Las celdas reutilizadas en un UICollectionView muestran múltiples UIImageViews cuando solo deberían mostrar una

El problema es que sigues agregando vistas a UICollectionViewCell ya que están siendo reutilizadas automáticamente por UICollectionView. Así que los viejos UIImageView's todavía están en la celda como usted está agregando uno más como el cellForItemAtIndexPath: se llama.

NO USE addSubview:!

En su lugar, podría crear una celda personalizada con todas las vistas que desee ya en ellas. De modo que cuando se llama a cellForItemAtIndexPath: solo necesita establecer el contenido de este CustomCollectionViewCell en su lugar.

De esta manera, sin duda dejará de ser dañado.

Cómo construir una célula personalizada.

Step1 : Crear el .h&.clase m.

CustomCell.h

#import <UIKit/UIKit.h>

@interface CustomCell : UICollectionViewCell
{
    UIImageView *imageView;
}

@property (nonatomic, retain) UIImageView *imageView; //this imageview is the only thing we need right now.

@end

CustomCell.m

#import "CustomCell.h"

@implementation CustomCell

@synthesize imageView;

- (id)initWithFrame:(CGRect)aRect
{
    if (self = [super initWithFrame:aRect])
    {
         //we create the UIImageView in this overwritten init so that we always have it at hand.
         imageView = [UIImageView alloc] init];
         //set specs and special wants for the imageView here.
         [self addSubview:imageView]; //the only place we want to do this addSubview: is here!

         //You wanted the imageView to react to touches and gestures. We can do that here too.
         UITapGestureRecognizer * tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onButtonTapped:)];
        [tap setNumberOfTapsRequired:1];
        [self addGestureRecognizer:tap];


        //We can also prepare views with additional contents here!
        //just add more labels/views/whatever you want.
    }
    return self;
}

-(void)onButtonTapped:(id)sender
{
    //the response to the gesture.
    //mind that this is done in the cell. If you don't want things to happen from this cell.
    //then you can still activate this the way you did in your question.

}

Step2 : ¡Impórtalo! Ahora que hemos creado el CustomCell podemos importarlo en la clase en la que queremos usarlo.

Step3: ¡Úsalo en acción!

// creates the individual cells to go in the menu view
- (CustomCell*) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    // create collection view cell
    CustomCell *cell = (CustomCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"CustomCell" forIndexPath:indexPath]; //this is the place where the CustomCell does his magic.
    //Make sure to use the CustomCellReuseId that you register in the viewdidload/loadview (step4)

    // add a button image
    NSString * buttonPath=[[NSBundle mainBundle] pathForResource:@"button" ofType:@"png" inDirectory:[[buttons objectAtIndex:indexPath.row] objectForKey:@"name"]];

    cell.imageView.image = [UIImage imageWithContentsOfFile:buttonPath]; //place the image on the CustemCell.imageView as we prepared.

    // set tag to the indexPath.row so we can access it later
    [cell setTag:indexPath.row]; //we don't need this to access the cell but I left this in for your personal want.

/*
 * we can now do this from the CustomCell as well!
 *
    // add interactivity
    UITapGestureRecognizer * tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onButtonTapped:)];
    [tap setNumberOfTapsRequired:1];
    [cell addGestureRecognizer:tap];
*/
    // return the cell
    return cell;

}

Step4 : Registre la celda en collectionView

En viewDidLoad / loadView agregue esto línea:

[_collectionView registerClass:[CustomCell class] forCellWithReuseIdentifier:@"CustomCell"];

Step5 : ¡Disfruta! Tu CustomCell está hecho. Ahora haz lo que quieras y no olvides tomar un poco de café también.