完成基本设置后添加自己的iOS设备进行连接基本工作，本人使用xcode 7.2.1工具
如果调试时出现codesign failed with exit code 1
我是直接重启手机，就解决了这个问题，网上分为三步1.断开重新连接设备2重启xcode3重启手机重新连接，其实我这也是实践过来的这几个步骤。
点击选择就可链接，No valid signing identities (i.e. certificate and private key pair) matching the team ID “MK6J63FSN3” were found.
Xcode can attempt to fix this issue. This will reset your code signing and provisioning settings to recommended values and resolve issues with signing identities and provisioning profiles.
点击后显示链接第一个错误是添加账号的错误，需要苹果ID第二次验证，原以为是需要开发者账号。