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Introducing View Constraints: The Core iOS 6 Developer's Cookbook
- By Erica Sadun
- Published Sep 19, 2012 by Addison-Wesley Professional. Part of the Developer's Library series.
- Copyright 2013
- Pages: 40
- Edition: 1st
- eBook (Watermarked)
- ISBN-10: 0-13-336441-0
- ISBN-13: 978-0-13-336441-5
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Product Author Bios
Erica Sadun is the bestselling author, co-author and contributor to over two-dozen books on Programming, Digital Video, Digital Photography, and Web Design, among others. She has blogged for TUAW.com and O'Reilly's Mac Devcenter and Digital Media sites, and now regularly blogs for Ars Technica. In addition to being the author of over a dozen iPhone-native applications, Erica holds a Ph. D. in Computer Science from Georgia Tech's Graphics, Visualization and Usability Center. A geek, a programmer, and an author, she's never met a gadget she didn't love.
When not writing, she and her geek husband parent three adorable geeks-in-training, who regard their parents with restrained bemusement.
The iOS 6 software development kit (SDK) has revolutionized view layout. Apple's layout features will make your life easier and your interfaces more consistent, regardless of device geometry and orientation. In this excerpt from The iOS Developer's Cookbook-Core Recipes for Programmers (Early Edition), bestselling author and developer Erica Sadun introduces code-level constraint development. You'll discover how to create relations between on-screen objects and specify the way iOS automatically arranges your views. The outcome is a set of robust rules that adapt to screen geometry.
This digital short is an adapted excerpt from The Core iOS 6 Developer's Cookbook (Early Edition), 4th Edition (ISBN 9780133361704). The content of this digital short may differ slightly from the content in the book. Purchasers of this digital short are invited to use coupon code sadunviewconst good for 30% off the list price of the book on InformIT exclusively.
Table of Contents
What Are Constraints?
Alignment Rectangles
Declaring Alignment Rectangles
Constraint Attributes
Constraint Math
The Laws of Constraints
Creating Constraints
Basic Constraint Declarations
Visual Format Constraints
Variable Bindings
Format Strings
Orientation
View Names
Connections
Predicates
Metrics
View-to-View Predicates
Priorities
Format String Summary
Storing and Updating Constraints
Recipe: Comparing Constraints
Recipe: Describing Constraints
Recipe: Creating Fixed-Size Constrained Views
Disabling Autosizing Constraints
Starting within View Bounds
Constraining Size
Recipe: Centering Views
Recipe: Setting Aspect Ratio
Aligning Views and Flexible Sizing
Why You Cannot Distribute Views
Recipe: Responding to Orientation Changes
Constraint Macros
Consistent Constraints
Sufficient Constraints
Macros
Debugging Your Constraints
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