Getting Image index - iphone

Question

I am developing an app in that i have 15 images for stored in an array as front images and another 15 images as back image. I want to add that image to scrollview vertically i have done that successfully but now my problem is that how can I compare that two array images.
Adding front images on vertical scrollview added succesfully but not randomly shuffled, ie when I double tap on the front image the back array image is displayed but still front image present in that imageview.
Please help me out to solve this problem.
Thanks in advance.
Please check my code :
- (void)viewDidLoad
{
[super viewDidLoad];
AppDelegate * delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];
delegate.front=TRUE;
delegate.back=FALSE;
UIScrollView *scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
[scrollView setPagingEnabled:YES];
[scrollView setShowsHorizontalScrollIndicator:NO];
FrontsCards=[[NSMutableArray alloc]initWithObjects:#"cloub1.png",#"cloub2.png",#"cloub3.png",#"cloub4.png",#"cloub5.png",#"cloub6.png",#"cloub7.png",#"cloub8.png",#"cloub9.png",#"cloub10.png",#"cloub11.png",#"cloub12.png",#"diamond1.png",#"diamond2.png",#"diamond3.png",#"diamond4.png",#"diamond5.png", nil];
for(int m=0; m<[FrontsCards count];m++)
{
ImgView.tag=m;
int randIdx=arc4random()%[FrontsCards count];
NSString *imageName=[FrontsCards objectAtIndex:randIdx];
// NSLog(#"%d",randIdx);
NSString *fullImageName=[NSString stringWithFormat:#"%#",imageName];
int padding=25;
// padding is given.
CGRect imageViewFrame=CGRectMake(scrollView.frame.size.width*m+padding, scrollView.frame.origin.y, scrollView.frame.size.width-2*padding, scrollView.frame.size.height);
ImgView=[[UIImageView alloc]initWithFrame:imageViewFrame];
[ImgView setImage:[UIImage imageNamed:fullImageName]];
[ImgView setContentMode:UIViewContentModeScaleAspectFill];
[scrollView addSubview:ImgView];
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(doubleTapImgView:)];
doubleTap.numberOfTapsRequired = 2;
doubleTap.delegate = self;
[self.ImgView addGestureRecognizer:doubleTap];
self.ImgView.userInteractionEnabled=YES;
}
CGSize scrollViewSize=CGSizeMake(scrollView.frame.size.width*[FrontsCards count], scrollView.frame.size.height);
[scrollView setContentSize:scrollViewSize];
[self.view addSubview:scrollView];
}
- (void)doubleTapImgView:(UITapGestureRecognizer *)gesture
{
AppDelegate * delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];
delegate.back=TRUE;
delegate.front=FALSE;
NSLog(#"%d", gesture.view.tag);
NSLog(#"double-tap");
BackCards =[[NSMutableArray alloc]initWithObjects:#"card1.jpg",#"card2.jpg",#"card3.jpg",#"card4.jpg", nil];
UIScrollView *scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
[scrollView setPagingEnabled:YES];
[scrollView setShowsHorizontalScrollIndicator:NO];
for(int m=0; m< [BackCards count];m++)
{
NSString *imageName=[BackCards objectAtIndex:m];
NSString *fullImageName=[NSString stringWithFormat:#"%#",imageName];
int padding=25;
// padding is given.
CGRect imageViewFrame=CGRectMake(scrollView.frame.size.width*m+padding, scrollView.frame.origin.y, scrollView.frame.size.width-2*padding, scrollView.frame.size.height);
ImgView=[[UIImageView alloc]initWithFrame:imageViewFrame];
[ImgView setImage:[UIImage imageNamed:fullImageName]];
[ImgView setContentMode:UIViewContentModeScaleAspectFill];
[scrollView addSubview:ImgView];
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(doubleTapImgView:)];
doubleTap.numberOfTapsRequired = 2;
doubleTap.delegate = self;
[self.ImgView addGestureRecognizer:doubleTap];
self.ImgView.userInteractionEnabled=YES;
}
CGSize scrollViewSize=CGSizeMake(scrollView.frame.size.width*[FrontsCards count], scrollView.frame.size.height);
[scrollView setContentSize:scrollViewSize];
[self.view addSubview:scrollView];
}

Answer 1

For achieving this one you can set Tag value for every image when you tap on that particuler image you'l get tag value and use that tag value.
self.imagview.tag=Unique_tagValue;
when click on that image you can set image from another Array.
self.imageview.image=[UIImage imageNamed:[backArray objectAtIndex:self.imageview.tag]];
EDIT:-
in viewDidLoad method set tags for imageview like this, ImgView.tag=m+100;
keep below code in doubleTapImgView method
for(int m=0; m< [BackCards count];m++)
{
UIImageView *imgview=(UIImageView *)[scrollview viewWithTag:m+100];
imgview.image=[UIImage imagNamed:[BackCards objectAtIndex:m]];
}
Subview Translation:-
[self.view bringSubviewToFront:frontview];

Answer 2

Either you can use the same name for the images in backArray and front Array or you can set the tag value of each image uniquely and compares that tags to solve the problem.
imgV.tag=tagValue;
Hope this helps.