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).
