Swift CocoaPod导入框架报错

导入框架报错：

Pods written in Swift can only be integrated as frameworks;

add 'use_frameworks!' to your Podfile or target to opt into using it.

The swift Pods being used are: ReactiveCocoa and Result

原因：1，导入框架版本号过高，应当先移除较低版本，然后再导入；2，podfile文件格式写错了，正确格式如下：