Dynamic cell height

gistfile1.m

@implementation TDLessonViewController

static CGFloat kMinimumLessonStepHeight = 88.0f;
static CGFloat kVerticalTextPadding = 20.0f;

static UIFont *kTextLabelFont;
static CGFloat kTextLabelFontSize = 15.0f;
static CGFloat kTextLabelWidth = 250.0f;
static UILineBreakMode kTextLabelLineBreakMode = UILineBreakModeWordWrap;

static UIFont *kNoteLabelFont;
static CGFloat kNoteLabelFontSize = 16.0f;
static CGFloat kNoteLabelWidth = 300.0f;

static NSString *instructionCellIdentifier = @"InstructionCell";
static NSString *noteCellIdentifier = @"NoteCell";

#pragma mark - Initialization
+ (void)initialize
{
    kTextLabelFont = [UIFont boldSystemFontOfSize:kTextLabelFontSize];
    kNoteLabelFont = [UIFont fontWithName:@"Noteworthy-Bold" size:kNoteLabelFontSize];
}

#pragma mark - View Lifecycle

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return (toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown || toInterfaceOrientation == UIInterfaceOrientationPortrait);
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = nil;
    LessonStep *lessonStep = [self.lesson.lessonSteps objectAtIndex:indexPath.row];
    
    if (lessonStep.note)
        cell = [self.tableView dequeueReusableCellWithIdentifier:noteCellIdentifier];
    else
        cell = [self.tableView dequeueReusableCellWithIdentifier:instructionCellIdentifier];
    
    [self configureCell:cell forRowAtIndexPath:indexPath];
        
    return cell;
}

- (void)configureCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    LessonStep *lessonStep = [self.lesson.lessonSteps objectAtIndex:indexPath.row];
    
    [self configureTextLabel:cell.textLabel forRowAtIndexPath:indexPath];
    
    if (!lessonStep.note)
        [self configureImageView:cell.imageView forRowAtIndexPath:indexPath];
}

- (void)configureTextLabel:(UILabel *)label forRowAtIndexPath:(NSIndexPath *)indexPath
{
    LessonStep *lessonStep = [self.lesson.lessonSteps objectAtIndex:indexPath.row];
    label.lineBreakMode = kTextLabelLineBreakMode;
    label.numberOfLines = 0;
    label.text = lessonStep.text;
    
    if (lessonStep.note)
    {
        label.font = kNoteLabelFont;
        label.textColor = [UIColor blackColor];
        
        CGRect textLabelFrame = label.frame;
        textLabelFrame.origin.x = 60.0f;
        textLabelFrame.size.width = kTextLabelWidth;
        label.frame = textLabelFrame;
    }
    else
    {
        label.font = kTextLabelFont;
        label.textColor = [UIColor lessonTextColor];
        
        CGRect textLabelFrame = label.frame;
        textLabelFrame.origin.x = 10.0f;
        textLabelFrame.size.width = kNoteLabelWidth;
        label.frame = textLabelFrame;
    }
}

#pragma mark - UITableViewDelegate
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    LessonStep *lessonStep = [self.lesson.lessonSteps objectAtIndex:indexPath.row];
    CGFloat width = (lessonStep.note) ? kNoteLabelWidth : kTextLabelWidth;
    UIFont *font = (lessonStep.note) ? kNoteLabelFont : kTextLabelFont;
    CGFloat textHeight = [self heightForText:lessonStep.text withWidth:width withFont:font];
    CGFloat paddedHeight = textHeight + kVerticalTextPadding;
        
    if (paddedHeight < kMinimumLessonStepHeight)
        return kMinimumLessonStepHeight;
    
    return paddedHeight;
}

#pragma mark - UITableViewDelegate Helpers
- (CGFloat)heightForText:(NSString *)text withWidth:(CGFloat)width withFont:(UIFont *)font
{
    CGSize calculatedSize = [text sizeWithFont:font constrainedToSize:CGSizeMake(width, CGFLOAT_MAX) lineBreakMode:kTextLabelLineBreakMode];
    
    return calculatedSize.height;
}

@end