1.iOS app引入Containers.framework

说明：1.本app支持的最低系统是iOS 8.0，
2.引入科大讯飞SDK，该SDK中引入了Containers.frameworks，并且为Required,因该框架是在9.0后才有的，所以在8.4的系统上会闪退，
解决办法：Required 改为Optional

报错日志：
dyld: Library not loaded: /System/Library/Frameworks/Contacts.framework/Contacts
Referenced from: /private/var/mobile/Containers/Bundle/Application/910E21D6-5CA0-495C-8577-C8AF8FC66313/appName.app/appName
Reason: image not found

解决方法：
solution：setting the added frameworks as Optional instead of Required from here, Project-> Targets-> Build Phases-> Link Binary with Libraries, change the status of added (or which creating the problem) frameworks to Optional

参考：
http://stackoverflow.com/questions/1462964/dyld-library-not-loaded-avfoundation-framework-reason-image-not-found