如何将数据从swift发送到javascript并在我的Web视图中显示？

我正在使用 swift 2和 HTML / Javascript进行iOS混合应用程序.我有一个本机shell,从日历和GPS获取一些信息.我想在我的WKWebView中显示这些信息,并每隔一秒更新一次.我正在使用本地html.

我找到了一些示例,说明如何在本机代码和JS之间进行通信,但没有关于如何传输我的“本机”数据并在Web视图中显示它们.
谢谢.

您应该要求位置管理员为您更新位置,而不是设置1秒钟的NSTimer来自行完成.要将数据传递给Javascript,您可以使用WKWebView的evaluate JavaScript 方法：

import UIKit
import WebKit
import CoreLocation

class ViewController: UIViewController,CLLocationManagerDelegate {
    weak var webView: WKWebView!
    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()

        createWebView()
        locationManager.delegate = self
        locationManager.startUpdatingLocation()
        locationManager.requestWhenInUseAuthorization()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func createWebView() {
        let url = NSBundle.mainBundle().URLForResource("my_page",withExtension: "html")!

        let webView = WKWebView()
        webView.loadFileURL(url,allowingReadAccessToURL: url)
        webView.translatesAutoresizingMaskIntoConstraints = false

        self.view.addSubview(webView)

        // Auto Layout
        let views = ["webView": webView]
        let c1 = NSLayoutConstraint.constraintsWithVisualFormat("H:|[webView]|",options: [],metrics: nil,views: views)
        let c2 = NSLayoutConstraint.constraintsWithVisualFormat("V:[webView]|",views: views)
        let c3 = NSLayoutConstraint(item: webView,attribute: .Top,relatedBy: .Equal,toItem: self.topLayoutGuide,attribute: .Bottom,multiplier: 1,constant: 0)
        NSLayoutConstraint.activateConstraints(c1 + c2 + [c3])

        // Pass the reference to the View's Controller
        self.webView = webView
    }

    func locationManager(manager: CLLocationManager,didUpdateLocations locations: [CLLocation]) {
        let lastLocation = locations.last!

        let dict = [
            "lat": lastLocation.coordinate.latitude,"long": lastLocation.coordinate.longitude
        ]
        let jsonData = try! NSJSONSerialization.dataWithJSONObject(dict,options: [])
        let jsonString = String(data: jsonData,encoding: NSUTF8StringEncoding)!

        // Send the location update to the page
        self.webView.evaluateJavaScript("updateLocation(\(jsonString))") { result,error in
            guard error == nil else {
                print(error)
                return
            }
        }
    }
}

和my_page.html：

<!DOCTYPE html>
<html>
<head>
    <Meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <Meta name="viewport" content="width=device-width; initial-scale=1.0">
    <title>This is a test page</title>
    <script type="text/javascript">
    function updateLocation(data)
    {
        var ele = document.getElementById('location');
        ele.innerHTML = 'Last location: lat = ' + data['lat'] + ',long = ' + data['long'];
    }
    </script>
</head>
<body>
    <p id="location">Last location:</p>
</body>
</html>

如果您在模拟器中测试它,请选择Debug>位置> City Run可以看到它不断更新(就像你在公园里跑步一样).

原文链接：https://www.f2er.com/swift/318696.html

如何将数据从swift发送到javascript并在我的Web视图中显示？

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