I am creating NSMutableAttributedString
in the cellForItemAtIndexPath
method of my collection view. I am using NSTextAttachment
to embed images in the text.
Is this a bad idea? Currently the scroll performance seems good but I am not sure if there is a better way? Would caching all the NSMutableAttributedString
in a NSMutableDictionary
be better for the second scroll over?
Same question can be applied to a UITableview
too using cellForRowAtIndexPath
.
Code:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
CellView *cell = [collectionView dequeueReusableCellWithReuseIdentifier:[CellView reuseIdentifier] forIndexPath:indexPath];
NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
attachment.image = [UIImage imageNamed:@"eye"];
attachment.bounds = CGRectMake(0, -2.5, 14,14);
NSAttributedString *attachmentString = [NSAttributedString attributedStringWithAttachment:attachment];
NSMutableAttributedString *myString= [[NSMutableAttributedString alloc] initWithString:@""];
[myString appendAttributedString:attachmentString];
[myString appendAttributedString:[[NSMutableAttributedString alloc] initWithString:@" 19K "]];
NSTextAttachment *attachment2 = [[NSTextAttachment alloc] init];
attachment2.image = [UIImage imageNamed:@"heart"];
attachment2.bounds = CGRectMake(0, -2.5, 14,14);
NSAttributedString *attachmentString2 = [NSAttributedString attributedStringWithAttachment:attachment2];
[myString appendAttributedString:attachmentString2];
[myString appendAttributedString:[[NSMutableAttributedString alloc] initWithString:@" 13K "]];
[myString enumerateAttribute:NSFontAttributeName inRange:(NSRange){0,[myString length]} options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired usingBlock:^(id value, NSRange range, BOOL *stop) {
[myString addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"AvenirNext-Medium" size:12] range:range];
[myString addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithWhite:1 alpha:1] range:range];
}];
NSMutableAttributedString *titletext= [[NSMutableAttributedString alloc] initWithString:[self checkIfBig:indexPath]?[NSString stringWithFormat:@"\nThe Underground Railway"]:[NSString stringWithFormat:@"\nPink Oasis"]];
[titletext enumerateAttribute:NSFontAttributeName inRange:(NSRange){0,[titletext length]} options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired usingBlock:^(id value, NSRange range, BOOL *stop) {
[titletext addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"AvenirNext-Medium" size:24] range:range];
[titletext addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:range];
}];
[myString appendAttributedString:titletext];
if ([self checkIfBig:indexPath]){
NSMutableAttributedString *subtitletext= [[NSMutableAttributedString alloc] initWithString:@"\nLorem Ipsum is simply dummy text of the printing and typesetting industry."];
[subtitletext enumerateAttribute:NSFontAttributeName inRange:(NSRange){0,[subtitletext length]} options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired usingBlock:^(id value, NSRange range, BOOL *stop) {
[subtitletext addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"AvenirNext-Medium" size:14] range:range];
[subtitletext addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:range];
}];
[myString appendAttributedString:subtitletext];
};
if ([self checkIfBig:indexPath]){
NSMutableAttributedString *subtitletext= [[NSMutableAttributedString alloc] initWithString:@"\n\n#HORROR #BLOOD"];
[subtitletext enumerateAttribute:NSFontAttributeName inRange:(NSRange){0,[subtitletext length]} options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired usingBlock:^(id value, NSRange range, BOOL *stop) {
[subtitletext addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"AvenirNext-MediumItalic" size:14] range:range];
[subtitletext addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:range];
}];
[myString appendAttributedString:subtitletext];
};
cell.titleLabel.attributedText=myString;
return cell;
}