SwiftUI Stretchable Header View Implementation
Article Summary
Oleg Tsibulevskiy from Just Eat Takeaway shows how to build one of iOS's most popular UI effects with surprisingly little code. The stretchable header that zooms and stretches as users scroll? It's easier than you think in SwiftUI.
This tutorial breaks down creating a stretchable header view for a restaurant menu screen using SwiftUI. The implementation uses GeometryReader to track scroll position and dynamically adjust the header's offset and height, creating that smooth zoom effect seen in apps like Spotify and Instagram.
Key Takeaways
- GeometryReader tracks scroll direction to control header offset and height dynamically
- LazyVStack (iOS 14+) simplifies list building compared to UIKit approaches
- AspectRatio modifier creates the zoom effect when stretching down
- Complete implementation wraps header and list in single ScrollView
Critical Insight
SwiftUI's GeometryReader and built-in modifiers make creating professional stretchable headers straightforward without complex scroll calculations.
