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SwiftUI Fetch JSON data display into list and view details to another view
Learn how to create an API call to get data from a remote JSON file and display this data in a SwiftUI list
I used dropbox to host my json file url : https://dl.dropboxusercontent.com/s/1y7yqdefyayegzo/employeelist.json?dl=0
ContentView.swift
//
// ContentView.swift
// Testapp
//
// Created by Cairocoders
//
import SwiftUI
struct User: Decodable {
let id: String
let name: String
let email: String
let about: String
}
struct ContentView: View {
@State var users = [User]()
var body: some View {
NavigationView {
List{
ForEach(users, id: \.id) { item in
NavigationLink(destination: details(item: item)) {
HStack {
//Image("user")
//.resizable()
//.frame(width: 50, height: 50)
//.clipShape(Circle())
//.overlay(Circle().stroke(Color.white, lineWidth: 4))
Text(item.name)
.font(.headline)
//Text(item.email)
//Text(item.about)
}.padding(7)
}
}
}
.onAppear(perform: loadData)
.navigationTitle("Navigation")
}
}
func loadData() {
guard let url = URL(string: "https://dl.dropboxusercontent.com/s/1y7yqdefyayegzo/employeelist.json?dl=0") else {
print("Invalid URL")
return
}
let request = URLRequest(url: url)
URLSession.shared.dataTask(with: request) {data, response, error in
if let data = data {
//pull out the declaration of the decoder object
let decoder = JSONDecoder()
//set how we want to interpret dates in the JSON
decoder.dateDecodingStrategy = .iso8601
//decode directly to an array of User structs rather than a Response
if let decodedResponse = try?
decoder.decode([User].self, from: data) {
DispatchQueue.main.async {
//decodedResponse is now [User] rather than Response.User
self.users = decodedResponse
}
return
}
}
print("Fetch failed: \(error?.localizedDescription ?? "Unknown error")")
}.resume()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
details.swift
//
// details.swift
// Testapp
//
// Created by Cairocoders
//
import SwiftUI
struct details: View {
let item: User
var body: some View {
VStack {
Image("user")
.clipShape(Circle())
.overlay(
Circle().stroke(Color.orange, lineWidth: 4)
)
.shadow(radius: 10)
Text(item.name)
.font(.title)
Text(item.email)
.font(.subheadline)
Divider()
Text(item.about)
.font(.headline)
.multilineTextAlignment(.center)
.lineLimit(50)
}.padding()
}
}
SwiftUI Lists and Navigation displays a list of SF Simbles
simple app that displays a list of SF Simbles, tapping on any of the SF Simbles will let you navigate to a different view showing details
//
// ContentView.swift
// Devapp
//
// Created by Cairocoders
//
import SwiftUI
struct ContentView: View {
private let SFsimbleList: [SFsimbleItem] = [
SFsimbleItem(
sfsimble: "photo.tv",
name: "Photo Tv",
description: "SF Symbols provides a set of over 1,500 consistent, highly configurable symbols you can use in your app. Apple designed SF Symbols to integrate seamlessly with the San Francisco system font."),
SFsimbleItem(
sfsimble: "display.2",
name: "Display",
description: "SF Symbols provides a set of over 1,500 consistent, highly configurable symbols you can use in your app. Apple designed SF Symbols to integrate seamlessly with the San Francisco system font."),
SFsimbleItem(
sfsimble: "server.rack",
name: "Server Rack",
description: "SF Symbols provides a set of over 1,500 consistent, highly configurable symbols you can use in your app. Apple designed SF Symbols to integrate seamlessly with the San Francisco system font."),
SFsimbleItem(
sfsimble: "iphone",
name: "Iphone",
description: "SF Symbols provides a set of over 1,500 consistent, highly configurable symbols you can use in your app. Apple designed SF Symbols to integrate seamlessly with the San Francisco system font."),
SFsimbleItem(
sfsimble: "applewatch",
name: "Apple watch",
description: "SF Symbols provides a set of over 1,500 consistent, highly configurable symbols you can use in your app. Apple designed SF Symbols to integrate seamlessly with the San Francisco system font."),
SFsimbleItem(
sfsimble: "earpods",
name: "Earpods",
description: "SF Symbols provides a set of over 1,500 consistent, highly configurable symbols you can use in your app. Apple designed SF Symbols to integrate seamlessly with the San Francisco system font."),
