Proper way to add subview to UITableViewCell contentView - iphone

Question

In my application i need to display multiple images in a UITableView,so i've already searched a lot in the web for the proper way to load large images to UITableViewCells,to be more clearly i'll divide the procedure that my app execute:
Download images asynchronous;
Save them to NSHomeDirectory();
=> Thins part is working perfectly.
The problem is,how to display the images in the UITableViewCell,i've already tried to add UIImageView's to the cell contentView but the scrolling performance were a bit affected,i've searched on Apple guides and i believe the correct way is adding UIImageView's to the cell and loading the images from NSHomeDirectory(),so:
What's the best way to customize a UITableViewCell and add the UIImageView's(302x302px) to it?

Answer 1

To get the best scroll performance, you must draw the content of the UITableViewCell yourself.
Loren Brichter, the author of the Tweetie app (now the official Twitter app), wrote a very famous blog post on this. Sadly, this blog post has been deleted.
This article may help you, though. It explains the fast scrolling, it has examples and it has a video to a presentation from Loren Brichter.
Basically, what you want to do is to subclass UITableViewCell and override the drawRect:method. To show an image, you would do something like the following:
- (void)drawRect:(CGRect)rect
{
[myImage drawAtPoint:CGPointMake(10, 10)];
}
This way you avoid to layout a lot of subviews.

Answer 2

I have the same question.
I'm doing the following:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString* CustomCellIdentifier = #"CustomCellIdentifier";
CustomCell* cell = [tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];
if (cell == nil) {
cell = [[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CustomCellIdentifier];
}
// add subview to cell
if (cell.customView == NULL) {
cell.customView = [[CustomView alloc] initWithFrame:cell.frame];
[cell.contentView addSubview:cell.customView];
}
// bind cell data
return cell;
}

Answer 3

Firstly, you need to create a custom cells for UITableView & keep going through following points.
set height of each row to 302 pixels as
-(CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 302.0;
}
Use following code to create UIImageView at each cell of table
-(UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:#"cell"];
const NSInteger IMAGE_VIEW_TAG=1001;
UIImageView *imageView;
if(cell==nil)
{
cell=[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"] autorelease];
cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
imageView =[[[UIImageView alloc] initWithFrame:CGRectMake(10, 0, 302, 302)] autorelease];
imageView.tag=IMAGE_VIEW_TAG;
imageView.contentMode=UIViewContentModeScaleAspectFit;
[cell.contentView addSubview:imageView];
}
imageView=(UIImageView*)[cell.contentView viewWithTag:IMAGE_VIEW_TAG];
[imageView setImage:[UIImage imageNamed:#"image.png"];
return cell;
}
set number of rows you want to display
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 5;
}
dont forget to add TableView delegate and data source , UITableViewDelegate and UITableViewDataSource