pod repo update

报错：环信的错误 ， 最后是怎么解决的

[!] CocoaPods could not find compatible versions for pod "Hyphenate":

  In Podfile:

    EaseUI (from `https://github.com/easemob/easeui-ios-hyphenate-cocoapods.git`) was resolved to 3.5.3, which depends on

      Hyphenate (~> 3.5.3)

    Hyphenate

Specs satisfying the `Hyphenate, Hyphenate (~> 3.5.3)` dependency were found, but they required a higher minimum deployment target.

解决办法：

pod repo update

之后再pod install就可以了。