How to select an UIImgeView from NSArray

Question

I have UIImageViews which are used as drag-able objects and they are in NSArray so and they work fine when drag them but what i want is when i drag them and finish dragging method instead of drop the image in the UIImageView i want replace it with custom image only in the dragged finish. so my problem is if i remove the NSArray and make it only IF statement it work fine but only take one image and if i make it in NSArray as the code below it is take only last image (Close2) and not appended it

UIImage+Stuff.h

    #import <UIKit/UIKit.h>

    @interface UIImage (Stuff)

    //
    // return an UIImage from a CALayer
    //
    + ( UIImage* ) grabImage:(CALayer*)layer;

    @end

UIImage+Stuff.m

    #import "UIImage+Stuff.h"

    @implementation UIImage (Stuff)

    + ( UIImage* ) grabImage:(CALayer*)layer
    {
    UIGraphicsBeginImageContext ( layer.frame.size );
    [ layer renderInContext:UIGraphicsGetCurrentContext() ];

        UIImage *grab = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        return grab;
    }
    @end

MainGameVC.h

    @class APChartObject;

    //
    // drag status
    //
    typedef enum {
    tDragStatusBegin = 0,
    tDragStatusEnd,
    tDragStatusIntersectIn,
    tDragStatusIntersectOut
    } tDragStatus;

    @interface MainGameVC : UIViewController

    @property (nonatomic, strong) IBOutletCollection(UIImageView) NSArray *TopMenuImages;
    //top menu scroll views
    @property (nonatomic, retain) IBOutlet UIScrollView *TopMenuViewer;
    @property (nonatomic, retain) IBOutlet UIScrollView *scrollview;

    //drag and drop
    @property (nonatomic, strong) IBOutlet UIView *DropView;
    @property (nonatomic, strong) UIImageView *dragObject;
    @property (nonatomic, strong) IBOutlet UIScrollView *cart;
    @property (nonatomic, assign) tDragStatus dragging;
    @property (nonatomic, strong) APChartObject *selectedModel;

    // all tools
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectBox;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectSand;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectSoil;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectWater;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectWheat;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectCorn;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectGarlic;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectLettuse;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectOnion;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectSugercane;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectTomato;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectCucumber;
    @property (weak, nonatomic) IBOutlet UIImageView *DragedObjectBeans;
    @end

MainGameVC.m

    #import "UIImage+Stuff.h"
@interface MainGameVC ()
{
    UIImageView *_selectedView;
    CGPoint _startPoint;
    int selectedViewTag;
}

@end

- (void)viewDidLoad
{
    // drag and drop touch
    UIPanGestureRecognizer *DragAndDrop = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
    [self.TopMenuViewer addGestureRecognizer:DragAndDrop];

    NSArray *imageViewArray = [NSArray arrayWithObjects:DragedObjectWheat,DragedObjectCorn,DragedObjectOnion, nil];

    for(UIImageView *image in imageViewArray)
    {
        UIPanGestureRecognizer *DragAndDrop2 = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:) ];
        [DragAndDrop2 setMinimumNumberOfTouches:1];

        [image addGestureRecognizer:DragAndDrop2];
        image.userInteractionEnabled = YES;

    }

}

//+---------------------------------------------------------------------------+
#pragma mark - View exchange
// +---------------------------------------------------------------------------+


    //
    // make the tricks.
    // Add a subview with the screenshot of selected and move around the screen
    //
    - ( void) cloneViewWithCenter:(CGPoint)point image:(UIImage*)grab ImageTag:(int)ToolTag
    {
    if ( _selectedView ) [ _selectedView removeFromSuperview ];
    selectedViewTag = ToolTag;
    _selectedView = [[ UIImageView alloc ] initWithImage:grab ];
    _selectedView.frame = CGRectMake(point.x, point.y, grab.size.width,   grab.size.height);
    _selectedView.userInteractionEnabled = YES;

    [ self.view addSubview:_selectedView ];

    UIPanGestureRecognizer *pan = [[ UIPanGestureRecognizer alloc ] initWithTarget:self  action:@selector(moveObject:) ];
    [ pan setMinimumNumberOfTouches:1 ];
    [ _selectedView addGestureRecognizer:pan ];
    }


    // +---------------------------------------------------------------------------+
    #pragma mark - Refresh
    // +---------------------------------------------------------------------------+


