0 
class InstanceViewController: NSViewController{
    @IBOutlet weak var InstanceAddr:NSTextField!
    var input: String = ""
    override func viewDidLoad(){
        super.viewDidLoad()
    }

    override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
        InstanceViewController().input = "https://google.com"
        if (segue.identifier?.rawValue == "moveToLoginWindow"){
            let destinationVC = segue.destinationController as! loginWebViewController
            destinationVC.address = input
        }
    }
}

class loginWebViewController: NSViewController{
    @IBOutlet weak var instanceview: WKWebView!
    var address: String?
    override func viewDidLoad(){
        var instanceaddress: String? = address
        super.viewDidLoad()
        var url = URL(string: instanceaddress!)
        var request = URLRequest(url: url!)
        instanceview.load(request)
    }
}

我正在尝试将变量input: String从 InstanceViewController 传递到address: String?loginWebViewController 并使用此地址加载 webview。我成功加载了 webview，但我似乎无法通过 segue 传递变量moveToLoginWindow。我做了我能想到的一切，但没有任何效果。谁能告诉我我做错了什么？

4

2 回答 2

0 
class InstanceViewController: NSViewController{
    @IBOutlet weak var InstanceAddr:NSTextField!
    var input: String = ""
    override func viewDidLoad(){
        super.viewDidLoad()
    }

    override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
        InstanceViewController().input = "https://google.com" // Well actually in this line you are creating a new instance for your controller , that will not affect the input value of this controller So correction will be :-
        self.input = "https://google.com"
        if (segue.identifier?.rawValue == "moveToLoginWindow"){
            let destinationVC = segue.destinationController as! loginWebViewController
            destinationVC.address = input
        }
    }
}

class loginWebViewController: NSViewController{
    @IBOutlet weak var instanceview: WKWebView!
    var address: String?
    override func viewDidLoad(){
        var instanceaddress: String? = address // there is no need of create extra object as both are optional Prefer  guard let instanceaddress = address else { return }
        super.viewDidLoad()
        var url = URL(string: instanceaddress!)
        var request = URLRequest(url: url!)
        instanceview.load(request)
    }
}

这可能会对您有所帮助：-

class InstanceViewController: NSViewController{
    @IBOutlet weak var InstanceAddr:NSTextField!
    var input: String = ""
    override func viewDidLoad(){
        super.viewDidLoad()
    }

    override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
        self.input = "https://google.com"
        if (segue.identifier?.rawValue == "moveToLoginWindow"){
            let destinationVC = segue.destinationController as! loginWebViewController
            destinationVC.address = input
        }
    }
}

class loginWebViewController: NSViewController{
    @IBOutlet weak var instanceview: WKWebView!
    var address: String?
    override func viewDidLoad(){
        super.viewDidLoad()
        guard let instanceAddress = address, let url = URL(string: instanceAddress) else { return}
        var request = URLRequest(url: url)
        instanceview.load(request)
    }
}
于 2018-08-01T06:52:34.053 回答
0

在同一类型的另一个实例中创建一个新实例InstanceViewController是没有意义的，并且会导致问题。

您必须使用input当前实例：

override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
    input = "https://google.com"
    if segue.identifier?.rawValue == "moveToLoginWindow" {
        let destinationVC = segue.destinationController as! loginWebViewController
        destinationVC.address = input
    }
}

并且由于传递的类型是非可选的，因此address也声明为非可选的

var address = ""
于 2018-08-01T06:52:53.977 回答