Cocoa Pods 在pod install 的时候出现CocoaPods could not find compatible versions for pod "Alamofire"报错

我在pod install时，报错信息如下：

[!] CocoaPods could not find compatible versions for pod "Alamofire":
  In Podfile:
    Alamofire (~> 5.2.0)

Specs satisfying the `Alamofire (~> 5.2.0)` dependency were found, but they required a higher minimum deployment target.

解决方法：

source 'https://github.com/CocoaPods/Specs.git'

platform:ios,'10.0'

use_frameworks!

target 'xiaohaoEnglish' do

pod 'Alamofire', '~> 5.2.0'

end

把platform:ios, '9.0'换成platform:ios, '10.0'就好了，主要原因是'Alamofire', '~> 5.2.0'支持的最低版本是ios 10