App Installation failed, No code signature found.

1,打开终端执行

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

2,然后打开文件夹

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

修改CODE_SIGNING_REQUIRED字段为YES

重新启动Xcode 就可以真机测试了!!!!

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