The operation couldn’t be completed. Unable to log in with account … The login details for account … were rejected.

 I had to go to “Preferences” -> “Accounts”, where it turned out my Apple ID had timed-out. After logging-in there, and then restarting Xcode, my profile was automatically “repaired”, and all is now well.

用真机调试时

继续报错：

No profiles for ‘com.XXX.UISwiftDemo’ were found: Xcode couldn’t find any iOS App Development provisioning profiles matching ‘com.xxx.UISwiftDemo’.

项目选择开发者账号

注册设备 Register Device