似乎使用WebView打开谷歌地图（即https://maps.google.com）会导致致命错误。函数'onNavigationStateChange'将被称为无限次。我打印navState参数到日志，以下是输出： Log Output
这是我的代码，它是从WebView示例中修改的。
'use strict';
var React = require('react');
var ReactNative = require('react-native');
var {
AppRegistry,
StyleSheet,
Text,
TextInput,
TouchableWithoutFeedback,
TouchableOpacity,
View,
WebView
} = ReactNative;
var HEADER = '#3b5998';
var BGWASH = 'rgba(255,255,255,0.8)';
var DISABLED_WASH = 'rgba(255,255,255,0.25)';
var TEXT_INPUT_REF = 'urlInput';
var WEBVIEW_REF = 'webview';
var DEFAULT_URL = 'https://maps.google.com';
var WebViewExample = React.createClass({
getInitialState: function() {
return {
url: DEFAULT_URL,
status: 'No Page Loaded',
backButtonEnabled: false,
forwardButtonEnabled: false,
loading: true,
scalesPageToFit: true,
};
},
inputText: '',
handleTextInputChange: function(event) {
var url = event.nativeEvent.text;
if (!/^[a-zA-Z-_]+:/.test(url)) {
url = 'http://' + url;
}
this.inputText = url;
},
render: function() {
this.inputText = this.state.url;
return (
<View style={[styles.container]}>
<View style={[styles.addressBarRow]}>
<TouchableOpacity
onPress={this.goBack}
style={this.state.backButtonEnabled ? styles.navButton : styles.disabledButton}>
<Text>
{'<'}
</Text>
</TouchableOpacity>
<TouchableOpacity
onPress={this.goForward}
style={this.state.forwardButtonEnabled ? styles.navButton : styles.disabledButton}>
<Text>
{'>'}
</Text>
</TouchableOpacity>
<TextInput
ref={TEXT_INPUT_REF}
autoCapitalize="none"
defaultValue={this.state.url}
onSubmitEditing={this.onSubmitEditing}
onChange={this.handleTextInputChange}
clearButtonMode="while-editing"
style={styles.addressBarTextInput}
/>
<TouchableOpacity onPress={this.pressGoButton}>
<View style={styles.goButton}>
<Text>
Go!
</Text>
</View>
</TouchableOpacity>
</View>
<WebView
ref={WEBVIEW_REF}
automaticallyAdjustContentInsets={false}
style={styles.webView}
source={{uri: this.state.url}}
javaScriptEnabled={true}
domStorageEnabled={true}
decelerationRate="normal"
onNavigationStateChange={this.onNavigationStateChange}
onShouldStartLoadWithRequest={this.onShouldStartLoadWithRequest}
startInLoadingState={true}
scalesPageToFit={this.state.scalesPageToFit}
/>
<View style={styles.statusBar}>
<Text style={styles.statusBarText}>{this.state.status}</Text>
</View>
</View>
);
},
goBack: function() {
this.refs[WEBVIEW_REF].goBack();
},
goForward: function() {
this.refs[WEBVIEW_REF].goForward();
},
reload: function() {
this.refs[WEBVIEW_REF].reload();
},
onShouldStartLoadWithRequest: function(event) {
// Implement any custom loading logic here, don't forget to return!
return true;
},
onNavigationStateChange: function(navState) {
console.log(navState);
this.setState({
backButtonEnabled: navState.canGoBack,
forwardButtonEnabled: navState.canGoForward,
url: navState.url,
status: navState.title,
loading: navState.loading,
scalesPageToFit: true
});
},
onSubmitEditing: function(event) {
this.pressGoButton();
},
pressGoButton: function() {
var url = this.inputText.toLowerCase();
if (url === this.state.url) {
this.reload();
} else {
this.setState({
url: url,
});
}
// dismiss keyboard
this.refs[TEXT_INPUT_REF].blur();
},
});
var Button = React.createClass({
_handlePress: function() {
if (this.props.enabled !== false && this.props.onPress) {
this.props.onPress();
}
},
render: function() {
return (
<TouchableWithoutFeedback onPress={this._handlePress}>
<View style={[styles.button, this.props.enabled ? {} : styles.buttonDisabled]}>
<Text style={styles.buttonText}>{this.props.text}</Text>
</View>
</TouchableWithoutFeedback>
);
}
});
var ScaledWebView = React.createClass({
getInitialState: function() {
return {
scalingEnabled: true,
}
},
render: function() {
return (
<View>
<WebView
style={{
backgroundColor: BGWASH,
height: 200,
}}
source={{uri: 'https://facebook.github.io/react/'}}
scalesPageToFit={this.state.scalingEnabled}
/>
<View style={styles.buttons}>
{ this.state.scalingEnabled ?
