xcode 8--- App Installation failed, No code signature found.

莫名其妙出现这个问题，推测是安装了Xcode iOSopendev模版导致，

打开terminal 执行sudo chmod -R 777 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk

这是为了获得修改文件夹权限

进入 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/SDKSettings.plist

修改CODE_SIGNING_REQUIRED字段为YES

重启xcode