How to enable Swift support for existing project in flutter

问题

I want to know if there is a way to enable swift support for flutter project. I only enabled Kotlin support while creating the project. I need to enable Swift too. Is there a command I can execute or any setting in flutter plugin for Android studio where I can enable or is there is an option to enable in Xcode?

This is what I want to do but for existing Flutter project

回答1:

1. Delete existing ios folder from root of flutter project.
2. Run this command flutter create -i swift .

This command will create only ios directory with swift support.

回答2:

Well, I search the same thing now, also I enable the kotlin support... so, how to enable swift or kotlin support for a existing proyect?

1. For swift support, you need to move your ios folder to outside of your project folder, if you don't have any change in files inside of this folder(like info.plist, appDelegate, Podfile or Splash Screens), you can delete it.
2. Run the command below in terminal/cmd, on root folder of your proyect...
   -i swift is for swift
   -a kotlin is for kotlin (You don't need delete anything before)
   You can use only one of these or both, (Don't forget the period "." at the end of the command)

    flutter create -i swift -a kotlin .

3. *Apply again your changes on the iOS folder (aka info.plist), now in Runner folder, now you don't have main.m and AppDelegate.h files, instead you have AppDelegate.swift in swift language, so if you need to put APIs there the code is different.

4. *If you apply -a kotlin line, check your previosly changes on files in Android folder(example: verify the AndroidX migration code in build.gradle - gradle.properties, verify the manifest), because the command add some code or change completely some files.

   Also if you want, you can delete the android/app/src/main/java folder because now the app use kotlin folder

回答3:

Little known secret -- you can run flutter create . in your Flutter app directory and it will repair the project, recreating any files that are missing. So if you already have a project created with Objective-C and Java, you can run:

flutter create . -i swift -a kotlin

to convert the host app to Kotlin and Swift.

(Ignore Kotlin you you want, but my experience is that just leave it there)

回答4:

Bridging Header must be created. Open the project with XCode. Then choose File -> New -> File -> Swift File. A dialog will be displayed when creating the swift file(Since this file is deleted, any name can be used.). XCode will ask you if you wish to create Bridging Header, click yes. Make sure you have use_frameworks! in the Runner block, in ios/Podfile。 Make sure you have SWIFT_VERSION 4.2 selected in you XCode -> Build Settings Do flutter clean Go to your ios folder, delete Podfile.lock and Pods folder and then execute pod install --repo-update

回答5:

For the scenario where you already have an ios module partially written in Objective-C, and now just want to use Swift code alongside, than I suggest you to right click on ios in project window and choose Open iOS module in XCode this from context menu

Than you can just follow those instructions: https://developer.apple.com/documentation/swift/imported_c_and_objective-c_apis/importing_swift_into_objective-c

If your plan is to rewrite module in swift than I'd create a new project with the same name as your original one and turned on Swift support. Than I'd just copy the whole ios module to your original project.

来源：https://stackoverflow.com/questions/52244346/how-to-enable-swift-support-for-existing-project-in-flutter