ios - 参数标签 '(URL:)' 与任何可用的重载都不匹配

Question

我正在尝试将代码转换为 Swift 3，但收到此错误:

Argument labels '(URL:)' do not match any available overloads

let viewController = VisitableViewController(URL: URL)

这是我的完整代码:

var window: UIWindow?
var navigationController = UINavigationController()
var session = Session()


func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    window?.rootViewController = navigationController
    visit(URL: NSURL(string: "http://localhost:9292/")!)
    return true
}

func visit(URL: NSURL) {
    let viewController = VisitableViewController(URL: URL)
    navigationController.pushViewController(viewController, animated: true)
    session.visit(viewController)
}

这是 VisitableViewController :

import UIKit

open class VisitableViewController: UIViewController, Visitable {
    open weak var visitableDelegate: VisitableDelegate?

    open var visitableURL: URL!

    public convenience init(url: URL) {
        self.init()
        self.visitableURL = url
    }

    // MARK: Visitable View

    open private(set) lazy var visitableView: VisitableView! = {
        let view = VisitableView(frame: CGRect.zero)
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()

    fileprivate func installVisitableView() {
        view.addSubview(visitableView)
        view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[view]|", options: [], metrics: nil, views: [ "view": visitableView ]))
        view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[view]|", options: [], metrics: nil, views: [ "view": visitableView ]))
    }

    // MARK: Visitable

    open func visitableDidRender() {
        self.title = visitableView.webView?.title
    }

    // MARK: View Lifecycle

    open override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor.white
        installVisitableView()
    }

    open override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        visitableDelegate?.visitableViewWillAppear(self)
    }

    open override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        visitableDelegate?.visitableViewDidAppear(self)
    }

    /*
     If the visitableView is a child of the main view, and anchored to its top and bottom, then it's
     unlikely you will need to customize the layout. But more complicated view hierarchies and layout 
     may require explicit control over the contentInset. Below is an example of setting the contentInset 
     to the layout guides.

    public override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        visitableView.contentInset = UIEdgeInsets(top: topLayoutGuide.length, left: 0, bottom: bottomLayoutGuide.length, right: 0)
    }
    */
}

Answer 1

我建议:

func visit(url: URL) {
    let viewController = VisitableViewController(url: url)
    navigationController.pushViewController(viewController, animated: true)
    session.visit(viewController)
}

对于 VisitableViewController 初始值设定项，使用 url: 而不是 URL:。我还建议使用 visit 遵循相同的约定，并将 NSURL 替换为 URL。