All course materials are available at https://cs193p.stanford.edu.
The 5th lecture of the 2025 version of Stanford's CS193p course (developing applications for iOS using SwiftUI). The SwiftUI layout system and functional programming. The layout process involves three steps: container Views offer space to subviews, Views choose their own size, and containers position the sized Views. Container Views like HStack/VStack offer space to least flexible Views first (Text, Image) then more flexible ones (Circle, Rectangle). Key layout concepts include Spacer for flexible spacing, layoutPriority() to override default ordering, and lazy containers (LazyVStack, LazyHGrid) for performance with large datasets. Introduces advanced containers like Form, List, Grid, and ViewThatFits. Explains ZStack vs overlay/background View modifiers, debugging with colored backgrounds, and how View modifiers like padding participate in layout. Demonstrates functional programming with map() for Array transformations, shows closure capture of local variables, and refactors the matchAgainst() function using functional programming techniques instead of for-loops, emphasizing the power and elegance of functional approaches in Swift.
Paul Hegarty is a Lecturer who has been teaching CS193p at Stanford since 2010.