]
var body: some View {
NavigationView {
List(SFsimbleList) { SFsimbleItem in
NavigationLink(destination: DetailsView(SFsimbleItem: SFsimbleItem)) {
HStack {
SFSimbleView(SFsimbleItem: SFsimbleItem)
Text(SFsimbleItem.name)
.font(.headline)
}.padding(7)
}
}
.navigationBarTitle("SF Symbols in SwiftUI")
}
}
}
struct DetailsView: View {
let SFsimbleItem: SFsimbleItem
var body: some View {
VStack(alignment: .leading) {
HStack {
SFSimbleView(SFsimbleItem: SFsimbleItem)
.padding(.trailing, 5)
Text(SFsimbleItem.name)
.font(.largeTitle)
.bold()
Spacer()
}
Text(SFsimbleItem.description)
.padding(.top)
Spacer()
}
.padding()
.navigationBarTitle(Text(SFsimbleItem.name), displayMode: .inline)
}
}
struct SFSimbleView: View {
let SFsimbleItem: SFsimbleItem
var body: some View {
ZStack {
Image(systemName: SFsimbleItem.sfsimble).foregroundColor(.red)
.font(.system(size: 40))
.shadow(radius: 3)
}
}
}
struct SFsimbleItem: Identifiable {
let id = UUID()
let sfsimble: String
let name: String
let description: String
}
struct details_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
INSERT INTO state (id, name, country_id) VALUES (1, 'ARMM', 171);
INSERT INTO state (id, name, country_id) VALUES (2, 'Bicol', 171);
INSERT INTO state (id, name, country_id) VALUES (3, 'Central Luzon', 171);
INSERT INTO state (id, name, country_id) VALUES (4, 'Central Mindanao', 171);
INSERT INTO state (id, name, country_id) VALUES (5, 'Alabama', 227);
INSERT INTO state (id, name, country_id) VALUES (6, 'Alaska', 227);
INSERT INTO state (id, name, country_id) VALUES (7, 'Arizona', 227);
INSERT INTO state (id, name, country_id) VALUES (8, 'California', 227);
INSERT INTO state (id, name, country_id) VALUES (9, 'Florida', 227);
CREATE TABLE city (
id serial PRIMARY KEY,
state VARCHAR ( 60 ) NOT NULL,
name VARCHAR ( 60 ) NOT NULL,
stateid INT NOT NULL
);
INSERT INTO city (id, state, name, stateid) VALUES (1, 'CA', 'Anaheim', 8);
INSERT INTO city (id, state, name, stateid) VALUES (2, 'NV', 'Arden-Arcade', 8);
INSERT INTO city (id, state, name, stateid) VALUES (3, 'CA', 'Bakersfield', 8);
INSERT INTO city (id, state, name, stateid) VALUES (4, 'CA', 'Carson', 8);
INSERT INTO city (id, state, name, stateid) VALUES (5, 'NV', 'Daly City', 8);
INSERT INTO city (id, state, name, stateid) VALUES (6, 'AC', 'Angeles City', 3);
INSERT INTO city (id, state, name, stateid) VALUES (7, 'OC', 'Olongapo', 3);
INSERT INTO city (id, state, name, stateid) VALUES (8, 'SF', 'San Fernando', 3);
INSERT INTO city (id, state, name, stateid) VALUES (9, 'TA', 'Tarlac', 3);
app.py
#app.py
from flask import Flask, render_template, request, jsonify
from flask_sqlalchemy import SQLAlchemy
from wtforms import SelectField
from flask_wtf import FlaskForm #https://flask-wtf.readthedocs.io/en/stable/
app = Flask(__name__)
app.config['SECRET_KEY'] = 'cairocoders-ednalan'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
#password:admin
app.config['SQLALCHEMY_DATABASE_URI']='postgresql://postgres:admin@localhost/sampledb' #install psycopg2 https://pypi.org/project/psycopg2/
db = SQLAlchemy(app)
class Country(db.Model):
__tablename__ = 'countries'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(60))
class State(db.Model):
__tablename__ = 'state'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(60))
country_id = db.Column(db.Integer)
class City(db.Model):
__tablename__ = 'city'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(60))
stateid = db.Column(db.Integer)
class Form(FlaskForm):
country = SelectField('country', choices=[])
state = SelectField('state', choices=[])
city = SelectField('city', choices=[])
@app.route('/', methods=['GET', 'POST'])
def index():
form = Form()
form.country.choices = [(country.id, country.name) for country in Country.query.all()]
if request.method == 'POST':
city = City.query.filter_by(id=form.city.data).first()
country = Country.query.filter_by(id=form.country.data).first()
state = State.query.filter_by(id=form.state.data).first()
return '
Country : {}, State: {}, City: {}
'.format(country.name, state.name, city.name)
return render_template('index.html', form=form)
@app.route('/state/')
def statebycountry(get_state):
state = State.query.filter_by(country_id=get_state).all()
stateArray = []
for city in state:
stateObj = {}
