-[UITableViewDelegate tableView:heightForRowAtIndexPath:] calculation with n-number of side-by-side content views (like the textLabel and detailTextLabel)

ExampleTableViewDelegate.m

// ...

#pragma mark UITableViewDelegate methods

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSMutableArray *attributes = [NSMutableArray array];

    id labelAttributes = @{
        UITableViewCellNLHeightAttributeText: [self textLabelTextAtIndexPath:indexPath],
        UITableViewCellNLHeightAttributeFont: [self fontForTextLabel],
        UITableViewCellNLHeightAttributeConstrainingSize: [NSValue valueWithCGSize:CGSizeMake(67.0, NSIntegerMax)],
        UITableViewCellNLHeightAttributeLineBreakMode: @(NSLineBreakByWordWrapping)
    };
    [attributes addObject:labelAttributes];

    CGFloat detailWidth = tableView.isEditing ? 174 : 206;
    id valueAttributes = @{
        UITableViewCellNLHeightAttributeText: [self detailTextLabelTextAtIndexPath:indexPath],
        UITableViewCellNLHeightAttributeFont: [self fontForDetailTextLabel],
        UITableViewCellNLHeightAttributeConstrainingSize: [NSValue valueWithCGSize:CGSizeMake(detailWidth, NSIntegerMax)],
        UITableViewCellNLHeightAttributeLineBreakMode: @(NSLineBreakByWordWrapping)
    };
    [attributes addObject:valueAttributes];

    return [UITableViewCell nl_heightForCellWithAttributes:attributes];
}

// ...

UITableViewCell+NLCalculations.h

#import <UIKit/UIKit.h>

@interface UITableViewCell (NLCalculations)

/**
 * Returns the fitted height of a `UITableViewCell` for the given series of
 * attributes (text, font, etc.) representing properties on series of side-by-side
 * content view subviews. The tallest size is what wins!
 *
 * @param attributes
 *            An `NSArray` of `NSDictionary` descriptions of the views' text, font,
 *            constraining size, and line break mode. The dictionary takes the
 *            following form:
 *
 *                {
 *                    UITableViewCellNLHeightAttributeText: NSString
 *                    UITableViewCellNLHeightAttributeFont: UIFont
 *                    UITableViewCellNLHeightAttributeConstrainingSize: CGSize,
 *                    UITableViewCellNLHeightAttributeLineBreakMode: NSLineBreakMode
 *                }
 *
 * @discussion This function can be used within a `UITableViewDelegate` implementation
 *             that needs to dynamically size up the height of various cells that
 *             have content views side-by-side, e.g., the `textLabel` and
 *             `detailTextLabel` of a `UITableViewCell` initialized with the
 *             `UITableViewCellStyleValue2` cell style.
 *
 *                 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 *                 {
 *                     NSMutableArray *attributes = [NSMutableArray array];
 *
 *                     id textLabelAttributes = @{
 *                         UITableViewCellNLHeightAttributeText: [self textLabelTextAtIndexPath:indexPath],
 *                         UITableViewCellNLHeightAttributeFont: [self fontForTextLabel],
 *                         UITableViewCellNLHeightAttributeConstrainingSize: [NSValue valueWithCGSize:CGSizeMake(67.0, NSIntegerMax)],
 *                         UITableViewCellNLHeightAttributeLineBreakMode: @(NSLineBreakByWordWrapping)
 *                     };
 *                     [attributes addObject:textLabelAttributes];
 *
 *                     id detailTextLabelAttributes = @{
 *                         UITableViewCellNLHeightAttributeText: [self detailTextLabelTextAtIndexPath:indexPath],
 *                         UITableViewCellNLHeightAttributeFont: [self fontForDetailTextLabel],
 *                         UITableViewCellNLHeightAttributeConstrainingSize: [NSValue valueWithCGSize:CGSizeMake(206.0, NSIntegerMax)],
 *                         UITableViewCellNLHeightAttributeLineBreakMode: @(NSLineBreakByWordWrapping)
 *                     };
 *                     [attributes addObject:detailTextLabelAttributes];
 *
 *                     return [UITableViewCell nl_heightForCellWithAttributes:attributes];
 *                 }
 *
 */
+ (CGFloat)nl_heightForCellWithAttributes:(NSArray *)attributes;

extern NSString *UITableViewCellNLHeightAttributeText;
extern NSString *UITableViewCellNLHeightAttributeFont;
extern NSString *UITableViewCellNLHeightAttributeConstrainingSize;
extern NSString *UITableViewCellNLHeightAttributeLineBreakMode;

@end

UITableViewCell+NLCalculations.m

#import "UITableViewCell+NLCalculations.h"

@implementation UITableViewCell (NLCalculations)

+ (CGFloat)nl_heightForCellWithAttributes:(NSArray *)attributes
{
    static CGFloat DefaultCellHeight  = 44.0;
    static CGFloat DefaultCellPadding = 10.0;

    NSMutableArray *heights = [NSMutableArray array];
    [heights addObject:@(DefaultCellHeight)];

    for (NSDictionary *attr in attributes)
    {
        NSString *text = attr[UITableViewCellNLHeightAttributeText];
        UIFont *font = attr[UITableViewCellNLHeightAttributeFont];

        NSValue *valueContraint = attr[UITableViewCellNLHeightAttributeConstrainingSize];
        CGSize constraint = (valueContraint) ? valueContraint.CGSizeValue : CGSizeZero;

        NSLineBreakMode lineBreakMode = [attr[UITableViewCellNLHeightAttributeLineBreakMode] integerValue];

        CGSize constrainedSize = [text sizeWithFont:font
                                  constrainedToSize:constraint
                                      lineBreakMode:lineBreakMode];
        CGFloat height = constrainedSize.height + (DefaultCellPadding * 2);

        [heights addObject:@(height)];
    }

    NSNumber *maxHeight = [heights valueForKeyPath:@"@max.floatValue"];

    CGFloat maxHeightFloat = maxHeight.floatValue;

    return maxHeightFloat;
}

NSString *UITableViewCellNLHeightAttributeText = @"UITableViewCellNLHeightAttributeText";
NSString *UITableViewCellNLHeightAttributeFont = @"UITableViewCellNLHeightAttributeFont";
NSString *UITableViewCellNLHeightAttributeConstrainingSize = @"UITableViewCellNLHeightAttributeConstrainingSize";
NSString *UITableViewCellNLHeightAttributeLineBreakMode = @"UITableViewCellNLHeightAttributeLineBreakMode";

@end