xxx@xxxdeMacBook-Pro project-xxx % pod install
Analyzing dependencies
Downloading dependencies
Installing SDWebImage (5.3.1)
[!] Error installing SDWebImage
[!] /usr/bin/git clone https://github.com/SDWebImage/SDWebImage.git /var/folders/lp/j14k4s5x63j8fmx0fyfy22rr0000gn/T/d20200401-38323-1xttiw3 --template= --single-branch --depth 1 --branch 5.3.1
Cloning into '/var/folders/lp/j14k4s5x63j8fmx0fyfy22rr0000gn/T/d20200401-38323-1xttiw3'...
error: RPC failed; curl 56 LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 60
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
尝试方法：
方案一：
终端执行命令，然后pod install：
git config --global http.lowSpeedLimit 0
git config --global http.lowSpeedTime 999999
git config http.postBuffer 524288000
但依然不行。
方案二：sudo gem install cocoapods
xxx@xxxdeMacBook-Pro project-x % sudo gem install cocoapods
Password:
Fetching ffi-1.12.2.gem
Fetching ethon-0.12.0.gem
Fetching typhoeus-1.3.1.gem
Fetching cocoapods-core-1.9.1.gem
Fetching xcodeproj-1.15.0.gem
Fetching cocoapods-1.9.1.gem
Building native extensions. This could take a while...
Successfully installed ffi-1.12.2
Successfully installed ethon-0.12.0
Successfully installed typhoeus-1.3.1
Successfully installed cocoapods-core-1.9.1
Successfully installed xcodeproj-1.15.0
Successfully installed cocoapods-1.9.1
Parsing documentation for ffi-1.12.2
Installing ri documentation for ffi-1.12.2
Parsing documentation for ethon-0.12.0
Installing ri documentation for ethon-0.12.0
Parsing documentation for typhoeus-1.3.1
Installing ri documentation for typhoeus-1.3.1
Parsing documentation for cocoapods-core-1.9.1
Installing ri documentation for cocoapods-core-1.9.1
Parsing documentation for xcodeproj-1.15.0
Installing ri documentation for xcodeproj-1.15.0
Parsing documentation for cocoapods-1.9.1
Installing ri documentation for cocoapods-1.9.1
Done installing documentation for ffi, ethon, typhoeus, cocoapods-core, xcodeproj, cocoapods after 43 seconds
6 gems installed
然后pod install，经过漫长等待之后恢复正常。
xxx@xxxdeMacBook-Pro project-x % pod install
Analyzing dependencies
Downloading dependencies
Installing SDWebImage (5.3.1)
Generating Pods project
Integrating client project
Pod installation complete! There are 16 dependencies from the Podfile and 18 total pods installed.
