自定义UICollectionViewCell不显示更改

Question

I have created class that extends UICollectionViewCell and cell was customised within the storyboard. Within the initWithCoder for the cell I modify the labels shadow.

    - (id)initWithCoder:(NSCoder *)aDecoder {
        self = [super initWithCoder:aDecoder];
        self.artistNameLabel.font = [UIFont fontWithName:@"Montserrat-Regular" size:12];
        self.artistNameLabel.layer.masksToBounds = NO;
        self.artistNameLabel.shadowColor = [UIColor colorWithWhite:0 alpha:0.65];
        self.artistNameLabel.layer.shadowOffset = CGSizeMake(0, 0);
        self.artistNameLabel.layer.shadowOpacity = 1.0;
        self.artistNameLabel.layer.shadowRadius = 2.0;
        return self;
    }

For some reasons the changes do not show up, even though the init is called when creating the cell.

If I move the shadow code into -(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath it shows fine, but obviously this is not very good for reuse.

Answer 1

Move it over to - (void)awakeFromNib . That's a much better place to put it.

Answer 2

Make a single public method on your custom cell called something like updateUI and call that from within your -(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath method. You can alloc init your collection view cell's var's in your - (id)initWithCoder:(NSCoder *)aDecoder method, but to have your shadowRadius, shadowOpacity, etc go into effect I recommend the approach described above.

#pragma mark - Helpers

- (void)updateUI // Update data within alreay alloc inited UI elements
{
    self.backgroundColor = [UIColor redColor];
    self.myImageView.frame = self.contentView.frame;
    self.myImageView.contentMode = UIViewContentModeScaleAspectFit;
}

- (void)setup // Alloc init UI elements
{
    self.myImageView = [[UIImageView alloc] init];
    [self.contentView addSubview:self.myImageView];
}

#pragma mark - Lifecycle Methods

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self) {
        // Initialization code
        [self setup];
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self setup];
    }
    return self;
}

Answer 3

For answer on your i need little bit more information but check next

1) Are you using your custom UICollectionViewCell

2) In method

   - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView   cellForItemAtIndexPath:(NSIndexPath *)indexPath {
   DomyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"DomyCell" forIndexPath:indexPath];