- (void)viewDidLoad {
    [super viewDidLoad];

    PostWithHeaderView *postView = [[PostWithHeaderView alloc] initWithFrame:CGRectMake(0, 0, 320, CGFLOAT_MAX)];
    postView.post = self.post;
    self.tableView.tableHeaderView = postView;
}

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];

    UIView *postView = self.tableView.tableHeaderView;
    [postView setNeedsLayout];
    [postView layoutIfNeeded];
    CGFloat height = [postView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
    NSLog(@"HEIGHT %f",height);

    //update the header's frame and set it again
    CGRect headerFrame = postView.frame;
    headerFrame.size.height = height;
    postView.frame = headerFrame;

    self.tableView.tableHeaderView = postView;
}