pod install 和 pod update的区别

pod install 和 pod update的区别
pod install（下载并安装pod）
1，当pod file文件中有“增加pod，删除pod，修改pod”的操作之后使用。
2，pod install执行完之后会将已下载的依赖库的版本号添加进podfile.lock文件
3，pod install根据podfile.lock文件列出的已安装的pod的版本信息，只负责下载安装podfile.lock中不存在的pod，不会自动更新已安装的pod的版本。

pod update （更新已存在的pod）
按规则将podfile文件中的pod更新到最新版本。并将pod版本信息写入podfile.lock

pod install

This is to be used the first time you want to retrieve the pods for the project, but also every time you edit your Podfile to add, update or remove a pod.

Every time the

pod install

command is run — and downloads and install new pods — it writes the version it has installed, for each pods, in the

Podfile.lock

file. This file keeps track of the installed version of each pod andlocks those versions.

When you run

pod install

, it only resolve dependencies for pods that are not already listed in the

Podfile.lock

.

For pods listed in the

Podfile.lock

, it downloads the explicit version listed in the

Podfile.lock

without trying to check if a newer version is available

For pods not listed in the

Podfile.lock

yet, it searches for the version that matches what is described in the

Podfile

(like in

pod 'MyPod', '~>1.2'

)

pod outdated

When you run

pod outdated

, CocoaPods will list all pods which have newer versions than the ones listed in the

Podfile.lock

(the versions currently installed for each pod). This means that if you run

pod update PODNAME

on those pods, they will be updated — as long as the new version still matches the restrictions like

pod 'MyPod', '~>x.y'

set in your

Podfile

.

pod update

When you run

pod update PODNAME

, CocoaPods will try to find an updated version of the pod

PODNAME

, without taking into account the version listed in

Podfile.lock

. It will update the pod to the latest version possible (as long as it matches the version restrictions in your

Podfile

).

If you run

pod update

with no pod name, CocoaPods will update every pod listed in your

Podfile

to the latest version possible.