如何在设备上运行Ionic 2应用程序时加速启动时间

Question

我目前正在使用Ionic 2 Angular2和TypeScript创建一个应用程序。但是，我在启动应用程序的速度方面遇到了大问题。当我将应用程序编译为dev或prod环境并安装在任何设备上时，加载时间非常长。

当我启动应用程序时，它显示白屏并停留很长时间，这非常令人恼火，因为用户不会等待那么久。

我已经删除了splashscreen cordova插件，并在config.xml中将splashscreen延迟设置为0，但加载时间仍然很长。

在启动我的应用程序时，只进行了几个Get请求。以下是我的当前Config.xml。

<widget id="com.ionicframework.comvltapp596066" version="0.0.1" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0">
    <name>com.vlt.app</name>
    <description>An awesome Ionic/Cordova app.</description>
    <author email="hi@ionicframework" href="http://ionicframework.com/">Ionic Framework Team</author>
    <content src="index.html" />
    <access origin="*" />
    <allow-navigation href="http://ionic.local/*" />
    <allow-intent href="http://*/*" />
    <allow-intent href="https://*/*" />
    <allow-intent href="tel:*" />
    <allow-intent href="sms:*" />
    <allow-intent href="mailto:*" />
    <allow-intent href="geo:*" />
    <preference name="webviewbounce" value="false" />
    <preference name="UIWebViewBounce" value="false" />
    <preference name="DisallowOverscroll" value="true" />
    <preference name="android-minSdkVersion" value="16" />
    <preference name="BackupWebStorage" value="none" />
    <preference name="SplashMaintainAspectRatio" value="true" />
    <preference name="FadeSplashScreenDuration" value="2" />
    <preference name="SplashShowOnlyFirstTime" value="true" />
    <preference name="SplashScreen" value="screen" />
    <preference name="SplashScreenDelay" value="0" />
    <platform name="android">
        <allow-intent href="market:*" />
        <icon density="ldpi" src="resources/android/icon/drawable-ldpi-icon.png" />
        <icon density="mdpi" src="resources/android/icon/drawable-mdpi-icon.png" />
        <icon density="hdpi" src="resources/android/icon/drawable-hdpi-icon.png" />
        <icon density="xhdpi" src="resources/android/icon/drawable-xhdpi-icon.png" />
        <icon density="xxhdpi" src="resources/android/icon/drawable-xxhdpi-icon.png" />
        <icon density="xxxhdpi" src="resources/android/icon/drawable-xxxhdpi-icon.png" />
        <splash density="land-ldpi" src="resources/android/splash/drawable-land-ldpi-screen.png" />
        <splash density="land-mdpi" src="resources/android/splash/drawable-land-mdpi-screen.png" />
        <splash density="land-hdpi" src="resources/android/splash/drawable-land-hdpi-screen.png" />
        <splash density="land-xhdpi" src="resources/android/splash/drawable-land-xhdpi-screen.png" />
        <splash density="land-xxhdpi" src="resources/android/splash/drawable-land-xxhdpi-screen.png" />
        <splash density="land-xxxhdpi" src="resources/android/splash/drawable-land-xxxhdpi-screen.png" />
        <splash density="port-ldpi" src="resources/android/splash/drawable-port-ldpi-screen.png" />
        <splash density="port-mdpi" src="resources/android/splash/drawable-port-mdpi-screen.png" />
        <splash density="port-hdpi" src="resources/android/splash/drawable-port-hdpi-screen.png" />
        <splash density="port-xhdpi" src="resources/android/splash/drawable-port-xhdpi-screen.png" />
        <splash density="port-xxhdpi" src="resources/android/splash/drawable-port-xxhdpi-screen.png" />
        <splash density="port-xxxhdpi" src="resources/android/splash/drawable-port-xxxhdpi-screen.png" />
    </platform>
    <platform name="ios">
        <allow-intent href="itms:*" />
        <allow-intent href="itms-apps:*" />
        <icon height="57" src="resources/ios/icon/icon.png" width="57" />
        <icon height="114" src="resources/ios/icon/[e-mail]" width="114" />
        <icon height="40" src="resources/ios/icon/icon-40.png" width="40" />
