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Tackling Auto Layout
Collin Beck
Koedal, Inc.
“tackle: make determined efforts to deal with
(a problem or difficult task)”

–English Dictionary on Mac OS X
Auto Layout

•

“Auto Layout Is a Constraint-Based, Descriptive
Layout System” - Session 202 WWDC 2012
Auto Layout
•

Instead of setting frames, you describe what
constraints a view has and the frames are
AUTOmatically laid out.

•

No more view.frame = CGRect(25, 35, 120, 140)
Auto Layout

•

Linear Equation

•

item1.attribute1 = multiplier ⨉ item2.attribute2 +
constant
Auto Layout
•

Constraints are much more powerful than
springs and struts (auto-resizing masks).
•

Priorities

•

Inequalities

•

Unique view hierarchies
Constraint Rules
•

Constraints must fully define the size and
position of a view.
•

•

intrinsicContentSize

Constraints must not conflict with one an other.
Demo
•

Cross view hierarchy relationships

•

Auto Layout vs Springs and Struts

•

Rotating

•

Screen Size

•

Animations
Debugging Tips
•

Check for ambiguous layout
•

•

po [[UIWindow keyWindow] _autolayoutTrace]

Need for views instantiated not in IB to avoid
auto layout conflicts
•

view.translatesAutoresizingMaskIntoConstraint
s = NO;
Coming in Xcode 5.1

•

Access all constraint
properties in Interface Builder
References
•

Sample Code
•

•

https://github.com/koedal/Auto-Layout-Demo

WWDC 2012
•

Session 202

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Tackling Auto Layout