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apple-text-measurement

Measure text dimensions with NSString and TextKit APIs for layout decisions.

Updated Mar 19, 2026
Search Tags:#layout#textkit#attributed-string#text-measurement#bounding-rect#nsstring
One-click install
npx skills add https://github.com/sitapix/apple-text --skill apple-text-measurement
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: apple-text-measurement
Source: https://github.com/sitapix/apple-text/tree/main/skills/apple-text-measurement
Command: npx skills add https://github.com/sitapix/apple-text --skill apple-text-measurement

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Text rendering and layout often require precise measurement to size views and ensure correct line-wrapping. This skill provides guidance and patterns for measuring text dimensions using NSString/NSAttributedString APIs and TextKit.

Core Features & Use Cases

  • Single-line and multi-line measurement patterns
  • Per-line metrics with TextKit 1 and TextKit 2
  • Guidance for proper options, rounding, and layout validations
  • Use cases include sizing UILabels, UITextView, and custom text views

Quick Start

Ask me to measure text size for a given font, width, and attributes to determine layout height.

Frequently Asked Questions about apple-text-measurement

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I measure NSAttributedString bounding rect for multi-line layout height?▼

To measure NSAttributedString dimensions, apply TextKit measurement APIs with proper options like .usesLineFragmentOrigin and .usesFontLeading, then apply ceil() rounding to the bounding rect for reliable multi-line layout height calculations.

Why does my text measurement return incorrect height for UILabel sizing?▼

Incorrect text measurement height often results from missing layout-before-measure validations or omitting .usesLineFragmentOrigin options, which are required for proper NSString and NSAttributedString sizing across TextKit 1 and TextKit 2.

What's the best way to get per-line text metrics using TextKit 2?▼

Per-line text metrics with TextKit 2 require using TextKit measurement APIs to evaluate each line fragment origin, applying font and paragraph style constraints within a specified container width to produce accurate per-line dimensions.

Does NSString sizing work for both single-line and multi-line text layout scenarios?▼

NSString sizing works for both single-line and multi-line text layout scenarios by applying appropriate measurement options and container width constraints, ensuring accurate dimensions for UILabels, UITextView, and custom text views.

When do I need to use ceil() rounding for attributed string measurement?▼

You need ceil() rounding for attributed string measurement when converting fractional text dimensions to integer pixel values for view layout, preventing visual clipping caused by floating-point truncation in bounding rect calculations.

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