cocoapods更新到最新版本

1.rvm list known列出ruby可安装的版本信息

2. 此处我安装的是2.6.3 （命令rvm install 2.6.3）

3.which pod找出以前的pod路径；

/usr/local/bin/pod

4. 移除旧pod，rm -rf /usr/local/bin/pod

5. sudo gem install cocoapods安装；

platojobs@PlatoJobsdeMacBook-Pro ~ % rvm list known
# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.10]
[ruby-]2.3[.8]
[ruby-]2.4[.6]
[ruby-]2.5[.5]
[ruby-]2.6[.3]
[ruby-]2.7[.0-preview1]
ruby-head

# for forks use: rvm install ruby-head-<name> --url https://github.com/github/ruby.git --branch 2.2

# JRuby
jruby-1.6[.8]
jruby-1.7[.27]
jruby-9.1[.17.0]
jruby[-9.2.7.0]
jruby-head

# Rubinius
rbx-1[.4.3]
rbx-2.3[.0]
rbx-2.4[.1]
rbx-2[.5.8]
rbx-3[.107]
rbx-4[.3]
rbx-head

# TruffleRuby
truffleruby[-19.1.0]

# Opal
opal

# Minimalistic ruby implementation - ISO 30170:2012
mruby-1.0.0
mruby-1.1.0
mruby-1.2.0
mruby-1.3.0
mruby-1[.4.1]
mruby-2[.0.1]
mruby[-head]

# Ruby Enterprise Edition
ree-1.8.6
ree[-1.8.7][-2012.02]

# Topaz
topaz

# MagLev
maglev-1.0.0
maglev-1.1[RC1]
maglev[-1.2Alpha4]
maglev-head

# Mac OS X Snow Leopard Or Newer
macruby-0.10
macruby-0.11
macruby[-0.12]
macruby-nightly
macruby-head

# IronRuby
ironruby[-1.1.3]
ironruby-head
platojobs@PlatoJobsdeMacBook-Pro ~ % rvm install 2.6.3
Already installed ruby-2.6.3.
To reinstall use:

    rvm reinstall ruby-2.6.3

platojobs@PlatoJobsdeMacBook-Pro ~ % which pod
/usr/local/bin/pod
platojobs@PlatoJobsdeMacBook-Pro ~ % rm -rf /usr/local/bin/pod
platojobs@PlatoJobsdeMacBook-Pro ~ % 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 33 seconds
6 gems installed
platojobs@PlatoJobsdeMacBook-Pro ~ % pod --version
1.9.1
platojobs@PlatoJobsdeMacBook-Pro ~ %