{"id":3,"date":"2008-02-24T22:28:08","date_gmt":"2008-02-24T22:28:08","guid":{"rendered":"http:\/\/vgable.com\/blog\/2008\/02\/24\/creating-a-uuid-guid-in-cocoa\/"},"modified":"2008-11-24T21:42:38","modified_gmt":"2008-11-25T02:42:38","slug":"creating-a-uuid-guid-in-cocoa","status":"publish","type":"post","link":"https:\/\/vgable.com\/blog\/2008\/02\/24\/creating-a-uuid-guid-in-cocoa\/","title":{"rendered":"UUID (GUID) Support in Cocoa"},"content":{"rendered":"

To easily create a new UUID<\/a> (aka GUID<\/a>) in Cocoa, add the following method as a category to NSString:<\/p>\n

+ (NSString*) stringWithUUID {
\n   CFUUIDRef\tuuidObj = CFUUIDCreate(nil);\/\/create a new UUID
\n   \/\/get the string representation of the UUID
\n   NSString\t*uuidString = (NSString*)CFUUIDCreateString(nil, uuidObj);
\n   CFRelease(uuidObj);
\n   return [uuidString autorelease];
\n}<\/code><\/p>\n

That’s it, just 4 lines of code.\u00a0There’s really no need to deal with an entire UUID class<\/i>. All you ever need to do with UUIDs is create them, compare them, and store\/retrieve them. + stringWithUUID<\/code> handles creation. The string it returns responds to - isEqual:<\/code>, and is easy to write or read using the mature Foundation APIs. What more could you ask for from a UUID object?<\/p>\n

Simpler Ways:<\/h3>\n

You might only need: [[NSProcessInfo processInfo] globallyUniqueString]<\/code>. As the name implies, it gives you a UUID that can be used to identify a process.<\/p>\n

\nIf you want a UUID without messing with compiled code, the uuidgen<\/code><\/a> command-line tool generates them, or you can use this website<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

To easily create a new UUID (aka GUID) in Cocoa, add the following method as a category to NSString: + (NSString*) stringWithUUID {    CFUUIDRef uuidObj = CFUUIDCreate(nil);\/\/create a new UUID    \/\/get the string representation of the UUID    NSString *uuidString = (NSString*)CFUUIDCreateString(nil, uuidObj);    CFRelease(uuidObj);    return [uuidString autorelease]; } That’s it, just 4 lines of code.\u00a0There’s really […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,5,4,9],"tags":[234,233,232],"class_list":["post-3","post","type-post","status-publish","format-standard","hentry","category-cocoa","category-objective-c","category-programming","category-unix","tag-categories","tag-guid","tag-uuid"],"_links":{"self":[{"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/posts\/3","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/comments?post=3"}],"version-history":[{"count":0,"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/posts\/3\/revisions"}],"wp:attachment":[{"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/media?parent=3"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/categories?post=3"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vgable.com\/blog\/wp-json\/wp\/v2\/tags?post=3"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}