<Button
text="Scaling:ON"
enabled={true}
onPress={() => this.setState({scalingEnabled: false})}
/> :
<Button
text="Scaling:OFF"
enabled={true}
onPress={() => this.setState({scalingEnabled: true})}
/> }
</View>
</View>
);
},
})
var styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: HEADER,
},
addressBarRow: {
flexDirection: 'row',
padding: 8,
},
webView: {
backgroundColor: BGWASH,
height: 350,
},
addressBarTextInput: {
backgroundColor: BGWASH,
borderColor: 'transparent',
borderRadius: 3,
borderWidth: 1,
height: 24,
paddingLeft: 10,
paddingTop: 3,
paddingBottom: 3,
flex: 1,
fontSize: 14,
},
navButton: {
width: 20,
padding: 3,
marginRight: 3,
alignItems: 'center',
justifyContent: 'center',
backgroundColor: BGWASH,
borderColor: 'transparent',
borderRadius: 3,
},
disabledButton: {
width: 20,
padding: 3,
marginRight: 3,
alignItems: 'center',
justifyContent: 'center',
backgroundColor: DISABLED_WASH,
borderColor: 'transparent',
borderRadius: 3,
},
goButton: {
height: 24,
padding: 3,
marginLeft: 8,
alignItems: 'center',
backgroundColor: BGWASH,
borderColor: 'transparent',
borderRadius: 3,
alignSelf: 'stretch',
},
statusBar: {
flexDirection: 'row',
alignItems: 'center',
paddingLeft: 5,
height: 22,
},
statusBarText: {
color: 'white',
fontSize: 13,
},
spinner: {
width: 20,
marginRight: 6,
},
buttons: {
flexDirection: 'row',
height: 30,
backgroundColor: 'black',
alignItems: 'center',
justifyContent: 'space-between',
},
button: {
flex: 0.5,
width: 0,
margin: 5,
borderColor: 'gray',
borderWidth: 1,
backgroundColor: 'gray',
},
});
const HTML = `
<!DOCTYPE html>\n
<html>
<head>
<title>Hello Static World</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=320, user-scalable=no">
<style type="text/css">
body {
margin: 0;
padding: 0;
font: 62.5% arial, sans-serif;
background: #ccc;
}
h1 {
padding: 45px;
margin: 0;
text-align: center;
color: #33f;
}
</style>
</head>
<body>
<h1>Hello Static World</h1>
</body>
</html>
`;
exports.displayName = (undefined: ?string);
exports.title = '<WebView>';
exports.description = 'Base component to display web content';
exports.examples = [
{
title: 'Simple Browser',
render(): ReactElement<any> { return <WebViewExample />; }
},
{
title: 'Scale Page to Fit',
render(): ReactElement<any> { return <ScaledWebView/>; }
},
{
title: 'Bundled HTML',
render(): ReactElement<any> {
return (
<WebView
style={{
backgroundColor: BGWASH,
height: 100,
}}
source={require('./helloworld.html')}
scalesPageToFit={true}
/>
);
}
},
{
title: 'Static HTML',
render(): ReactElement<any> {
return (
<WebView
style={{
backgroundColor: BGWASH,
height: 100,
}}
source={{html: HTML}}
scalesPageToFit={true}
/>
);
}
},
{
title: 'POST Test',
render(): ReactElement<any> {
return (
<WebView
style={{
backgroundColor: BGWASH,
height: 100,
}}
source={{
uri: 'http://www.posttestserver.com/post.php',
method: 'POST',
body: 'foo=bar&bar=foo'
}}
scalesPageToFit={false}
/>
);
}
}
];
AppRegistry.registerComponent('test', () => WebViewExample);
如果有人可以帮我解决这个问题，我将非常感激！