UITableViewCell custom subviews

Question

I have this in my controller:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"PostCell";

    PostCell *postCell = (PostCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    // Configure the cell...
    Post *post = self.displayPosts[indexPath.row];
    [postCell setPost:post];

    return postCell;
}

With [postCell setPost:post]; I send my custom cell model that its going to use.

- (void)setPost:(Post *)newPost
{
    if (_post != newPost) {
        _post = newPost;
    }
    [self setNeedsDisplay];
}

Now this is version that I have but I want to change it. Now I have [self setNeedsDisplay] which calls drawRect - I want to use subviews and dunno how to initiate that.

Where do I add subviews and if using IBOutlets where do I set subviews values (imageviews image, labels text etc...) based on that _post ??

Or if easier to point me how to add buttons to my cell with drawRect and how to detect touch on images and buttons inside drawRect? That way I wont need to change current version.

Answer 1

- (void)setPost:(Post *)newPost
{
    if (_post != newPost) {
        _post = newPost;
    }

    [self layoutSubviews];
    [self refreshContent];
}

- (void)layoutSubviews
{
    [super layoutSubviews];

    if (self.titleLabel == nil) {
     self.titleLabel = [[UILabel alloc] init];
     [self addSubview:self.titleLabel];
    }

    if (self.imageView == nil) {
     self.imageView = [[UIImageView alloc] init];
     [self addSubview:self.imageView];
    }

    // here I also set frames of label and imageview

}

- (void)refreshContent
{
    [self.titleLabel setText:_post.title];
    [self.imageView setImage:self.post.image];
}

This is the way I've done it and it works great without any lags in UITableView.

Answer 2

- (void)setPost:(Post *)newPost
{
    if (_post != newPost) {
        _post = newPost;
    }
    //check subviews exist and set value by newPost, if need no view, add subview, if need value, set new value
    //Following code is just sample.
    if(!self.imageView){
       self.imageView = [[UIImageView alloc] init];
       [self.contentView addSubview:self.imageView];
    }

    if(newImage){
        self.imageView = newImage;
    }

    [self setNeedsDisplay];
}