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