pod 遇到无法 pod install 或者 pod update Pods written in Swift can only be integrated as frameworks; this

今天在用pod更新 pod 里面的最新工程的库的时候。遇到了下面的问题。

[!] Pods written in Swift can only be integrated as frameworks; this feature is still in beta. Add `use_frameworks!` to your Podfile or target to opt into using it. The Swift Pods being used are: ReactiveCocoa
and Result

很是，奇怪，用了各种方法没有解决后来添加了，重新修改Ppdfile里面添加  use_frameworks!  sdf添加这个就运行pod install 或者 pod update 就一切正常了，感觉这个问题很操蛋