Objective-C

Generate Monotonic ULIDs

See more ULID/UUID Examples

Generate a sequence of monotonic ULIDs all using the same seed time. This code sample generates a series of ULIDs with continuously increasing values.

Important: Chilkat's ULID functionality was introduced in v9.5.0.94.

Objective-C

#import <CkoDateTime.h>
#import <NSString.h>
#import <CkoStringBuilder.h>

CkoDateTime *seedDt = [[CkoDateTime alloc] init];

//  You can set the seed time to any desired value.
//  In this example, the seed time is set to the current system date/time.
[seedDt SetFromCurrentSystemTime];

//  Generate the 1st ULID in the series.
//  (i.e. the current UTC UNIX-time)
BOOL utc = YES;
NSString *ulid = [seedDt UlidGenerate: utc];
NSLog(@"%@",ulid);

//  Store the ULID in a Chilkat StringBuilder to generate the series.
CkoStringBuilder *sbUlid = [[CkoStringBuilder alloc] init];
[sbUlid Append: ulid];

int i = 0;
while (i < 50) {
    [seedDt UlidIncrement: sbUlid];
    NSLog(@"%@",[sbUlid GetAsString]);
    i = i + 1;
}

//  Sample output:

//  01GRGH30H8DMQ4F9A0XCTZHPGM
//  01GRGH30H8DMQ4F9A0XCTZHPGN
//  01GRGH30H8DMQ4F9A0XCTZHPGP
//  01GRGH30H8DMQ4F9A0XCTZHPGQ
//  01GRGH30H8DMQ4F9A0XCTZHPGR
//  01GRGH30H8DMQ4F9A0XCTZHPGS
//  01GRGH30H8DMQ4F9A0XCTZHPGT
//  01GRGH30H8DMQ4F9A0XCTZHPGV
//  01GRGH30H8DMQ4F9A0XCTZHPGW
//  01GRGH30H8DMQ4F9A0XCTZHPGX
//  01GRGH30H8DMQ4F9A0XCTZHPGY
//  01GRGH30H8DMQ4F9A0XCTZHPGZ
//  01GRGH30H8DMQ4F9A0XCTZHPH0
//  01GRGH30H8DMQ4F9A0XCTZHPH1
//  01GRGH30H8DMQ4F9A0XCTZHPH2
//  01GRGH30H8DMQ4F9A0XCTZHPH3
//  01GRGH30H8DMQ4F9A0XCTZHPH4
//  01GRGH30H8DMQ4F9A0XCTZHPH5
//  01GRGH30H8DMQ4F9A0XCTZHPH6
//  01GRGH30H8DMQ4F9A0XCTZHPH7
//  01GRGH30H8DMQ4F9A0XCTZHPH8
//  01GRGH30H8DMQ4F9A0XCTZHPH9
//  01GRGH30H8DMQ4F9A0XCTZHPHA
//  01GRGH30H8DMQ4F9A0XCTZHPHB
//  01GRGH30H8DMQ4F9A0XCTZHPHC
//  01GRGH30H8DMQ4F9A0XCTZHPHD
//  01GRGH30H8DMQ4F9A0XCTZHPHE
//  01GRGH30H8DMQ4F9A0XCTZHPHF
//  01GRGH30H8DMQ4F9A0XCTZHPHG
//  01GRGH30H8DMQ4F9A0XCTZHPHH
//  01GRGH30H8DMQ4F9A0XCTZHPHJ
//  01GRGH30H8DMQ4F9A0XCTZHPHK
//  01GRGH30H8DMQ4F9A0XCTZHPHM
//  01GRGH30H8DMQ4F9A0XCTZHPHN
//  01GRGH30H8DMQ4F9A0XCTZHPHP
//  01GRGH30H8DMQ4F9A0XCTZHPHQ
//  01GRGH30H8DMQ4F9A0XCTZHPHR
//  01GRGH30H8DMQ4F9A0XCTZHPHS
//  01GRGH30H8DMQ4F9A0XCTZHPHT
//  01GRGH30H8DMQ4F9A0XCTZHPHV
//  01GRGH30H8DMQ4F9A0XCTZHPHW
//  01GRGH30H8DMQ4F9A0XCTZHPHX
//  01GRGH30H8DMQ4F9A0XCTZHPHY
//  01GRGH30H8DMQ4F9A0XCTZHPHZ
//  01GRGH30H8DMQ4F9A0XCTZHPJ0
//  01GRGH30H8DMQ4F9A0XCTZHPJ1
//  01GRGH30H8DMQ4F9A0XCTZHPJ2
//  01GRGH30H8DMQ4F9A0XCTZHPJ3
//  01GRGH30H8DMQ4F9A0XCTZHPJ4
//  01GRGH30H8DMQ4F9A0XCTZHPJ5
//  01GRGH30H8DMQ4F9A0XCTZHPJ6