At least on MacOSX 10.5.x you might use the command line tool “uuidgen” to get your string e.g. $ uuidgen 054209C4-3873-4679-8104-3C18AE780512 there’s also an option -hdr with this comand that conveniently generates it in header style See man-page for further infos.
In a technical sense, yes, it is faster, for exactly that reason. In a practical sense, no, it’s not faster. For one thing, the speed difference is tiny. We’re talking milliseconds saved over the life of the entire process. The savings might be bigger on the iPhone, but it’s still pretty much the tiniest speed … Read more
For those using Swift 2, you should use: CGFloat.max For those using Swift 3, you should use: CGFloat.greatestFiniteMagnitude Note that CGFloat.max was removed when Swift 3 came out, as reflected in the documentation.
Core Foundation is the C-level API, which provides CFString, CFDictionary and the like. Foundation is Objective-C, which provides NSString, NSDictionary, etc.
NSURL does have this method: – (BOOL)checkResourceIsReachableAndReturnError:(NSError **)error Which “Returns whether the resource pointed to by a file URL can be reached.” NSURL *theURL = [NSURL fileURLWithPath:@”/Users/elisevanlooij/nonexistingfile.php” isDirectory:NO]; NSError *err; if ([theURL checkResourceIsReachableAndReturnError:&err] == NO) [[NSAlert alertWithError:err] runModal];
If you use performSelectorInBackground:withObject: to spawn a new thread, then the performed selector is responsible for setting up the new thread’s autorelease pool, run loop and other configuration details – see “Using NSObject to Spawn a Thread” in Apple’s Threading Programming Guide. You’d probably be better off using Grand Central Dispatch, though: dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ … Read more
Try this one: let uuid = NSUUID().uuidString print(uuid) Swift 3/4/5 let uuid = UUID().uuidString print(uuid)