB8179A319A9/list/p1>
=== viewDidLoad ===

我的错误在哪里？：）

更新

let vcDetails = NSStoryboard(name: "Main", bundle: nil).instantiateController(withIdentifier: "PopoverDetails") as! NSViewController
popover.contentViewController = vcDetails
popover.show(relativeTo: tblView.rect(ofRow: tblView.selectedRow) ,  of: tblView, preferredEdge: .maxX)
    }

Answer 1

首先在PopOverDetails中声明变量，即＆＃34; id＆＃34;，然后

let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let secondViewController = storyBoard.instantiateViewController(withIdentifier: "your_identifier") as! PopOverDetails
secondViewController.id = list[0].objectID
self.navigationController?.pushViewController(secondViewController, animated: true)

现在你可以在PopViewController的类中获取该变量

调用外部函数但没有值

1 个答案: