Xcode 4 更改下载组件的appleId

You can change the Apple Developer ID that Xcode has associated using Mac OS X's Keychain Access app:
Quit Xcode
Open Applications > Utilities > Keychain Access
Locate the Keychain entry named "daw2.apple.com ([your Apple ID])" of kind Internet password
Delete this Keychain entry and retry the download in Xcode by re-entering your credentials, or double click on the entry and update the Account and Password fields
Open Xcode and retry the content downloadChange the Apple ID that Xcode 4 uses to download components