The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 7.0, but the range ...

解決方案：

將下述內容添加在PodFile的最下方，重新執行Pod install。

post_install do |installer|
    installer.pods_project.targets.each do |target|
        target.build_configurations.each do |config|
            config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '8.0'
        end
    end
end

注意：修改版本號與你的 platform :ios, '8.0' 一致。