核心數據 - NSFetchRequest問題

Question

我有我的NSFetchRequest一個問題，它似乎並沒有被獲取任何數據，下面的代碼：

-(void)addAnnotations 
{  
    NSFetchRequest *request = [[NSFetchRequest alloc] init]; 

    NSEntityDescription *entity = [NSEntityDescription entityForName:@"WayPoint" inManagedObjectContext:managedObjectContext]; 
    [request setEntity:entity]; 

    //NSPredicate *predicate = [NSPredicate predicateWithFormat:@"waypoint_map_id=%i", 98]; 
    //[request setPredicate:predicate]; 

    NSError *error; 
    listArray = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy]; 
    [request release]; 

    NSLog(@"Array: ", listArray); 
} 

Answer 1

問題解決了：

NSLog(@"Array: %d", listArray);