flutter v1.17.0 安装后 iOS 端不能直接工作 【带解决办法】

[GuoDapeng]

这个问题很有可能是 flutter 自己的bug，反正不是很友好。

当你把插件添加到 pubspec.yaml 文件，flutter pub get 后，直接运行 iOS 端应该是遇到一些问题。android端能正常运行，只有一段下面这种看着不舒服的提示。

注: /Users/felix/.pub-cache/hosted/pub.flutter-io.cn/multi_image_picker-4.6.7/android/src/main/java/com/vitanov/multiimagepicker/FileDirectory.java使用或覆盖了已过时的 API。
注: 有关详细信息, 请使用 -Xlint:deprecation 重新编译。

iOS 你应该会看到的日志： 大概这个样子。

Launching lib/main.dart on 郭大鹏的iPhone in debug mode...
Signing iOS app for device deployment using developer identity: "Apple Development: [email protected] (M4243PURVY)"
Running pod install...                                              1.2s
CocoaPods' output:
↳
      Preparing

    Analyzing dependencies

    Inspecting targets to integrate
      Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)

    Fetching external sources
    -> Fetching podspec for `Flutter` from `Flutter`
    -> Fetching podspec for `multi_image_picker` from `.symlinks/plugins/multi_image_picker/ios`

    Resolving dependencies of `Podfile`
      CDN: trunk Relative path: CocoaPods-version.yml exists! Returning local because checking is only perfomed in repo update
    [!] CocoaPods could not find compatible versions for pod "multi_image_picker":
      In Podfile:
        multi_image_picker (from `.symlinks/plugins/multi_image_picker/ios`)

    Specs satisfying the `multi_image_picker (from `.symlinks/plugins/multi_image_picker/ios`)` dependency were found, but they required a higher minimum deployment target.

    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:328:in `raise_error_unless_state'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:310:in `block in unwind_for_conflict'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:308:in `tap'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:308:in `unwind_for_conflict'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:684:in `attempt_to_activate'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:254:in `process_topmost_state'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:182:in `resolve'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolver.rb:43:in `resolve'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:94:in `resolve'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/installer/analyzer.rb:1065:in `block in resolve_dependencies'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/user_interface.rb:64:in `section'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/installer/analyzer.rb:1063:in `resolve_dependencies'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/installer/analyzer.rb:124:in `analyze'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/installer.rb:410:in `analyze'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/installer.rb:235:in `block in resolve_dependencies'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/user_interface.rb:64:in `section'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/installer.rb:234:in `resolve_dependencies'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/installer.rb:156:in `install!'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/command/install.rb:52:in `run'
    /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/lib/cocoapods/command.rb:52:in `run'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.1/bin/pod:55:in `<top (required)>'
    /usr/local/bin/pod:23:in `load'
    /usr/local/bin/pod:23:in `<main>'

Error output from CocoaPods:
↳

    [!] 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`.

Exception: Error running pod install

打开 Xcode ，你应该看到一堆红字。

Showing Recent Issues
/Users/felix/EasyWork/Project/lightEnter/other/qingLive/project/applive_flutter/applive/ios/Flutter/Debug.xcconfig:1: could not find included file 'Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig' in search paths

然后使用终端进入 iOS 项目目录运行 pod install，会有下面的提示。这时候不要慌张。

$ pod install
Analyzing dependencies
[!] CocoaPods could not find compatible versions for pod "multi_image_picker":
  In Podfile:
    multi_image_picker (from `.symlinks/plugins/multi_image_picker/ios`)

Specs satisfying the `multi_image_picker (from `.symlinks/plugins/multi_image_picker/ios`)` dependency were found, but they required a higher minimum deployment target.

[!] 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`.

修改 iOS 项目目录下面的 Podfile 文件，在 flutter v1.17.0 版本中，貌似这个文件只有在 flutter 插件时才会出现，我记得以前不是这样的。可能是幻觉。我将 platform :ios, '13.0' 这个设置为 iOS13 了，因为我计划使用 switchUI 写部分功能。之后在终端 iOS项目目录执行 pod install。经过漫长的等待（我这里网络的问题），看到下面提示。

$ pod install
Analyzing dependencies
Downloading dependencies
Installing BSGridCollectionViewLayout (1.2.5)
Installing BSImagePicker (2.10.3)
Installing BSImageView (1.0.3)
Installing Flutter (1.0.0)
Installing multi_image_picker (4.6.7)
Generating Pods project
Integrating client project
Pod installation complete! There are 2 dependencies from the Podfile and 5 total pods installed.

[!] CocoaPods did not set the base configuration of your project because your project already has a custom config set. In order for CocoaPods integration to work at all, please either set the base configurations of the target `Runner` to `Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig` or include the `Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig` in your build configuration (`Flutter/Release.xcconfig`).

这时候 Xcode 会弹出一个提示，意思是 Xcode 项目有一些变化，你需要决定一下，是使用现在打开的覆盖硬盘上的，还是读取硬盘上的丢弃现在打开的，我选择了后者，Xcode Version 11.4.1 (11E503a) 这个版本，是左边的按钮。我忘记截图了。

然后和想的还是不一样，Pods 这个项目看不见，不过没关系，关闭Xcode在打开一次就好了，我是在 Android studio 中右键打开的。

之后就能运行了。