问题：The iOS Simulator deployment target is set to x.x, but the range of supported deployment target versions for this platform is 8.0 to 12.0. (in target 'xxx')
解决办法：
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同样修改pod中的所有targets都重新手动设置一下，支持到的最低版本
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并不是添加下面这个就能解决的
post_install do |installer|
installer.pods_project.targets.each do |target|
target.build_configurations.each do |config|
if config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'].to_f < 8.0
config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '8.0'
end
end
end
end
