UIScrollView做循环图片

#import "ViewController.h"
#define IMAGE_COUNT 6
@interface ViewController ()
{
    UIImageView *myImageView;
    int currentIndex;

}
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    myImageView=[[UIImageView alloc]init];
    myImageView.frame=[UIScreen mainScreen].applicationFrame;
    myImageView.contentMode=UIViewContentModeScaleAspectFit;
    myImageView.image=[UIImage imageNamed:@""];
    [self.view addSubview:myImageView];

    UISwipeGestureRecognizer *leftGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(leftSwipe:)];
    leftGesture.direction=UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:leftGesture];

    UISwipeGestureRecognizer *rightGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(rightSwipe:)];
    leftGesture.direction=UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:rightGesture];

}

-(void)leftSwipe:(UISwipeGestureRecognizer *)gesture
{
    [self transitionAnimation:YES];

}
-(void)rightSwipe:(UISwipeGestureRecognizer *)gesture
{
    [self transitionAnimation:NO];

}
-(void)transitionAnimation:(BOOL)isNext
{
    CATransition *transition=[[CATransition alloc]init];
    transition.type=@"cube";
    if (isNext) {
        transition.subtype=kCATransitionFromRight;
    }
    else
    {
        transition.subtype=kCATransitionFromLeft;
    }
    transition.duration=2.0f;
    myImageView.image=[self getImage:isNext];
    [myImageView.layer addAnimation:transition forKey:@"KCTransitionAnimation"];
}
-(UIImage *)getImage:(BOOL)isNext
{
   if(isNext)
   {
       currentIndex=(currentIndex+)%IMAGE_COUNT;
   }
   else
   {
       currentIndex=(currentIndex-+IMAGE_COUNT)%IMAGE_COUNT;
   }
    NSString *imageName=[NSString stringWithFormat:@"%d",currentIndex];
    return [UIImage imageNamed:imageName];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];

}

@end