用这个包 agora_rtc_engine之后，IOS模拟器跑不起来了😢，报错如下：
➜ pika git:(zxs-dev) ✗ flutter run
Launching lib/main.dart on iPhone XR in debug mode...
Running pod install... 0.9s
CocoaPods' output:
↳
Preparing
Analyzing dependencies
Inspecting targets to integrate
Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)
Finding Podfile changes
- Flutter
- agora_rtc_engine
- city_pickers
- connectivity
- fluttertoast
- image_picker
- permission_handler
- screen
- shared_preferences
Fetching external sources
-> Fetching podspec for `Flutter` from `.symlinks/flutter/ios`
-> Fetching podspec for `agora_rtc_engine` from `.symlinks/plugins/agora_rtc_engine/ios`
-> Fetching podspec for `city_pickers` from `.symlinks/plugins/city_pickers/ios`
-> Fetching podspec for `connectivity` from `.symlinks/plugins/connectivity/ios`
-> Fetching podspec for `fluttertoast` from `.symlinks/plugins/fluttertoast/ios`
-> Fetching podspec for `image_picker` from `.symlinks/plugins/image_picker/ios`
-> Fetching podspec for `permission_handler` from `.symlinks/plugins/permission_handler/ios`
-> Fetching podspec for `screen` from `.symlinks/plugins/screen/ios`
-> Fetching podspec for `shared_preferences` from `.symlinks/plugins/shared_preferences/ios`
Resolving dependencies of `Podfile`
[!] CocoaPods could not find compatible versions for pod "AgoraRtcEngine_iOS":
In snapshot (Podfile.lock):
AgoraRtcEngine_iOS (= [2.4.0.1](2.4.0.1))
In Podfile:
agora_rtc_engine (from `.symlinks/plugins/agora_rtc_engine/ios`) was resolved to 2.4.0, which depends on
AgoraRtcEngine_iOS (= [2.4.0.1](2.4.0.1))
None of your spec sources contain a spec satisfying the dependency: `AgoraRtcEngine_iOS (= [2.4.0.1](2.4.0.1))`.
You have either:
* out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.
* mistyped the name or version.
* not added the source repo that hosts the Podspec to your Podfile.
Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by default.
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:328:in
`raise_error_unless_state'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:310:in `block in
unwind_for_conflict'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:308:in `tap'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:308:in
`unwind_for_conflict'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:257:in
`process_topmost_state'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:182:in `resolve'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/molinillo-0.6.6/lib/molinillo/resolver.rb:43:in `resolve'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/resolver.rb:123:in `resolve'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/installer/analyzer.rb:781:in `block
in resolve_dependencies'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/user_interface.rb:64:in `section'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/installer/analyzer.rb:779:in
`resolve_dependencies'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/installer/analyzer.rb:88:in
`analyze'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/installer.rb:243:in `analyze'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/installer.rb:154:in `block in
resolve_dependencies'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/user_interface.rb:64:in `section'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/installer.rb:153:in
`resolve_dependencies'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/installer.rb:116:in `install!'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/command/install.rb:41:in `run'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/lib/cocoapods/command.rb:52:in `run'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/gems/cocoapods-1.5.3/bin/pod:55:in `<top (required)>'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/bin/pod:22:in `load'
/usr/local/Cellar/cocoapods/1.5.3_1/libexec/bin/pod:22:in `<main>'
Error output from CocoaPods:
↳
[!] The version of CocoaPods used to generate the lockfile (1.6.1) is higher than the version of the current
executable (1.5.3). Incompatibility issues may arise.
[!] Automatically assigning platform `ios` with version `8.0` on target `Runner` because no platform was specified.
Please specify a platform for this target in your Podfile. See
`[https://guides.cocoapods.org/syntax/podfile.html#platform](https://guides.cocoapods.org/syntax/podfile.html#platform)`.
Error: CocoaPods's specs repository is too out-of-date to satisfy dependencies.
To update the CocoaPods specs, run:
pod repo update
Error running pod install
Error launching application on iPhone XR.
😄 解决方法：升级一下pod就行了
1、命令行输入 pod repo update
2、进入项目的IOS目录，运行命令 pod install
如果不希望 Column 撑满容器: mainAxisSize: MainAxisSize.min
用命令创建 Flutter 项目（据说这样创建的项目比较完整，这样说会不会被打😱）
flutter create --org=包名 --project-name=项目文件的名字 文件路径，例如：
// 会在当前目录，创建一个 demo 文件夹，flutter项目名称为 demo，包名 cn.demotech.demo
flutter create --org=cn.demotech --project-name=demo ./demo
其余配置信息可以通过 flutter create -h命令查看，自行配置
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