WKWebview“ .html要使用您的当前位置”拦截不起作用
我对“ .html想要使用您的当前位置”消息有疑问。
因此，我在堆栈
但是我在userContentController(_:didReceive:)中什么也没收到
而且我还在.plist中设置了Privacy - Location When In Use Usage Description。
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
WKUserContentController *userContent = [[WKUserContentController alloc] init];
NSString *scriptString = @"navigator.geolocation.getCurrentPosition = function(success, error, options) { ... }; navigator.geolocation.watchPosition = function(success, error, options) { ... }; navigator.geolocation.clearWatch = function(id) { ... };";
WKUserScript *script = [[WKUserScript alloc] initWithSource: scriptString injectionTime: WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:YES];
[userContent addUserScript:script];
config.userContentController = userContent;
self.webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration: config];
- (void)userContentController:(WKUserContentController*)userContentController didReceiveScriptMessage:(WKScriptMessage*)message {
NSString *name = message.name;
NSLog(@"===) message name = %@",name);
}
js示例代码：
var onSuccess = function(position) {
alert('Latitude: ' + position.coords.latitude + '\n' +
'Longitude: ' + position.coords.longitude + '\n' +
'Altitude: ' + position.coords.altitude + '\n' +
'Accuracy: ' + position.coords.accuracy + '\n' +
'Altitude Accuracy: ' + position.coords.altitudeAccuracy + '\n' +
'Heading: ' + position.coords.heading + '\n' +
'Speed: ' + position.coords.speed + '\n' +
'Timestamp: ' + position.timestamp + '\n');
};
// onError Callback receives a PositionError object
//
function onError(error) {
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}
navigator.geolocation.getCurrentPosition(onSuccess, onError);
1 个答案:
答案 0 :(得分：0)
因为我没有找到解决方案来避免这个愚蠢的重复权限请求，所以我创建了快捷类NavigatorGeolocation。此类的目的是使用具有以下3种优点的自定义变量覆盖本机JavaScript的navigator.geolocation API：
- 前端/ JavaScript开发人员使用
navigator.geolocationAPI 标准方法，无需注意它会被覆盖并使用代码 调用JS->后面的Swift - 将所有逻辑尽可能保留在ViewController之外
- 不再有丑陋且愚蠢的重复权限请求（一个用于应用程序，另一个用于webview）：
我在https://stackoverflow.com/a/56921220/3826175处看到了类似的解决方案，但它缺少我的第一和第二个好处。在该解决方案中，前端开发人员必须向iOS添加JavaScript代码特定的代码。我不喜欢这种丑陋的平台添加-我的意思是从Swift调用的JavaScript函数getLocation从未被Web或android平台使用。我有一个混合应用程序（web / android / ios），它在ios / android上使用webview，我只想为所有平台使用一个相同的HTML5 + JavaScript代码，但我不想使用像Apache Cordova（以前称为PhoneGap）这样的大型解决方案。
您可以轻松地将NavigatorGeolocation类集成到您的项目中-只需创建新的swift文件NavigatorGeolocation.swift，从我的答案中复制内容，然后在ViewController.swift中添加与var navigatorGeolocation相关的4行。
我认为Google的Android比Apple的iOS聪明得多，因为Android的Webview不会因重复的权限请求而烦恼，因为用户已经为应用授予/拒绝了权限。有人会捍卫苹果，所以再也没有安全问题要问两次。
ViewController.swift ：
import UIKit
import WebKit
class ViewController: UIViewController, WKNavigationDelegate {
var webView: WKWebView!;
var navigatorGeolocation = NavigatorGeolocation();
override func loadView() {
super.loadView();
let webViewConfiguration = WKWebViewConfiguration();
navigatorGeolocation.setUserContentController(webViewConfiguration: webViewConfiguration);
webView = WKWebView(frame:.zero , configuration: webViewConfiguration);
webView.navigationDelegate = self;
navigatorGeolocation.setWebView(webView: webView);
view.addSubview(webView);
}
override func viewDidLoad() {
super.viewDidLoad();
let url = Bundle.main.url(forResource: "index", withExtension: "html", subdirectory: "webapp");
let request = URLRequest(url: url!);
webView.load(request);
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
webView.evaluateJavaScript(navigatorGeolocation.getJavaScripToEvaluate());
}
}
NavigatorGeolocation.swift ：
import WebKit
import CoreLocation
class NavigatorGeolocation: NSObject, WKScriptMessageHandler, CLLocationManagerDelegate {
var locationManager = CLLocationManager();
var listenersCount = 0;
var webView: WKWebView!;
override init() {
super.init();
locationManager.delegate = self;
}
func setUserContentController(webViewConfiguration: WKWebViewConfiguration) {
let controller = WKUserContentController();
controller.add(self, name: "listenerAdded");
controller.add(self, name: "listenerRemoved");
webViewConfiguration.userContentController = controller;
}
func setWebView(webView: WKWebView) {
self.webView = webView;
}
func locationServicesIsEnabled() -> Bool {
return (CLLocationManager.locationServicesEnabled()) ? true : false;
}
func authorizationStatusNeedRequest(status: CLAuthorizationStatus) -> Bool {
return (status == .notDetermined) ? true : false;
}
func authorizationStatusIsGranted(status: CLAuthorizationStatus) -> Bool {
return (status == .authorizedAlways || status == .authorizedWhenInUse) ? true : false;
}
func authorizationStatusIsDenied(status: CLAuthorizationStatus) -> Bool {