        <icon height="80" src="resources/ios/icon/[e-mail]" width="80" />
        <icon height="120" src="resources/ios/icon/[e-mail]" width="120" />
        <icon height="50" src="resources/ios/icon/icon-50.png" width="50" />
        <icon height="100" src="resources/ios/icon/[e-mail]" width="100" />
        <icon height="60" src="resources/ios/icon/icon-60.png" width="60" />
        <icon height="120" src="resources/ios/icon/[e-mail]" width="120" />
        <icon height="180" src="resources/ios/icon/[e-mail]" width="180" />
        <icon height="72" src="resources/ios/icon/icon-72.png" width="72" />
        <icon height="144" src="resources/ios/icon/[e-mail]" width="144" />
        <icon height="76" src="resources/ios/icon/icon-76.png" width="76" />
        <icon height="152" src="resources/ios/icon/[e-mail]" width="152" />
        <icon height="167" src="resources/ios/icon/[e-mail]" width="167" />
        <icon height="29" src="resources/ios/icon/icon-small.png" width="29" />
        <icon height="58" src="resources/ios/icon/[e-mail]" width="58" />
        <icon height="87" src="resources/ios/icon/[e-mail]" width="87" />
        <splash height="1136" src="resources/ios/splash/Default-568h@2x~iphone.png" width="640" />
        <splash height="1334" src="resources/ios/splash/Default-667h.png" width="750" />
        <splash height="2208" src="resources/ios/splash/Default-736h.png" width="1242" />
        <splash height="1242" src="resources/ios/splash/Default-Landscape-736h.png" width="2208" />
        <splash height="1536" src="resources/ios/splash/Default-Landscape@2x~ipad.png" width="2048" />
        <splash height="2048" src="resources/ios/splash/Default-Landscape@~ipadpro.png" width="2732" />
        <splash height="768" src="resources/ios/splash/Default-Landscape~ipad.png" width="1024" />
        <splash height="2048" src="resources/ios/splash/Default-Portrait@2x~ipad.png" width="1536" />
        <splash height="2732" src="resources/ios/splash/Default-Portrait@~ipadpro.png" width="2048" />
        <splash height="1024" src="resources/ios/splash/Default-Portrait~ipad.png" width="768" />
        <splash height="960" src="resources/ios/splash/Default@2x~iphone.png" width="640" />
        <splash height="480" src="resources/ios/splash/Default~iphone.png" width="320" />
    </platform>
    <engine name="android" spec="^6.2.3" />
    <engine name="browser" spec="^4.1.0" />
    <plugin name="cordova-plugin-console" spec="1.0.5" />
    <plugin name="cordova-plugin-device" spec="1.1.4" />
    <plugin name="cordova-plugin-googlemaps" spec="^1.4.0">
        <variable name="API_KEY_FOR_ANDROID" value="AIzaSyALRGE9KkSD9Qpng8XR7vUaVNj1teJGhw4" />
    </plugin>
    <plugin name="cordova-plugin-inappbrowser" spec="^1.7.1" />
    <plugin name="cordova-plugin-statusbar" spec="2.2.2" />
    <plugin name="cordova-plugin-whitelist" spec="1.3.1" />
    <plugin name="cordova-sqlite-storage" spec="^2.0.4" />
    <plugin name="ionic-plugin-keyboard" spec="~2.2.1" />
</widget>

Please help!

- Kaki Master Of Time

Answer 1

根据我的经验，Ionic应用程序的启动时间并没有显著改善，但从在线文章中我了解到，您可以优化Ionic应用程序以使其启动和工作更快。

以下是一些优化建议：

1. 必要时使用 Ionicons 而不是图片。
2. 确保将 javascript 文件移到页面底部。
3. 不要使用不必要的库，如 JQuery。
4. 使用较少的页面或学习重复利用页面。
5. Ionic 3 还引入了懒加载，以避免在启动时加载所有组件。

请参阅此链接以获取更多详细信息。

- Emeka Obianom

---

非常感谢您的回复。但我仍然坚信，除了代码本身之外，还有其他原因导致启动缓慢，因为即使是模板或空白应用程序也会出现这种情况。 - Kaki Master Of Time

Answer 2

我同意@Emeka Obianom的看法，与我的团队一起在工作中花费了很多时间解决这些启动问题。我们仍然有一个漫长的启动过程。

在index.html上加入加载屏幕会让它更有趣一些。

如果您缩小JavaScript，可以稍微改进一下。

您可以在Android上使用类似https://www.guardsquare.com/en/proguard的工具。您也可以在网上找到苹果的免费解决方案。

- root1404