Remove and add Subview to Custom UITableViewCell - ios

Question

i have a Custom Cell with different Subviews on it. One of them, a UIImageView, is optional. so there can be the case that no Image is needed in the cell. My Problem is that i dont know how i can remove the Image for cells which dont need it, and how to add the image for cell which need it? I know i only should add and remove subviews like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier1 = #"NewsCell";
GTNewsCustomCell *newsCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier1];
if(newsCell == nil){
newsCell = [[GTNewsCustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier1];
//Here i get the Image from my Array (self.newsList)
NSString *boardImg = [[self.newsList objectAtIndex:indexPath.section] valueForKey:#"boardnoteImage"];
//Here im checkin if an image exists
if(boardImg == (NSString *)[NSNull null] || boardImg == nil || boardImg.length == 0){
//If no Image exists remove the subview
[newsCell.boardNoteImage removeFromSuperview];
} else {
//If an image exists, check if the subview is already added
if(![newsCell.boardNoteImage isDescendantOfView:newsCell.contentView ]) {
[newsCell.contentView addSubview:[newsCell.boardNoteImage];
}
}
}
But that doesnt work because now i get the same Image on each cell......
EDIT:
Sry i forget to say that i´m using Section with only one row per section, thats the reason why i´m using indexPath.section!
I get all my Datas, from an webserver and put all the stuff into my array self.newsList!
EDIT2:
With this Code i get the correct Images for the correct Cells, but after scrolling down and back up, everyhting is disappeared :/
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier1 = #"NewsCell";
GTNewsCustomCell *newsCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier1];
if(newsCell == nil){
newsCell = [[GTNewsCustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier1];
}
NSString *boardImg = [[self.newsList objectAtIndex:indexPath.section] valueForKey:#"boardnoteImage"];
if(boardImg == (NSString *)[NSNull null] || boardImg == nil || boardImg.length == 0){
[newsCell.boardNoteImage removeFromSuperview];
newsCell.boardNoteImage.image = nil;
} else {
if(![newsCell.boardNoteImage isDescendantOfView:newsCell.contentView ]) {
newsCell.boardNoteImage.frame = CGRectMake(newsCell.boardNoteImage.frame.origin.x, newsCell.boardNoteImage.frame.origin.y, newsCell.boardNoteImage.frame.size.width, newsCell.boardNoteImage.frame.size.height);
[newsCell.contentView addSubview:newsCell.boardNoteImage];
}
}

Answer 1

Try this approach - Add UIImageView in storyboard and you can just hide and unhide whenever you app logic required.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
GTNewsCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:#"SongCell"];
if(cell == nil)
{
cell = [[CustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"SongCell"];
//dont check the presence of image in this part becz it is called during creation only not on resuing
}
//check if image is present or not
NSString *boardImg = [[self.newsList objectAtIndex:indexPath.row] valueForKey:#"boardnoteImage"];
if(boardImg)
{
//image is present
cell.boardNoteImage.hidden = NO;
cell.boardNoteImage.image = boardImg;
}
else
{
cell.boardNoteImage.frame = CGRectZero;//which places a zero rect means no image
cell.boardNoteImage.hidden = YES;
}
return cell;
}

Answer 2

Please use this one:
NSString *boardImg = [[self.newsList objectAtIndex:indexPath.row] valueForKey:#"boardnoteImage"];
You require to use indexPath.row instead of indexPath.section

Answer 3

You are adding the image for section. So, do as following :
NSString *boardImg = [[self.newsList objectAtIndex:indexPath.row] valueForKey:#"boardnoteImage"];
if(boardImg == (NSString *)[NSNull null] || boardImg == nil || boardImg.length == 0){
//If no Image exists remove the subview
[newsCell.boardNoteImage removeFromSuperview];
newsCell.boardNoteImage = nil;
} else {
//set the frames here if required
[newsCell addSubview:boardNoteImage];
}
Edit 1 :
if(boardImg == (NSString *)[NSNull null] || boardImg == nil || boardImg.length == 0){
[newsCell.boardNoteImage removeFromSuperview];
newsCell.boardNoteImage.image = nil;
} else {
if(![newsCell.boardNoteImage isDescendantOfView:newsCell.contentView ]) {
newsCell.boardNoteImage = [[UIImageView alloc] init];
// SET THE IMAGE HERE
newsCell.boardNoteImage.frame = CGRectMake(newsCell.boardNoteImage.frame.origin.x, newsCell.boardNoteImage.frame.origin.y, newsCell.boardNoteImage.frame.size.width, newsCell.boardNoteImage.frame.size.height);
[newsCell.contentView addSubview:newsCell.boardNoteImage];
}

Answer 4

try by this way, dont check the presence of image inside if condition do like below hope this helps u, change it to your requirement
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
GTNewsCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:#"SongCell"];
if(cell == nil)
{
cell = [[CustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"SongCell"];
//dont check the presence of image in this part becz it is called during creation only not on resuing
}
//check if image is present or not
NSString *boardImg = [[self.newsList objectAtIndex:indexPath.row] valueForKey:#"boardnoteImage"];
if(boardImg)
{
//image is present
cell.boardNoteImage.image = boardImg;
}
else
{
cell.boardNoteImage.frame = CGRectZero;//which places a zero rect means no image
cell.boardNoteImage. hidden = YES;//place a nil in the image
}
return cell;
}

Answer 5

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
//static NSString *CellIdentifier1 = #"NewsCell";
NSString *CellIdentifier1 = [NSString stringWithFormat:#"cell %d",indexPath.row];
GTNewsCustomCell *newsCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier1];
newsCell = nil;
if(newsCell == nil)
{
newsCell = [[GTNewsCustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier1];
//Here i get the Image from my Array (self.newsList)
NSString *boardImg = [[self.newsList objectAtIndex:indexPath.section] valueForKey:#"boardnoteImage"];
//Here im checkin if an image exists
if(boardImg == (NSString *)[NSNull null] || boardImg == nil || boardImg.length == 0){
//If no Image exists remove the subview
[newsCell.boardNoteImage removeFromSuperview];
} else {
//If an image exists, check if the subview is already added
if(![newsCell.boardNoteImage isDescendantOfView:newsCell.contentView ]) {
[newsCell.contentView addSubview:[newsCell.boardNoteImage];
}
}
}