stateObj['id'] = city.id
stateObj['name'] = city.name
stateArray.append(stateObj)
return jsonify({'statecountry' : stateArray})
@app.route('/city/')
def city(get_city):
state_data = City.query.filter_by(stateid=get_city).all()
cityArray = []
for city in state_data:
cityObj = {}
cityObj['id'] = city.id
cityObj['name'] = city.name
cityArray.append(cityObj)
return jsonify({'citylist' : cityArray})
if __name__ == '__main__':
app.run(debug=True)
This shopping cart have no checkout option and payment option this is about to display product and add item to cart remove item from cart remove all items from cart
app.py
#app.py
from flask import Flask, session, render_template, request, redirect, url_for
import psycopg2 #pip install psycopg2
import psycopg2.extras
app = Flask(__name__)
app.secret_key = "cairocoders-ednalan"
DB_HOST = "localhost"
DB_NAME = "sampledb"
DB_USER = "postgres"
DB_PASS = "admin"
conn = psycopg2.connect(dbname=DB_NAME, user=DB_USER, password=DB_PASS, host=DB_HOST)
@app.route('/')
def products():
cursor = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
cursor.execute("SELECT * FROM product")
rows = cursor.fetchall()
return render_template('products.html', products=rows)
@app.route('/add', methods=['POST'])
def add_product_to_cart():
_quantity = int(request.form['quantity'])
_code = request.form['code']
# validate the received values
if _quantity and _code and request.method == 'POST':
cursor = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
cursor.execute('SELECT * FROM product WHERE code = %s', (_code,))
row = cursor.fetchone()
itemArray = { row['code'] : {'name' : row['name'], 'code' : row['code'], 'quantity' : _quantity, 'price' : row['price'], 'image' : row['image'], 'total_price': _quantity * row['price']}}
all_total_price = 0
all_total_quantity = 0
session.modified = True
if 'cart_item' in session:
if row['code'] in session['cart_item']:
for key, value in session['cart_item'].items():
if row['code'] == key:
old_quantity = session['cart_item'][key]['quantity']
total_quantity = old_quantity + _quantity
session['cart_item'][key]['quantity'] = total_quantity
session['cart_item'][key]['total_price'] = total_quantity * row['price']
else:
session['cart_item'] = array_merge(session['cart_item'], itemArray)
for key, value in session['cart_item'].items():
individual_quantity = int(session['cart_item'][key]['quantity'])
individual_price = float(session['cart_item'][key]['total_price'])
all_total_quantity = all_total_quantity + individual_quantity
all_total_price = all_total_price + individual_price
else:
session['cart_item'] = itemArray
all_total_quantity = all_total_quantity + _quantity
all_total_price = all_total_price + _quantity * row['price']
session['all_total_quantity'] = all_total_quantity
session['all_total_price'] = all_total_price
return redirect(url_for('products'))
else:
return 'Error while adding item to cart'
@app.route('/empty')
def empty_cart():
try:
session.clear()
return redirect(url_for('.products'))
except Exception as e:
print(e)
@app.route('/delete/')
def delete_product(code):
try:
all_total_price = 0
all_total_quantity = 0
session.modified = True
for item in session['cart_item'].items():
if item[0] == code:
session['cart_item'].pop(item[0], None)
if 'cart_item' in session:
for key, value in session['cart_item'].items():
individual_quantity = int(session['cart_item'][key]['quantity'])
individual_price = float(session['cart_item'][key]['total_price'])
all_total_quantity = all_total_quantity + individual_quantity
all_total_price = all_total_price + individual_price
break
if all_total_quantity == 0:
session.clear()
else:
session['all_total_quantity'] = all_total_quantity
session['all_total_price'] = all_total_price
return redirect(url_for('.products'))
except Exception as e:
print(e)
def array_merge( first_array , second_array ):
if isinstance( first_array , list ) and isinstance( second_array , list ):
return first_array + second_array
elif isinstance( first_array , dict ) and isinstance( second_array , dict ):
return dict( list( first_array.items() ) + list( second_array.items() ) )
elif isinstance( first_array , set ) and isinstance( second_array , set ):
return first_array.union( second_array )
return False
if __name__ == "__main__":
app.run(debug=True)
