更新flutte 或者原有的multi_image_picker

报错

[!] CDN: trunk Repo update failed - 4 error(s):
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/c/7/9/Reachability/3.0.0/Reachability.podspec.json Response: Couldn't connect to server
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/c/7/9/Reachability/3.1.0/Reachability.podspec.json Response: Couldn't connect to server
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/c/7/9/Reachability/3.1.1/Reachability.podspec.json Response: Couldn't connect to server
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/c/7/9/Reachability/3.2/Reachability.podspec.json Response: Couldn't connect to server

先在终端执行

pod repo remove trunk

若是更新 pod 库的时候失败，则需要在 podfile 添加

source 'https://github.com/CocoaPods/Specs.git'

podfile 文件中添加 source 源后，pod install 和 pod update 就可以正常操作

image.png

2.报错，

[!] CocoaPods could not find compatible versions for pod "BSImagePicker":
  In snapshot (Podfile.lock):
    BSImagePicker (= 2.10.0, ~> 2.10.0)

  In Podfile:
    multi_image_picker (from `.symlinks/plugins/multi_image_picker/ios`) was resolved to 4.6.7, which depends on
      BSImagePicker (~> 2.10.3)

Specs satisfying the `BSImagePicker (= 2.10.0, ~> 2.10.0), BSImagePicker (~> 2.10.3)` dependency were found, but they required a higher minimum deployment target.

大概就是 BSImagePicker 这个可以对应的版本2.10.3没有找到 ，我们可以在终端 搜索一下这个库
执行

pod search BSImagePicker

image.png

可以上得到当前最高版本为 BSImagePicker (~> 2.10.0) 这个时候我们修改flutter 里面multi_image_picker 库对应的依赖BSImagePicker的版本就行了 如下图

image.png

然后pod install 搞定