CloudKit: How to update a record in a Container's Public Database (Objective-C)

ios-cloudkit-objc-updaterecord

    //get the Container for the App
    CKContainer *defaultContainer = [CKContainer defaultContainer];
    
    //get the PublicDatabase inside the Container
    CKDatabase *publicDatabase = [defaultContainer publicCloudDatabase];
    
    //create a record id for the target record we want to fetch and then update
    CKRecordID *wellKnownID = [[CKRecordID alloc] initWithRecordName:@"1"];
    
    //fetch the target record using it's id
    [publicDatabase fetchRecordWithID:wellKnownID completionHandler:^(CKRecord *record, NSError *error) {
        
        //handle fetch error
        if(error) {
            
            NSLog(@"Uh oh, there was an error fetching ... %@", error);
            
        } else {
            
            //update a property
            record[@"address"] = @"123 Beggers Canyon, Tatooine";;
            
            //save the update back to the target database
            [publicDatabase saveRecord:record completionHandler:^(CKRecord *record, NSError *error) {
                
                //handle error
                if(error) {
                    
                    NSLog(@"Uh oh, there was an error updating ... %@", error);
                    
                } else {
                    
                    NSLog(@"Updated record successfully");
                    NSLog(@"Title: %@", record[@"title"]);
                    NSLog(@"Description: %@", record[@"description"]);
                    NSLog(@"Address: %@", record[@"address"]);
                    NSLog(@"Locations: %@", record[@"locations"]);
                }
            }];
        }
    }];