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WWDC20 · 55 min · Developer Tools / Swift / SwiftUI & UI Frameworks

Introduction to SwiftUI

Explore the world of declarative-style programming: Discover how to build a fully-functioning SwiftUI app from scratch as we explain the benefits of writing declarative code and how SwiftUI and Xcode can combine forces to help you build great apps, faster.

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Code shown on screen · 4 snippets

Views are lightweight swift · at 17:18 ↗ 
struct SandwichDetail: View {
    let sandwich: Sandwich

    var body: some View {
        Image(sandwich.imageName)
            .resizable()
            .aspectRatio(contentMode: .fit)
    }
}
Views are composed swift · at 18:30 ↗ 
struct SandwichDetail: View {
    let sandwich: Sandwich

    var body: some View {
        Image(sandwich.imageName)
            .resizable()
            .aspectRatio(contentMode: .fit)
    }
}
View are dynamic swift · at 19:52 ↗ 
struct SandwichDetail: View {
    let sandwich: Sandwich
    @State private var zoomed = false

    var body: some View {
        Image(sandwich.imageName)
            .resizable()
            .aspectRatio(contentMode: zoomed ? .fill : .fit)
            .onTapGesture { zoomed.toggle() }
    }
}
Where is truth? swift · at 21:40 ↗ 
struct SandwichDetail: View {
    let sandwich: Sandwich
    @State private var zoomed = false

    var body: some View {
        Image(sandwich.imageName)
            .resizable()
            .aspectRatio(contentMode: zoomed ? .fill : .fit)
            .onTapGesture { zoomed.toggle() }
    }
}

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