I am wondering how do I know what name I should give for my CFBundleSignature and CFBundleIdentifier. I believe these are supposed to be unique identifier so do I have to somehow get these names from apple? Say my app is called javaapp and comes from the website javaapp. Should my CFBundleIdentifier be com.javaapp.javaapp? What 4 letters should I use for my CFBundleSignature?
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The Bundle Identifier uniquely identifies your application. If you have registered a domain name, use that. Otherwise, just use com.<your name>.<application name>
The Bundle Signature is analogous to the "Creator Code" found in Classic Mac OS. It exists only for compatibility with Classic Mac OS apps and documents. Modern Mac OS X apps don't need to worry about assigning a Bundle Signature.
Darren
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Can I use four segments? e.g. com.companyname.divisionname.appname – Danyal Aytekin Dec 06 '11 at 18:15
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1You can have any number of segments. For example: com.apple.iWork.Pages – Darren Dec 06 '11 at 20:08
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1You say "If you have registered a domain name, use that" - but do we use the domain name or the inversed notation like net.mydomainNameBeforeDot.unnecessaryExtraPartThatIWouldLoveToOmit? – IceFire Apr 08 '20 at 06:28
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obviously the inverse notation – George Birbilis Jul 26 '22 at 17:25
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Yes, assuming that you own the domain name javaapp.com, com.javaapp.javaapp would be fine as a bundle ID. There are some rules; as I recall, the bundle ID parts can only contain letters, digits, and hyphens.
The bundle signature in new Xcode projects is initialized as ????. Apple used to have a web page where you could register a unique bundle signature (AKA creator code) but I can no longer find it, so I would assume that the concept is obsolete.
JWWalker
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1@MMazzon I can't find that page either, so I assume it's just gone. I've updated my answer accordingly. – JWWalker Dec 06 '21 at 00:13