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Do Good Daily Day 3

swlkr profile image Sean Walker ・2 min read

πŸ“… 09/14/2019
πŸ”₯ 3 day streak
πŸ“± Do Good Daily
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⌚️ 3 hours spent
πŸ’» 8 files changed, 53 additions(+), 9 deletions(-)
βœ… Today's goal: Recap yesterday

I have a life

It might surprise you but I actually have a life outside of making apps. I don’t want to bore you with the details but I didn’t get much done today.

Let’s dive right in. How do you set the initial state of a swiftUI view? Here’s how I did it

Setting SwiftUI initial state

import SwiftUI

struct MorningReminderView: View {
    @State var hour = 5
    @State var minute = 0

    var body: some View {
        VStack {
        }.onAppear {
            let app = Database().load()
            self.hour = app.morningHour
            self.minute = app.morningMinute
        }
    }
}

Custom fonts in swiftUI

There are three steps

  1. Add the font to the project and make sure it’s added to the target xcode font added to project
  2. Add it to info.plist info plist
  3. Call it in your code
let font = "IM_FELL_English_Roman"
Text("Set Your Morning Reminder Time")
            .font(.custom(font, size: 16))

Serialize app state to a json file

Last thing about swiftUI today, serialize app state to a json file the ghetto way. Two parts, the first part is a class that handles loading and saving to the file along with json serialization, hey it does it all!

import Foundation

public struct App : Codable {
    public var morningHour:Int
    public var morningMinute:Int
    public var eveningHour:Int
    public var eveningMinute:Int
    public var entries:[Entry]
}

public struct Entry : Codable {
    public var goal:String
    public var accomplished:String
    public var timestamp:Int
}

public class Database {
    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    let db = "db.json"

    func getDocumentsDirectory() -> URL {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return paths[0]
    }

    public func save(app: App) {
        let filename: URL = getDocumentsDirectory().appendingPathComponent(db)
        let data: Data = try! JSONEncoder().encode(app)

        try! data.write(to: filename)
    }

    public func load() -> App {
        let filename: URL = getDocumentsDirectory().appendingPathComponent(db)
        do {
            let data = try Data(contentsOf: filename, options: .mappedIfSafe)
            let app = try JSONDecoder().decode(App.self, from: data)

            return app
        } catch {
            return App(morningHour: 7, morningMinute: 30, eveningHour: 21, eveningMinute: 0, entries: [])
        }
    }
}

The second part is the SwiftUI view

import SwiftUI

struct MorningReminderView: View {
    @State var hour = 5
    @State var minute = 0

    var body: some View {
        VStack {
            Button(action: {
                self.saveTime()
            }) {
                Text("Save")
                .frame(width: 200)
                .font(.custom(self.font, size: 24))
                .padding()
                .foregroundColor(Color.black)
                .overlay(
                    RoundedRectangle(cornerRadius: 40)
                        .stroke(Color.black, lineWidth: 2)
                )
            }
        }
    }

    func saveTime() {
        var app = Database().load()
        app.morningHour = self.hour
        app.morningMinute = self.minute
        Database().save(app: app)
    }
}

And that's that for today, I learned quite a bit and I hope it helps you handle the basics of any swiftUI app. Let me know if you want to learn swift, I'm on twitter (probably too much) or just leave a comment and if I can answer any of your questions, I will!

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swlkr profile

Sean Walker

@swlkr

Takes hikes πŸ” Makes sites πŸ‘¨β€πŸ’»

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