return (status == .restricted || status == .denied) ? true : false;
}
func onLocationServicesIsDisabled() {
webView.evaluateJavaScript("navigator.geolocation.helper.error(2, 'Location services disabled');");
}
func onAuthorizationStatusNeedRequest() {
locationManager.requestWhenInUseAuthorization();
}
func onAuthorizationStatusIsGranted() {
locationManager.startUpdatingLocation();
}
func onAuthorizationStatusIsDenied() {
webView.evaluateJavaScript("navigator.geolocation.helper.error(1, 'App does not have location permission');");
}
func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
if (message.name == "listenerAdded") {
listenersCount += 1;
if (!locationServicesIsEnabled()) {
onLocationServicesIsDisabled();
}
else if (authorizationStatusIsDenied(status: CLLocationManager.authorizationStatus())) {
onAuthorizationStatusIsDenied();
}
else if (authorizationStatusNeedRequest(status: CLLocationManager.authorizationStatus())) {
onAuthorizationStatusNeedRequest();
}
else if (authorizationStatusIsGranted(status: CLLocationManager.authorizationStatus())) {
onAuthorizationStatusIsGranted();
}
}
else if (message.name == "listenerRemoved") {
listenersCount -= 1;
// no listener left in web view to wait for position
if (listenersCount == 0) {
locationManager.stopUpdatingLocation();
}
}
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
// didChangeAuthorization is also called at app startup, so this condition checks listeners
// count before doing anything otherwise app will start location service without reason
if (listenersCount > 0) {
if (authorizationStatusIsDenied(status: status)) {
onAuthorizationStatusIsDenied();
}
else if (authorizationStatusIsGranted(status: status)) {
onAuthorizationStatusIsGranted();
}
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.last {
webView.evaluateJavaScript("navigator.geolocation.helper.success('\(location.timestamp)', \(location.coordinate.latitude), \(location.coordinate.longitude), \(location.altitude), \(location.horizontalAccuracy), \(location.verticalAccuracy), \(location.course), \(location.speed));");
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
webView.evaluateJavaScript("navigator.geolocation.helper.error(2, 'Failed to get position (\(error.localizedDescription))');");
}
func getJavaScripToEvaluate() -> String {
let javaScripToEvaluate = """
// management for success and error listeners and its calling
navigator.geolocation.helper = {
listeners: {},
noop: function() {},
id: function() {
var min = 1, max = 1000;
return Math.floor(Math.random() * (max - min + 1)) + min;
},
clear: function(isError) {
for (var id in this.listeners) {
if (isError || this.listeners[id].onetime) {
navigator.geolocation.clearWatch(id);
}
}
},
success: function(timestamp, latitude, longitude, altitude, accuracy, altitudeAccuracy, heading, speed) {
var position = {
timestamp: new Date(timestamp).getTime() || new Date().getTime(), // safari can not parse date format returned by swift e.g. 2019-12-27 15:46:59 +0000 (fallback used because we trust that safari will learn it in future because chrome knows that format)
coords: {
latitude: latitude,
longitude: longitude,
altitude: altitude,
accuracy: accuracy,
altitudeAccuracy: altitudeAccuracy,
heading: (heading > 0) ? heading : null,
speed: (speed > 0) ? speed : null
}
};
for (var id in this.listeners) {
this.listeners[id].success(position);
}
this.clear(false);
},
error: function(code, message) {
var error = {
PERMISSION_DENIED: 1,
POSITION_UNAVAILABLE: 2,
TIMEOUT: 3,
code: code,
message: message
};
for (var id in this.listeners) {
this.listeners[id].error(error);
}
this.clear(true);
}
};
// @override getCurrentPosition()
navigator.geolocation.getCurrentPosition = function(success, error, options) {
var id = this.helper.id();
this.helper.listeners[id] = { onetime: true, success: success || this.noop, error: error || this.noop };
window.webkit.messageHandlers.listenerAdded.postMessage("");
};
// @override watchPosition()
navigator.geolocation.watchPosition = function(success, error, options) {
var id = this.helper.id();
this.helper.listeners[id] = { onetime: false, success: success || this.noop, error: error || this.noop };
window.webkit.messageHandlers.listenerAdded.postMessage("");
return id;
};
// @override clearWatch()
navigator.geolocation.clearWatch = function(id) {
var idExists = (this.helper.listeners[id]) ? true : false;
if (idExists) {
this.helper.listeners[id] = null;
delete this.helper.listeners[id];
window.webkit.messageHandlers.listenerRemoved.postMessage("");
}
};
""";
return javaScripToEvaluate;
}
}
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