(iOS) ปัญหาเรื่องการกำหนดขนาด Content size ของ UIScrollView

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {
    UIScrollView *scroll;
}

@property (retain,nonatomic) IBOutlet UIScrollView *scroll;

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize scroll;

- (void)viewDidLoad
{
    [scroll setScrollEnabled:YES];
    [scroll setContentSize:CGSizeMake(320, 1000)];
    
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end