Practical Auto Layout: Beginning Auto Layout Techniques for iOS8 (2015)
Chapter 1. About Autolayout and Size Classes
Chapter 2. Auto Layout Basic Concepts
Chapter 3. Beginning with Auto Layout
Chapter 6. Compact Width Class Size
Chapter 7. Proportional Sizes and the Multiplier
Chapter 8. Regular Size Classes
Chapter 9. Fixing Conflicting Constraints
Chapter 10. Calculator - Style Buttons in Autolayout
Chapter 11. Working with Images in Auto Layout
Chapter 12. Constraint Priorities
Chapter 13. Where To Go From Here