Reusable UICollectionViewCell doesn't refreshing

Question

My UICollectionViewCell has a button in storyboard and setting the background image of number of buttons dynamically from document directory creating issues like some buttons background image doesn't refreshing, they hold old image even when i dismiss the controller and load again that controller, the issue still exist. How can solve this issue ?

In My CollectionViewController :

- (NSString *)getBackgroundImage:(NSIndexPath *)indexPath {

    NSArray *indexes = [self.allColors[indexPath.section] objectForKey:@"indexes"];

    return [NSString stringWithFormat:@"%@/%@/%@/combimeter_button/combimeter_%ld_%@@2x.png", [self.documentDirectory getDocumentsDirectory], _selectedCar, _selectedCar, (long)[indexes[indexPath.row] integerValue], [self getColorKey:indexPath.section]];
}


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    CustomCollectionViewCell *cell = (CustomCollectionViewCell *) [collectionView dequeueReusableCellWithReuseIdentifier:@"CustomCell" forIndexPath:indexPath];

    cell.layer.borderWidth = 2.0f;
    cell.layer.borderColor = [[self getBackgroundColor:indexPath.section] CGColor];
    [cell.cellButton setBackgroundImage:[UIImage imageNamed:[self getBackgroundImage:indexPath]] forState:UIControlStateNormal];
    [cell.cellButton addTarget:self action:@selector(combimeterButtonDidSelected:) forControlEvents:UIControlEventTouchUpInside];

    return cell;
}

In my custom collectionView Cell :

@interface CustomCollectionViewCell : UICollectionViewCell

@property (weak, nonatomic) IBOutlet UIButton *cellButton;

@end

@implementation CustomCollectionViewCell

-(void)prepareForReuse {
    NSLog(@"Is it possible to clear here ? but this method didn't call in my code");
}

@end

wt is your data source for section and rows ? – kaushal Jan 11 '17 at 09:08 — kaushal, Jan 11 '17 at 09:08
I'm getting data from plist file – Nuibb Jan 11 '17 at 09:32 — Nuibb, Jan 11 '17 at 09:32

score 2 · Accepted Answer · answered Jan 11 '17 at 08:47

2

Maybe the problem is that imageNamed: caches the image. Try using imageWithContentsOfFile: instead.

answered Jan 11 '17 at 08:47

junk_key

36
5

Thanks junk_key, you saved my life...:) – Nuibb Jan 11 '17 at 09:36

score 0 · Answer 2 · answered Jan 11 '17 at 06:37

0

Try removing all previous views before creating a new view:

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    CustomCollectionViewCell *cell = (CustomCollectionViewCell *) [collectionView dequeueReusableCellWithReuseIdentifier:@"CustomCell" forIndexPath:indexPath];

    for (UIView *subview in [cell subviews]) {
        [subview removeFromSuperview];
    }

    ...
}

answered Jan 11 '17 at 06:37

emotality

12,795
4
39
60

No, this is not working, in this case, all the buttons are blank, no background image is showing. – Nuibb Jan 11 '17 at 06:47

Reusable UICollectionViewCell doesn't refreshing

2 Answers2