无法Pod install第三方库的解决办法

问题

当pod install时，迟迟pod不下来第三方库，多试几次也是失败，如下方所示：

Using TYPagerController (2.1.2)
Using UMCAnalytics (6.0.3)
Using UMCCommon (2.0.1)
Using UMCShare (6.9.5)
Installing WCDB (1.0.7.5)

[!] Error installing WCDB
[!] /usr/bin/git clone https://github.com/Tencent/wcdb.git /var/folders/m0/27747mqj6dl_fqjhn1xhc0_40000gn/T/d20190626-51408-1clv3zm --template= --single-branch --depth 1 --branch v1.0.7.5

Cloning into '/var/folders/m0/27747mqj6dl_fqjhn1xhc0_40000gn/T/d20190626-51408-1clv3zm'...
error: RPC failed; curl 56 LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 54
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed

解决办法：

• clone第三库的源代码，将源代码拷贝到Pod目录，路径为/Users/当前电脑的用户名/Library/Caches/CocoaPods/Pods/Release
  三方库
• 将xxx.podspec.json文件拷贝到pod的Specs目录下，具体路径为：/Users/当前电脑的用户名/Library/Caches/CocoaPods/Pods/Specs/Release
  podspec文件
• 再运行pod install，成功！
  WCDB安装成功