我有一个问题。我仍然是反应本地的新手，但我找不到与我的问题相关的任何内容。不在谷歌的反应/反应原生文档中。
我在上一个项目中已经遇到过这个问题，但我从来没有完成它，也没有试过解决它。
所以问题是：
如果我使用react-native-navigation中的this.setState()或this.props.navigator.resetTo()，那么在我触摸显示屏或旋转设备之前，它什么都不做。此外，它足以聚焦和取消焦点ios模拟器。
在输入内容之前，似乎JS线程暂停了。当我使用mobx observable时也会发生这种情况。但是使用observable时，其频率不会高于setState()。这就是为什么我将所有本地状态移动到本地mobx商店，它改善了我的情况，但有时仍然发生反应本机某种方式等待触摸输入。我还试过的一件事是将resetTo()包裹在requestAnimationFrame()中，这也改善了我的情况。
现在是一个示例代码：
这是我打开领域数据库的初始屏幕。
import React, {Component} from 'react';
import {View, Dimensions} from 'react-native';
import Schema from '../Schema';
import {Everything, Untis, NavigateEverywhere} from '../Stores/index';
import {Text} from 'react-native-elements';
// import * as Progress from 'react-native-progress';
import percentage from 'percentage-calc';
import Realm from 'realm';
import {observable} from "mobx"
import {observer} from 'mobx-react';
import {MKProgress} from 'react-native-material-kit';
@observer
class Database extends Component {
constructor(props) {
super(props);
console.ignoreWarnings = ['Realm.openAsync'];
NavigateEverywhere.setNavigator(this.props.navigator);
}
// state = {
// statusText: 'Initializing Database...',
// uploadProgress: 0,
// downloadProgress: 0,
// uploadMax: 0,
// downloadMax: 0,
// uploadCurrent: 0,
// downloadCurrent: 0,
// workingUpload: false,
// workingDownload: false,
// realmHost: this.realmHost,
// realmServer: `http://${this.realmHost}/`,
// realm: `realm://${this.realmHost}/~/sitnu`
// };
@observable statusText = 'Initializing Database...';
@observable uploadProgress = 0;
@observable downloadProgress = 0;
@observable uploadMax = 0;
@observable downloadMax = 0;
@observable uploadCurrent = 0;
@observable downloadCurrent = 0;
@observable workingUpload = false;
@observable workingDownload = false;
realmHost = '';
realmServer = `http://${this.realmHost}/`;
realm = `realm://${this.realmHost}/~/sitnu`;
componentDidMount() {
this.bootStrap().catch(console.error);
}
async bootStrap() {
let user;
if (this.props.token && this.props.provider) {
try {
user = await Realm.Sync.User.registerWithProvider(this.realmServer, {
provider: this.props.provider,
providerToken: this.props.token
});
} catch (e) {
return this.props.navigator.resetTo({
screen: 'io.LoginRealm',
title: 'Login into Realm',
passProps: {
error: e
}
});
}
}
if (this.props.username && this.props.password) {
try {
user = await new Promise((resolve, reject) => {
Realm.Sync.User.login(this.realmServer, this.props.username, this.props.password, (err, u) => {
if (err) return reject(err);
resolve(u);
});
});
} catch (e) {
return this.props.navigator.resetTo({
screen: 'io.LoginRealm',
title: 'Login into Realm',
passProps: {
error: e
}
});
}
}
let users = [];
for (let key in Realm.Sync.User.all) {
users.push(Realm.Sync.User.all[key]);
}
if (users.length !== 0 && !user) {
user = users[0];
}
if (!user) {
return this.props.navigator.resetTo({
screen: 'io.LoginRealm',
title: 'Login into Realm',
passProps: {
error: 'user is undefined or null'
}
});
}
let realm;
try {
realm = await new Promise((resolve, reject) => {
Realm.openAsync({
schema: Schema,
sync: {
user: user,
url: this.realm
}
}, (error, realm) => {
if (error) return reject(error);
resolve(realm);
}, this.downloadCallback.bind(this));
});
} catch (e) {
console.log("Why");
return requestAnimationFrame(() => {
this.props.navigator.resetTo({
screen: 'io.LoginRealm',
title: 'Login into Realm',
passProps: {
error: e
}
});
});
}
this.workingUpload = false;
this.workingDownload = false;
this.statusText = 'Finishing Database...';
Everything.setRealm(realm);
const username = realm.objectForPrimaryKey('KeyValue', 'username');
const password = realm.objectForPrimaryKey('KeyValue', 'password');
const host = realm.objectForPrimaryKey('KeyValue', 'host');
const school = realm.objectForPrimaryKey('KeyValue', 'school');
const setup = realm.objectForPrimaryKey('KeyValue', 'setup');
if (typeof username === 'object' && typeof password === 'object' && typeof host === 'object' && typeof school === 'object' && typeof setup === 'object' && username.value && password.value && host.value && school.value && setup.value) {
Everything.setCredentials(username.value, password.value, host.value, school.value);
Untis.setSettings(username.value, password.value, host.value, school.value);
requestAnimationFrame(() => {
this.props.navigator.resetTo({
screen: 'io.Home',
animated: true,
title: 'Home'
});
});
} else {
requestAnimationFrame(() => {
this.props.navigator.resetTo({
screen: 'io.Login',
animated: true,
navigatorStyle: {
navBarHidden: true,
statusBarTextColorSchemeSingleScreen: 'dark'
}
});
});
}
}
downloadCallback = async (transferred, transferable) => {
this.workingDownload = true;
this.downloadMax = transferable;
this.downloadCurrent = transferred;
this.downloadProgress = percentage.from(transferred, transferable) / 100;
this.statusText = 'Sync Database';
};
render() {
return (
<View style={{
alignContent: "center",
alignItems: "center",
alignSelf: "center",
flex: 1,
justifyContent: "center"
}}>
<Text h5>{this.statusText ? <Text>{this.statusText}</Text> : null}</Text>
{this.workingUpload ? <View>
{/*<Progress.Bar progress={this.uploadProgress}/>*/}
<MKProgress style={{width: Dimensions.get('window').width - 40}} progress={this.uploadProgress}/>
<Text>Upload {this.uploadCurrent ?
<Text>{this.uploadCurrent}</Text> : null}/{this.uploadMax ?
<Text>{this.uploadMax}</Text> : null}</Text>
</View> : null}
{this.workingDownload ? <View style={{
alignContent: 'center',
alignItems: 'center',
alignSelf: 'center',
justifyContent: 'center'
}}>
{/*<Progress.Bar progress={this.downloadProgress}/>*/}
<MKProgress style={{width: Dimensions.get('window').width - 40}} progress={this.downloadProgress}/>
<Text>Download {this.downloadCurrent ?
<Text>{this.downloadCurrent}</Text> : null}/{this.downloadMax ?
<Text>{this.downloadMax}</Text> : null}</Text>
</View> : null}
</View>
);
}
}
export default Database;
也许这只是一些完全愚蠢的事情，我只是没有看到它，但我已经尝试过许多事情而且不知道该怎么做。
问候Nils
答案 0 :(得分：0)
我有一次类似的问题。此问题来自react-native调试桥。尝试禁用调试模式。或者，如果它不起作用，请尝试生成＆amp;安装发布版本。
答案 1 :(得分：0)
右键单击浏览器并打开检查元素模式。然后选择调试器菜单。在那里你会找到一个选项＆＃34;暂停脚本执行错误＆＃34; 。启用此选项。如果任何线程停止或有任何错误，脚本执行将停止，您可以在控制台上看到错误。如果你还面临问题，请告诉我。