flutter - CocoaPods 找不到“edge_detection”构建颤振 iOS​​ 应用程序的兼容版本

Question

在尝试为 iOS 构建颤振应用程序后，我收到以下错误：

$ flutter build ios --no-codesign

Warning: Building for device with codesigning disabled. You will have to manually codesign before deploying to device.
Building com.example.mmpgui for device (ios-release)...
Running pod install...                                              0,8s
CocoaPods' output:
↳
      Preparing

    Analyzing dependencies

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

...

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

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

...

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`.

首先，我尝试按照链接中的建议，通过将平台版本设置为 10.0 来更新 Pod 文件（ios/Pods/Pod）

# Uncomment this line to define a global platform for your project
platform :ios, '10.0'

现在它编译了，但我得到了很多编译错误：

$ flutter build ios --no-codesign

Warning: Building for device with codesigning disabled. You will have to manually codesign before deploying to device.
Building com.example.mmpgui for device (ios-release)...
Running pod install...                                             38.3s
Running Xcode build...                                                  

Xcode build done.                                           665.5s
Failed to build iOS app
Error output from Xcode build:

    ** BUILD FAILED **

...

    error: the following command failed with exit code 0 but produced no further output
    CompileC
    /Users/administrator/Library/Developer/Xcode/DerivedData/Runner-gjlpspwywczpboarjfvvefatdons/Build/Intermediates.noindex/Pods.build/Release-iph
    oneos/camera.build/Objects-normal/arm64/CameraPlugin.o
    /Users/administrator/development/flutter/.pub-cache/hosted/pub.dartlang.org/camera-0.5.7+3/ios/Classes/CameraPlugin.m normal arm64 objective-c
    com.apple.compilers.llvm.clang.1_0.compiler
    /Users/administrator/development/flutter/.pub-cache/hosted/pub.dartlang.org/edge_detection-1.0.4/ios/Classes/HomeViewController.swift:29:49:
    error: value of optional type 'UIImage?' must be unwrapped to a value of type 'UIImage'
            var imagePath = saveImage(image:results.scannedImage)
                                                    ^
    /Users/administrator/development/flutter/.pub-cache/hosted/pub.dartlang.org/edge_detection-1.0.4/ios/Classes/HomeViewController.swift:29:49:
    note: coalesce using '??' to provide a default when the optional value contains 'nil'
            var imagePath = saveImage(image:results.scannedImage)
                                                    ^
                                                                 ?? <#default value#>
    /Users/administrator/development/flutter/.pub-cache/hosted/pub.dartlang.org/edge_detection-1.0.4/ios/Classes/HomeViewController.swift:29:49:
    note: force-unwrap using '!' to abort execution if the optional value contains 'nil'
            var imagePath = saveImage(image:results.scannedImage)

颤振医生显示以下内容：

$ flutter doctor -v
[✓] Flutter (Channel master, v1.15.3-pre.37, on Mac OS X 10.14.6 18G3020, locale de-AT)
    • Flutter version 1.15.3-pre.37 at /Users/sebastiankubeck/Software/flutter
    • Framework revision 6dc3bfaa98 (2 days ago), 2020-02-07 18:28:02 -0800
    • Engine revision 6158f03ef5
    • Dart version 2.8.0 (build 2.8.0-dev.8.0 514a8d4c84)


[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/sebastiankubeck/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C504
    • CocoaPods version 1.8.4

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 3.5)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 40.2.2
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] VS Code (version 1.41.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.8.0

[✓] Connected device (3 available)
    • macOS      • macOS      • darwin-x64     • Mac OS X 10.14.6 18G3020
    • Chrome     • chrome     • web-javascript • Google Chrome 80.0.3987.87
    • Web Server • web-server • web-javascript • Flutter Tools

• No issues found!

该项目是用旧版本的颤振创建的，似乎 ios 目录没有正确更新。或者，可能是我的CocoaPods版本太新，所以我尝试了1.7.5，也没有成功。

标签： flutter