Mobile App Dev 2022W: Tutorial 1

This tutorial is still in development.

Getting Started

First, you should configure your Xcode environment and make sure you can successfully run an automatically generated hello world program. Once that all works, move on to the exercises below.

Running square-1

Make a new multiplatform app, call it "square-1", and replace the contents of ContentView.swift with the code below.

Code

ContentView.swift for square-1

//  square-1, ContentView.swift
//
//  for Tutorial 1, COMP 1601 Winter 2022, Carleton University
//  Anil Somayaji, 1/13/22.
//

import SwiftUI

struct ContentView: View {
    @State private var sizeS = ""
    var body: some View {
        VStack{
            Text("Square size:")
            TextField("Enter the Size", text: $sizeS)
                .multilineTextAlignment(.center)
            let size = Double(sizeS) ?? 200
            Rectangle()
            // There are many color spaces, see
            // https://developer.apple.com/documentation/coregraphics/cgcolorspace/1408871-srgb
                .stroke(Color(Color.RGBColorSpace.sRGB,
                              red: 0.0, green: 1.0, blue: 0.5),
                        lineWidth: 10)
                .frame(width: size,
                       height: size)
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}