Resizing UITextView and UITableViewCell - objective-c

Question

I have new to objective C programming and i am currently trying to develop an iOS app. I am loading comment from the server onto the UITextView in the UITableViewCell.
This is the code that is used to load data into the UITextview.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// set the location to read the sample data
static NSString *CellIdentifier = #"CommentCell";
CommentCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[CommentCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
PostModel *posts;
CommentModel *comments;
if (contentTitle == nil) {
posts = _feed.posts[articleIndexPath.section];
comments = posts.comments[indexPath.section];
}
else {
posts = _feed.posts[searchResult];
comments = posts.comments[indexPath.section];
}
NSString *content = comments.content;
content = [content stringByReplacingOccurrencesOfString:#"<p>" withString:#""];
content = [content stringByReplacingOccurrencesOfString:#"</p>" withString:#""];
cell.usernameLabel.text = comments.name;
[cell.commentTextView setScrollEnabled:YES];
cell.commentTextView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
cell.commentTextView.text = content;
[cell.commentTextView sizeToFit];
[cell.commentTextView setScrollEnabled:NO];
[cell.commentTextView setTextColor:[UIColor whiteColor]];
[cell.usernameLabel setTextColor:[UIColor whiteColor]];
// make the borders of the cell round
[cell.layer setCornerRadius:7.0f];
[cell.layer setMasksToBounds:YES];
cell.contentView.layer.borderColor = [[UIColor colorWithRed:51/255 green:56/255 blue:67/255 alpha:1] CGColor];
//make the borders of the image round
[cell.userImage.layer setMasksToBounds:YES];
[cell.userImage.layer setCornerRadius:7.0f];
return cell;
}
This is the code that i used to resize the UITableViewCell and UITextView
- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"CommentCell";
CommentCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
PostModel *posts;
CommentModel *comments;
if (contentTitle == nil) {
posts = _feed.posts[articleIndexPath.section];
comments = posts.comments[indexPath.section];
}
else {
posts = _feed.posts[searchResult];
comments = posts.comments[indexPath.section];
};
if (cell.commentTextView.textContainer.size.height >= 40) {
float height = [self heightForTextView:cell.commentTextView containingString:comments.content];
return height;
}
else {
return 79;
}
}
This is the method that i used to detect the height of the text
- (CGFloat)heightForTextView:(UITextView *)textView containingString:(NSString *)string {
float horizontalPadding = 8;
float verticalPadding = 16;
float widthOfTextView = textView.textContainer.size.width - horizontalPadding;
float height = [string sizeWithFont:textView.font constrainedToSize:CGSizeMake(widthOfTextView, 999999.0f) lineBreakMode:NSLineBreakByWordWrapping].height + verticalPadding;
return height;
}
- (CGSize)text: (NSString *)text sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size {
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(#"7")) {
NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:font, NSFontAttributeName, nil];
CGRect frame = [text boundingRectWithSize:size options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) attributes:attributesDictionary context:nil];
return frame.size;
}
else {
return [text sizeWithFont:font constrainedToSize:size];
}
}
It load fine when i run it initially but when i scroll down and back up, the UITextView became a vertical single line column.
Any help would be greatly appreciated!

Answer 1

I think the this might be the cause:
- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
You are using a dequeued cell's text view to determine the height of the cell. However the dequeued cell may not having any text data (or different text) in it, plus the commentView is UIViewAutoresizingFlexibleWidth, the width calculated by
float widthOfTextView = textView.textContainer.size.width - horizontalPadding;
may be very small under the scenario of scroll down and backup.