Previews and the Preview Provider
Using #Preview and PreviewProvider to see changes instantly in Xcode.
Welcome
Xcode Previews let you see SwiftUI changes instantly without launching the simulator. They're defined with `#Preview` (Swift 5.9+) or `PreviewProvider`.
#Preview Macro (Swift 5.9+)
```swift
#Preview {
ContentView()
}
```
The simplest preview definition — one line. Xcode renders it in the canvas.
All lessons in this course
- The View Protocol and Body Property
- @State: Local Mutable State in Views
- View Modifiers: Chaining and Custom Modifiers
- Previews and the Preview Provider