ios - pod install 和 pod update 的区别

Question

网上说，pod install会按照 pod 文件指定的版本安装，而pod update会安装最新版本，那么问题来了。

举个例子：

//使用大于等于0.1.2,小于0.2的版本
pod ‘AFNetworking’, ‘~>0.1.2′   

如果我现在的版本是0.1.2，最新版本是1.1.0，中间还有一个版本是0.1.9，那么pod install是哪个版本，pod update是哪个版本？

Answer 1

The following takes version 1.1.0.rc.2 as an example for explanation.
You can view the installed version via pod env.

   CocoaPods : 1.1.0.rc.2
        Ruby : ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
    RubyGems : 2.5.1
        Host : Mac OS X 10.11.6 (15G1004)
       Xcode : 8.0 (8A218a)
         Git : git version 2.8.4 (Apple Git-73)
Ruby lib dir : /usr/local/Cellar/ruby/2.3.1/lib
Repositories : master - https://github.com/CocoaPods/Specs.git @ 02982fffbac5c3b22e7b0c2a77515f865f0e1065

Installation Source

Executable Path: /usr/local/bin/pod

Plugins

cocoapods-deintegrate : 1.0.1
cocoapods-plugins     : 1.0.0
cocoapods-search      : 1.0.0
cocoapods-stats       : 1.0.0
cocoapods-trunk       : 1.0.0
cocoapods-try         : 1.1.0

Take pod ‘AFNetworking’, ‘~>0.1.2′ as an example

pod install 首先会检查 Podfile.lock 文件。如果里面的版本号符合该要求，0.1.x，比如是 0.1.3，则会按照指定的版本号进行安装。如果不符合，比如指定了 0.2.9，则会安装 0.1.9.

pod update 会忽略 Podfile.lock 文件。直接分析 Podfile file to install.

Answer 2

pod install, if it has not been installed before, the latest version of the restriction will be installed; if it has been installed, it will be the previously installed version.
pod update, the latest version of the restriction is installed.