android - NSnull 类型的 JSON 值无法转换为 NSString
<p><p>我的 react-native Firebase APL 有一个奇怪的错误。</p>
<p>react-native run-android 工作正常，没有错误。</p>
<p>但是 react-native run-ios 失败，NSnull 类型的 JSON 值无法转换为 NSString。</p>
<p>源代码如下。(主要和注册类在firebase上进行身份验证工作)</p>
<p>我认为 Firebase Class 在 ios 和 Android 上有不同的 ACT 来将 JSON 转换为文本。</p>
<p>任何建议表示赞赏。</p>
<p>商事</p>
<p>主要</p>
<p>//在此处初始化firebase应用，并根据需要将其传递给其他组件。仅在启动时初始化。</p>
<pre><code> const firebaseApp = firebase.initializeApp(firebaseConfig);
var GiftedMessenger = require('react-native-gifted-messenger');
let styles = {}
class Pricing extends Component {
constructor(props){
super(props);
this.state = {
page: null
};
/* this.itemsRef = this.getRef().child('items'); */
}
componentWillMount(){
// We must asynchronously get the auth state, if we use currentUser here, it'll be null
const unsubscribe = firebaseApp.auth().onAuthStateChanged((user) => {
// If the user is logged in take them to the accounts screen
if (user != null) {
this.setState({page: Account});
console.log('(user != null)')
return;
}
// otherwise have them login
console.log('(user != Login)')
this.setState({page: Login});
// unsubscribe this observer
unsubscribe();
});
}
render() {
if (this.state.page) {
return (
// Take the user to whatever page we set the state to.
// We will use a transition where the new page will slide in from the right.
<Navigator
initialRoute={{component: this.state.page}}
configureScene={() => {
return Navigator.SceneConfigs.FloatFromRight;
}}
renderScene={(route, navigator) => {
if(route.component){
// Pass the navigator the the page so it can navigate as well.
// Pass firebaseApp so it can make calls to firebase.
return React.createElement(route.component, { navigator, firebaseApp});
}
}} />
);
} else {
return (
// Our default loading view while waiting to hear back from firebase
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我在这个BUG中深度调试。
最后找到如下。</p>
<pre><code><Image
source={{uri: 'this.state.user.photoURL'}} <<<single quotation was added.
style={styles.image}
/>
</code></pre>
<p>没想到会出现这种错误。</p>
<p>谢谢庄司</p></p>
<p style="font-size: 20px;">关于android - NSnull 类型的 JSON 值无法转换为 NSString，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/40814806/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/40814806/
</a>
</p>
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