412 - Auto Layout Techniques in Interface Builder

Changing Layout at runtime

Collapsing a view at runtime.
- Instead of changing the spacing, create a containing view and change its height, so there are no conflicts in IB.
The order when deactivating and activating constraints is important. You get a message in the console if you don't.

Tracking Touch

Layout engine owns frame

Supporting Dynamic Type

Use Accesibility Inspector, choose simulator and change the font size from there.
Vertical Baseline Standard Spacing (iOS 11)
- Similar to Vertical Spacing but based on the text styles and selected fonts.
- Should look better than a fixed spacing.

Safe Areas

Safe Area Layout Guide
- Represents the safe area the view can use, accounting for larger navigation bars, overscan in tvOS, etc.
When using iOS storyboards Constraints automatically upgrade

Proportional Positioning

Position something about 70% from the superview
Use a UIView that size, and not render it.
- Mark the UIView as hidden
- Give it a name in the object library to recognize it
- Add the constraints
- iOS 11 - In the constraints you can targe the safe areas directly.

Stack Views Adaptive Layout

Standard spacing in UIStackView (iOS 11)
Xcode 9 - Hidden property can vary by size classes
- Works great with Stack View
- Backwards deployable!
Use Stack View whenever you can