bogon:xiangmukaungjia ybd$ pod install
Analyzing dependencies
Downloading dependencies
Installing Kingfisher (4.2.0)
[!] 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 Pod being used is: Kingfisher
解决办法：就是要加 use_frameworks!
target 'xiangmukuangjia' do
pod 'Kingfisher','~> 4.2.0'
use_frameworks!
end
注：不喜勿喷！！！
