iPhone: There is no SDK with the name or path 'iphoneos3.0'

iPhone: There is no SDK with the name or path 'iphoneos3.0'

解决方法：

Tell me about it. Try this in XCode goto 'Project' Menu and select 'Edit Project Settings'. In the General tab, last but one item, select the drop down list 'Base SDK for all Configuration' There you can specify which SDK your project will target.