NSObject和NSMutableArray问题

@interface Checkin : NSObject {

    NSString *name;
    NSString *profID;
    NSString *time;
    NSString *lon;
    NSString *lat;
    NSString *country;
    NSString *city;
    NSString *place;
    NSString *photoURL;
    NSMutableArray *taggedID;
    NSMutableArray *taggedName;
}

@property(nonatomic, retain)NSString *name;
@property(nonatomic, retain)NSString *profID;
@property(nonatomic, retain)NSString *time;
@property(nonatomic, retain)NSString *lon;
@property(nonatomic, retain)NSString *lat;
@property(nonatomic, retain)NSString *country;
@property(nonatomic, retain)NSString *city;
@property(nonatomic, retain)NSString *place;
@property(nonatomic, retain)NSString *photoURL;
@property(nonatomic, retain)NSMutableArray *taggedID;
@property(nonatomic, retain)NSMutableArray *taggedName;

@end

 Checkin *checkinsA = [[NSObject alloc] init]; 

 NSDictionary *decodedJson = result;   
 NSArray *users = [decodedJson objectForKey:@\"data\"];

for(NSDictionary *user in users) {
    NSLog(@\"Created item: %@ \\n\", [user objectForKey:@\"created_time\"]);
     checkinsA.time = [NSString stringWithFormat:@\"%@\",[user objectForKey:@\"created_time\"]];
    NSDictionary *fromData = [user objectForKey:@\"from\"];
     NSLog(@\"user id is: %@ \\n\", [fromData objectForKey:@\"id\"]);
      checkinsA.profID = [fromData objectForKey:@\"id\"];

     NSLog(@\"user name is: %@\\n \", [fromData objectForKey:@\"name\"]);
      checkinsA.name =[fromData objectForKey:@\"name\"];

    NSDictionary *placeData = [user objectForKey:@\"place\"];
    NSDictionary *locationData = [placeData objectForKey:@\"location\"];
     NSLog(@\"City: %@ \\n\", [locationData objectForKey:@\"city\"]);
      checkinsA.city = [locationData objectForKey:@\"city\"];

     NSLog(@\"Country: %@ \\n\", [locationData objectForKey:@\"country\"]);
      checkinsA.country = [locationData objectForKey:@\"country\"];

     NSLog(@\"Latitude: %@ \\n\", [locationData objectForKey:@\"latitude\"]);
     checkinsA.lat = [locationData objectForKey:@\"latitude\"];

     NSLog(@\"Longitude: %@ \\n\", [locationData objectForKey:@\"longitude\"]);
     checkinsA.lon = [locationData objectForKey:@\"longitude\"];

     NSLog(@\"Place name: %@ \\n\", [placeData objectForKey:@\"name\"]);
     checkinsA.place = [placeData objectForKey:@\"name\"];

    NSDictionary *tagData = [user objectForKey:@\"tags\"];
    NSArray *tagDataArray = [tagData objectForKey:@\"data\"];
    for(NSDictionary *tagData2 in tagDataArray){
      NSLog(@\"tagged user id is: %@ \\n\", [tagData2 objectForKey:@\"id\"]);
        [checkinsA.taggedID addObject:[tagData2 objectForKey:@\"id\"]];
      NSLog(@\"tagged user name is: %@\\n \", [tagData2 objectForKey:@\"name\"]);
         [checkinsA.taggedName addObject:[tagData2 objectForKey:@\"name\"]];
    }

    [checkinArray addObject:checkinsA];
}