Optimizing App Assets

WWDC 2018

Image Compression

Do not always select the ‘Automatic’ !!
Choose the appropriate compression type

Automatic Image Packing

Lossy compression

• Quality vs Size (trade off)

Lossless compression

Deployment target and app thinning

Working Space

• Use consistent color settings for all design files

Stretchable Images

Vector Assets

• Preserve Vector Data enables runtime resizing
• Works better with Dynamic Type!

Design for 2x

• Point boundary snapping ensures device pixel alignment
• Vector assets can use a 2x grid for optimal stroke placement

Namespaces 👍

• Large collections are a naming challenge
• Folders with namespace for grouping!

Using Performance Classes

Sprite Altlases