Flutter 项目 pod install 报错[!] Unable to find a specification for `x x x` depended upon by `xxx`

错误详情

[!] Unable to find a specification for `x x x` depended upon by `xxx`

解决办法

添加 pod 官方的源地址到 Podfile 里

platform :ios, '8.0'
//添加这行
source 'https://github.com/CocoaPods/Specs.git'
target 'App' do
    pod 'TXLiteAVSDK_TRTC'
end