    //
    // refresh loop
    //
    - (void) refreshView
    {
    [UIView animateWithDuration:0.2 animations:^
     {
         CGRect r = _selectedView.frame;

         switch ( _dragging ) {
             case tDragStatusBegin:
                 r.size.width  *= 1;
                 r.size.height *= 1;
                 break;
             case tDragStatusEnd:
                 r.size.width  /= 1;
                 r.size.height /= 1;
                 break;
             case tDragStatusIntersectIn:
                 r.size.width  = 1;
                 r.size.height = 1;

                 [ self finishDrag ];
                 break;
             case tDragStatusIntersectOut:
                 _selectedView.center = _startPoint;
                 break;
         }

         _selectedView.frame = r;

     } completion:^(BOOL finished)
     {

         if ( _dragging == tDragStatusIntersectOut )
             _selectedView.hidden = YES;

     }];
    }

    //
    // end drag
    //
    - (void) finishDrag
    {
    UIImageView *Tool;

    UIImage *ReplacedPhoto;
    UIImageView *imageView;
    switch (selectedViewTag)
    {

        case 1:

        {
            logic for image tag 1
                break;
        }
        case 2:

        {
            logic for image tag 2
                break;
        }

            Tool.userInteractionEnabled = YES;
            [self appendView:Tool];
    }

    //
    // check for insertion in cart (or not)
    //
    - (void) checkForIntersection
    {
        //
        // ABS coords.
        //
        CGRect childRect = [ self.view convertRect:_selectedView.frame fromView:nil ];
        CGRect cartRect  = [ self.view convertRect:_cart.frame fromView:nil ];

        if ( CGRectIntersectsRect ( childRect, cartRect ))
        {
            self.dragging = tDragStatusIntersectIn;

        }
        else
        {
            self.dragging = tDragStatusIntersectOut;
        }
    }

    - (void) refreshCart
    {
        [ _cart setContentOffset:CGPointMake(_cart.contentOffset.x, 0) animated:YES ];
    }


    // +---------------------------------------------------------------------------+
    #pragma mark - Pan gesture
    // +---------------------------------------------------------------------------+

    - ( void ) panDetected:(UIPanGestureRecognizer*)gesture
    {

        CGPoint pInView = [ gesture locationInView:self.view ];
        //CGSize  pSize   = gesture.view.frame.size;

        if ( gesture.state == UIGestureRecognizerStateBegan )
        {
            _startPoint = pInView;
            UIImage *grab = [UIImage grabImage: gesture.view.layer];
            ToolTag = gesture.view.tag ;
            for (int i = 0; i>ToolTag; i++)
            {
                i = i+1;
                ToolTag = i;
            }
            //
            // centering view
            //
            //pInView.x = pInView.x - pSize.width/2;
            //pInView.y = pInView.y - pSize.height/2;

            [ self cloneViewWithCenter:pInView image:grab ImageTag:ToolTag ];

            self.dragging = tDragStatusBegin;
        }
        else if ( gesture.state == UIGestureRecognizerStateChanged )
        {
            [ self moveObject:gesture ];
        }
        else if ( gesture.state == UIGestureRecognizerStateEnded )
        {
            self.dragging = tDragStatusEnd;
            [ self checkForIntersection ];
        }
    }

    //
    // move draggable view around
    //
    - (void) moveObject:(UIPanGestureRecognizer *)pan
    {
        _selectedView.center = [ pan locationInView:_selectedView.superview ];
    }


// +---------------------------------------------------------------------------+
#pragma mark - Setter
// +---------------------------------------------------------------------------+


    - (void)setDragging:(tDragStatus)dragging
    {
        _dragging = dragging;
        [ self refreshView ];
    }


    // +---------------------------------------------------------------------------+
#pragma mark - Chart view
    // +---------------------------------------------------------------------------+


    //
    // recursively append view to scrollview.
    // If position already contains a view, shift and retry.
    //
    - (void) appendView:(id)view
    {

        [ _cart addSubview:view ];

        [ self performSelector:@selector(refreshCart) withObject:nil afterDelay:0 ];
    }
    @end

Answer 1

In your header file declare a property to hold your imageview's and then hook them up in interface builder.

@interface YourViewController : UIViewController

@property (nonatomic, strong) IBOutletCollection(UIImageView) NSArray *imageViews;
//...

@end

Now in the interface builder you need to connect all the imageView's to this new property.

Now you need to work with the imageViews collection. You can manually even tag the image which can be later used to check which image is dragged.

for (UIImageView *imageView in self.imageViews) {
  if (imageView.tag == 1){ 
  // .. Logic for image with tag 1
  }
  elseif (imageView.tag == 2){ 
  // .. Logic for image with tag 2
  }
}