Dynamic three row label framing and display

frames.m

// Available coordinates for article text display
CGFloat textDisplayStartX = self.photoView.frame.origin.x + self.photoView.frame.size.width + 10.0;
CGFloat textDisplayWidth = self.frame.size.width - textDisplayStartX - 5.0;

// Line heights
CGFloat titleLabelLineHeight = self.articleTitleLabel.font.lineHeight;
CGFloat detailLabelLineHeight = self.articleDetailsLabel.font.lineHeight;
CGFloat previewLabelLineHeight = self.articlePreviewLabel.font.lineHeight;

// Calculate title label size to determine whether to show the other labels or not
CGSize expectedTitleLabelSize = [self.articleTitleLabel.text sizeWithFont:self.articleTitleLabel.font constrainedToSize:CGSizeMake(textDisplayWidth, self.frame.size.height) lineBreakMode:NSLineBreakByWordWrapping];
NSUInteger expectedTitleLabelLines = floor(expectedTitleLabelSize.height / titleLabelLineHeight);

//
// Decide on the article information frames
//
CGRect articleTitleFrame, articleDetailsFrame, articlePreviewFrame;
CGFloat articleTitleOriginY, articleDetailsOriginY, articlePreviewOriginY;

articleTitleFrame = CGRectZero;
articleDetailsFrame = CGRectZero;
articlePreviewFrame = CGRectZero;

// No space for other things
// Use full frame size for vertical alignment
if (expectedTitleLabelLines == 3)
{
    // Fully centered vertically with others hidden
    articleTitleFrame = CGRectMake(textDisplayStartX, 0.0, textDisplayWidth, self.frame.size.height);
}
// Title is one or two lines:
// Deduct details row line height from frame height
// Deduct title row line height from frame height
// Maybe deduct preview row line height from frame height
// Split remaining space into two
// Make that origin.y
else
{
    CGFloat finalFrameHeight = self.frame.size.height;
    finalFrameHeight = finalFrameHeight - expectedTitleLabelSize.height;
    finalFrameHeight = finalFrameHeight - detailLabelLineHeight;

    // Include content preview line height (and some padding)
    if (expectedTitleLabelLines == 1) {
        finalFrameHeight = finalFrameHeight - previewLabelLineHeight;
    }

    // Half of remaining space to be used for title's top origin
    articleTitleOriginY = finalFrameHeight / 2;

    // Details label to be a little below the title
    articleDetailsOriginY = articleTitleOriginY + expectedTitleLabelSize.height;

    // Title frame
    articleTitleFrame = CGRectMake(textDisplayStartX, articleTitleOriginY, textDisplayWidth, expectedTitleLabelSize.height);

    // Details frame
    articleDetailsFrame = CGRectMake(textDisplayStartX, articleDetailsOriginY, textDisplayWidth, detailLabelLineHeight);

    // Preview frame
    if (expectedTitleLabelLines == 1) {
        articlePreviewOriginY = articleDetailsOriginY + detailLabelLineHeight;
        articlePreviewFrame = CGRectMake(textDisplayStartX, articlePreviewOriginY, textDisplayWidth, previewLabelLineHeight);
    }
}

[self.articleTitleLabel setFrame:articleTitleFrame];
[self.articleDetailsLabel setFrame:articleDetailsFrame];
[self.articlePreviewLabel setFrame:articlePreviewFrame];