Sqids *sqids = [[Sqids alloc] init];
NSString *id_ = [sqids encode:@[@1, @2, @3] error:nil]; // @"86Rf07"
NSArray<NSNumber *> *numbers = [sqids decode:id_]; // @[@1, @2, @3]

SqidsOptions *options = [[SqidsOptions alloc] init];
options.minLength = @10;
Sqids *sqids = [[Sqids alloc] initWithOptions:options];
NSString *id_ = [sqids encode:@[@1, @2, @3] error:nil]; // @"86Rf07xd4z"
NSArray<NSNumber *> *numbers = [sqids decode:id_]; // @[@1, @2, @3]

SqidsOptions *options = [[SqidsOptions alloc] init];
options.alphabet = @"k3G7QAe51FCsPW92uEOyq4Bg6Sp8YzVTmnU0liwDdHXLajZrfxNhobJIRcMvKt";
Sqids *sqids = [[Sqids alloc] initWithOptions:options];
NSString *id_ = [sqids encode:@[@1, @2, @3] error:nil]; // @"XRKUdQ"
NSArray<NSNumber *> *numbers = [sqids decode:id_]; // @[@1, @2, @3]