NSMutableArray从另一个类加载到pickerview

Question

我正在尝试将其他类的数据放入选择器视图....但我对它有点问题....我如何使它正确进入选择器视图....

Fooditem.h

@interface Fooditems : NSObject
@property (nonatomic,assign) int group_id; 
@property (nonatomic, assign)int _id; 
@property (nonatomic,retain) NSString *name; 
@property (nonatomic,assign) int prot_energy; 
@property (nonatomic,assign) int fat_energy;
@property (nonatomic,assign) int carb_energy;
@property (nonatomic,assign) int energy;
@property (nonatomic,assign) int weight;

@property (nonatomic,assign) NSString *wname;

@end

这是DatabaseAccess.m文件的getWeight函数

-(NSMutableArray *) getWeight:(int)_id
{
    //NSLog(@"inside getweight with _id = %@",_id );
    NSMutableArray *fooditemsArray = [[NSMutableArray alloc] init];
    NSLog(@"after alloc init fooditemsarray");
    FMDatabase *db = [FMDatabase databaseWithPath:[Utility getDatabasePath]];
    NSLog(@"after get db path");

    [db open];

   NSLog(@"SELECT name, weight FROM weight where prod_id=%d",_id );

    NSString *prod_id_string = [NSString stringWithFormat:@"%d", _id];
    NSString *query = [ @"SELECT name, weight from weight where prod_id= \"" stringByAppendingString:prod_id_string]; 
    NSString *completequery = [query stringByAppendingString:@"\""];
    NSLog(@"completequery is:");
    NSLog(@"%@",completequery);

    do 
    {
        //NSLog(@"inside while loop");
        Fooditems *fooditem = [[Fooditems alloc] init];
        NSLog(@"getProductDetail: after alloc for fooditem"); 
        fooditem.wname = [results stringForColumn:@"name"];
        fooditem.weight = [results intForColumn:@"weight"];


         NSLog(@"wname = %@",[results stringForColumn:@"name"]);
         NSLog([results stringForColumn:@"name"]);

        [fooditemsArray addObject:fooditem];

    }while([results next]); 


    [db close];

    NSLog(@"fooditemsArray count after db close is %d", [fooditemsArray count]);
    return fooditemsArray;    
}

然后是我的pickerview.m文件

- (void)viewDidLoad
{
    NSLog(@"prod_id in weightView is %d",prod_id);
    [self populateFoodItems];
    NSArray *quan=[[NSArray alloc] initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6", nil];
    self.quantity=quan;

    Fooditems *fooditemtype = [self.fooditemsArray objectAtIndex:[self.fooditemsArray count]];
    NSMutableArray *unit = [[NSMutableArray alloc]initWithObjects:@"%@",fooditemtype.wname,nil];
    self.weights = unit;

    [super viewDidLoad];

}