{"id":2140,"date":"2019-08-05T14:56:22","date_gmt":"2019-08-05T09:26:22","guid":{"rendered":"https:\/\/www.concettolabs.com\/blog\/?p=2140"},"modified":"2019-08-05T14:56:22","modified_gmt":"2019-08-05T09:26:22","slug":"ios-application-bundle-by-flutter","status":"publish","type":"post","link":"https:\/\/websitelaravel.concettoprojects.com\/blog\/ios-application-bundle-by-flutter\/","title":{"rendered":"iOS Application Bundle By Flutter"},"content":{"rendered":"

In today\u2019s article, we gonna discuss how Flutter\u2019s build system converts Flutter project with its goods into an iOS application bundle.<\/p>\n

We will also let you know the purpose of generated objects so that it can help you to integrate the same processes with your custom build environment.<\/p>\n

<\/span>First Let\u2019s Discuss the Workflow:<\/span><\/h2>\n

When your application is ready to release to make the build process easy you can use Flutter tooling as it helps to make the entire build process easy.<\/p>\n

But some of the developers didn\u2019t think this way and they don\u2019t find the process as configurable for their custom build or CI (Continuous Integration) setups.<\/p>\n

If you have a custom Xcode build than all the vision added by Flutter tooling is optional and you can configure the build that suits your workflow.<\/p>\n

These all information we discuss applies to iOS applications bundles prepared for release to the App Store which means projects built to Flutter\u2019s release mode<\/span><\/a>.<\/p>\n

To support toolings such as observatory and hot reload profile mode uses a different runtime and packaging model.<\/p>\n

<\/span>Similar App bundle like iOS:<\/span><\/h3>\n

\"<\/p>\n

If you want to create similar to a typical iOS app bundle then you can use the flutter build iOS – release command that contains the application executable along with any referenced framework and resources.<\/p>\n

<\/span>What required to compile the Application?<\/span><\/h2>\n

While the installation process starts to install the SDK, at that time flutter tools are cached on into the machine. To check the same you can see under bin\/cache directory which is available in the copy of the Flutter SDK.<\/p>\n

This directory contains all the versioned tool that is required to work with Flutter so you can integrate any step of the process into your own build system.<\/p>\n

<\/span>Let me introduce to you some of the files that are unique to Flutter\u2019s iOS app bundles – Flutter Engine Framework Bundle:<\/span><\/h3>\n

Flutter.framework directory bundled as an iOS framework bundle, that includes Flutter Engine and Assets that are referenced by the Flutter Engine.<\/p>\n

    \n
  1. Flutter Engine:<\/strong>
    \nInclude core libraries like file, network I\/O, file, accessibility, plugin architecture, and support, the Skia renderer and the DartVM.<\/li>\n
  2. Assets referenced by Flutter Engine:<\/strong>
    \nThis is just ICU data currently.<\/li>\n<\/ol>\n

    <\/span>Ahead-Of-Time Framework Hustle:<\/span><\/h3>\n

    An AOT snapshot of all the Dart application code that is written by the user is contained by the App.Framework bundle.<\/p>\n

    Whenever a release builds, the compiler performs the tree shaking on the Dart code<\/a><\/span>. Hence only the code that is used to end up in the bundle.<\/p>\n

    The necessary artifacts that are used to create the App.framework bundle are getting generated under machine tool cache by the gen_snapshot.<\/p>\n

    <\/span>The Ahead-Of-Time Snapshot:<\/span><\/h3>\n

    This library contains the ahead-of-time code that is compiled from Dart to Machine native bits.<\/p>\n

    The four main symbols contained by the snapshot library that gets generated by gen_snapshot and these symbols can be dumped by nm command.<\/p>\n

    For example:<\/strong><\/p>\n

    \n

    Runner.app\/Frameworks\/App.framework\/App (for architecture arm64):
    \n00000000004041a0 S _kDartIsolateSnapshotData
    \n0000000000009000 T _kDartIsolateSnapshotInstructions
    \n00000000003fc740 S _kDartVmSnapshotData
    \n0000000000005000 T _kDartVmSnapshotInstructions<\/p>\n<\/blockquote>\n

    <\/span>The purpose behind the AOT Snapshot:<\/strong><\/span><\/h3>\n

    1.\u00a0<\/strong>DartVM Snapshot:<\/strong><\/p>\n