Delegate method is being called but doesn't execute properly - ios

Question

I'm having a problem with one of my delegate methods. I have a collectionViewController to which I have added a UILongPressGestureRecognizer, which is calling a delegate method fadeOutLabels in my UICollectionViewCell. I can confirm the delegate method being called by a NSLog statement NSLog(#"fadeOutLabels was called");. But the other code inside that function isn't being executed. I'm quite sure I'm missing something completely obvious, but I can't seem to figure it out myself. Code as follows:
FOFPhotoCell.h
#protocol FOFPhotoCellDelegate <NSObject>
#required
-(void)fadeOutLabels;
#end
#interface FOFPhotoCell : UICollectionViewCell {
id delegate;
}
#property (nonatomic, weak) id<FOFPhotoCellDelegate> delegate;
#property (nonatomic) UIImageView *imageView;
#property (nonatomic) NSDictionary *photo;
#property (nonatomic) NSArray *fetchPhotos;
#property (nonatomic) UILabel *titleLabel;
#end
FOFPhotoCell.m
#implementation FOFPhotoCell
#synthesize delegate = _delegate;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
CGFloat widthFromBounds = self.contentView.bounds.size.width;
self.imageView = [[UIImageView alloc] init];
[self.contentView insertSubview:self.imageView atIndex:0];
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 30, widthFromBounds, 60)];
self.titleLabel = titleLabel;
self.titleLabel.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.3];
self.titleLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];
self.titleLabel.textColor = [UIColor whiteColor];
self.titleLabel.textAlignment = NSTextAlignmentCenter;
[self.contentView insertSubview:self.titleLabel atIndex:1];
}
return self;
}
-(void)fadeOutLabels
{
NSLog(#"fadeOutLabels was called");
[UIView animateWithDuration:1.0
delay:0.0 /* do not add a delay because we will use performSelector. */
options:UIViewAnimationOptionCurveEaseIn
animations:^ {
self.titleLabel.alpha = 0.0;
}
completion:^(BOOL finished) {
[self.titleLabel removeFromSuperview];
}];
}
FOFPhotosViewController.h
#import <UIKit/UIKit.h>
#import "FOFPhotoCell.h"
#interface FOFPhotosViewController : UICollectionViewController <FOFPhotoCellDelegate>
#end
FOFPhotosViewController.m
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
FOFPhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"photo" forIndexPath:indexPath];
NSArray *photosArray = [self.dishes valueForKeyPath:#"avatar_url"];
NSArray *nameArray = [self.dishes valueForKeyPath:#"name"];
// NSLog(#"photoURL %#", _responseDictionary);
cell.backgroundColor = [UIColor lightGrayColor];
[cell.imageView setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:#"http://xx.yy.zz.qq:4000%#",[photosArray objectAtIndex: indexPath.row]]]];
cell.titleLabel.text = [NSString stringWithFormat:#"%#", [nameArray objectAtIndex:indexPath.row]];
UILongPressGestureRecognizer *tapAndHold = [[UILongPressGestureRecognizer alloc] initWithTarget:cell action:#selector(fadeOutLabels)];
tapAndHold.minimumPressDuration = 0.5;
[self.collectionView addGestureRecognizer:tapAndHold];
[self.collectionView reloadItemsAtIndexPaths:[NSArray arrayWithObject:indexPath]];
return cell;
}
I would really appreciate if some one could help me with this issue.
Thanks in advance
Chris

Answer 1

I believe your problem comes from the LongPressGestureRecognizer that should be instantiated in your custom cell and not in your view controller.
Basically, if you have a hundred cell how the long press gesture recognizer is supposed to know which cell you have pressed and which label to fade out.
You can try this instead, in your custom cell :
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
UILongPressGestureRecognizer *tapAndHold = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(fadeOutLabels)];
tapAndHold.minimumPressDuration = 0.5;
[self addGestureRecognizer:tapAndHold];
....
}
}
And of course remove those lines in the view controller.