swiftui-tips-and-tricks.md

SwiftUI tips and ticks

• Resume the live preview

  Option-Cmd-P

• Make @State private

  • @ObjectBinding shared between views
  • @EnvironmentObject shared by many views
  • @State used by the local view

• Prototype with constant bindings

  TextField(.constant("Hello")).textFieldStyle(.roundedBorder)
  Slider(value: .constant(0.5))
  
  

• Combine text views

  struct ContentView : View {
   var body: some View {
       Text("Colored ")
           .color(.red)
       +
       Text("SwifUI ")
               .color(.green)
       +
       Text("Text")
           .color(.blue)
   }
  }
  

• How to make print() work

  right-click on the play button in the preview canvas and choose Debug Preview. With that small change made you’ll find your print() calls work as normal.

• Create custom modifiers

  struct PrimaryLabel: ViewModifier {
    func body(content: Content) -> some View {
        content
            .padding()
            .background(Color.black)
            .foregroundColor(Color.white)
            .font(.largeTitle)
            .cornerRadius(10)
    }
   }
    struct ContentView : View {
    var body: some View {
        Text("Hello World")
            .modifier(PrimaryLabel())
    }
   }
  

References

SwiftUI tips and tricks