Cocoapods不会安装?

Cocoapods will not install?

[!] Unable to find a specification for `Firebase/Analytics`

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 * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.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.

我过去曾在许多项目中毫不费力地添加了 pods,但现在,不会安装新的 pods。我运行 pod repo更新,我更新了我的Cocoapods版本,转use_frameworks!断断续续,我没主意了。

这是 Podfile

# Uncomment the next line to define a global platform for your project
platform :ios, '13.0'

target 'My App' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!
  #use_modular_headers!

  # Pods for My App
  pod 'RxSwift'
  pod 'RxAlamofire'
  pod 'Alamofire'
  pod 'Fabric'
  pod 'Crashlytics'
  source 'https://github.com/lixiang1994/Specs'
  pod 'Loading'

end

将此添加到文件顶部:

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

如果没有其他来源,Cocoapods 将默认添加该来源。通过添加您自己的来源,Cocoapods 假设一切都可以在那里找到。