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@Tulakshana
Tulakshana / Model.dart
Last active June 12, 2025 23:10
MVVM is an acronym for Model-View-ViewModel. The ViewModel handles logic and state, while View is only for UI, and Model handles data. This is how we could implement this in Flutter. Further reading: https://docs.flutter.dev/app-architecture/guide.
/*
Purpose: Represents your data layer (e.g. API responses, local database models).
*/
class User {
final String name;
final int age;
User({required this.name, required this.age});
}
@Tulakshana
Tulakshana / test.sh
Created November 19, 2024 23:41
Script to run unit tests using xcodebuild. The simulator is configured and launched prior to test execution.
echo "**********************************"
echo "* Create sim if needed *"
echo "**********************************"
test_device_id=$(xcrun simctl list devices | grep "circleci-test-device" | sed 's/ *circleci-test-device *(//' | sed 's/).*//')
if [ -z "$test_device_id" ]; then
echo "Creating test device"
runtime=$(xcrun simctl list runtimes iOS | sed 's/iOS //' | sort -h | tail -1 | sed 's/.* - //' | tr -d '[:space:]')
devicetype=$(xcrun simctl list devicetypes "iPhone " | sort | tail -1 | sed 's/.*(//' | sed 's/).*//' | tr -d '[:space:]')
test_device_id=$(xcrun simctl create "circleci-test-device" "$devicetype" "$runtime" | tr -d '[:space:]')
@Tulakshana
Tulakshana / SwiftMoney.playground
Last active July 10, 2024 17:50
Different currencies have different standards for minor unit (ISO 4217: https://www.iso.org/iso-4217-currency-codes.html). e.g. USD minor units are displayed with two decimal places. JPY doesn’t have a minor unit. The solution is to store the value in minor units and make it client’s responsibility to do the conversion.
import Foundation
let value = 10000 // Value stored in the database along with the currency code
let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .currency
numberFormatter.currencyCode = "USD"
print("\(Double(value)/pow(10, Double(numberFormatter.maximumFractionDigits)))") // 100.0
numberFormatter.currencyCode = "JPY"
@Tulakshana
Tulakshana / smartZip.sh
Created April 7, 2022 02:42
Script to create a zip file in macOS without .DS_Store and __MACOSX files. Run this script inside the folder you want to zip.
zip -r smart.zip . -x "*.DS_Store" -x "__MACOSX"
@Tulakshana
Tulakshana / androidDockerFile
Last active March 13, 2022 08:31
Docker steps to install packages using sdkmanager (Android)
ENV ANDROID_HOME_DIR=/opt/tools/android-sdk-linux
ENV SDK_MANAGER=$ANDROID_HOME/cmdline-tools/bin/sdkmanager
ENV TEMP_DIR=<Path to a temporary directory you download files to. e.g. /tmp/install>
ENV ANDROID_TOOLS_VERSION=30.0.3
ENV ANDROID_BUILD_VERSION=32
ADD <path to SDK tools. Refer command line tools in https://developer.android.com/studio#downloads> $TEMP_DIR/
RUN mkdir -p $ANDROID_HOME_DIR && \
cd $ANDROID_HOME_DIR && \
unzip $TEMP_DIR/<zip file name downloaded above> && \
@Tulakshana
Tulakshana / TouchDetectingView.swift
Created November 18, 2021 15:52
A sub class of UIView with delegate methods to detect pan gestures with direction and displacement.
import UIKit
protocol TouchDetectingViewDelegate: NSObjectProtocol {
func touchDetectingViewDidDetectPan(view: TouchDetectingView,
direction: TouchDetectingView.Direction,
displacement: CGFloat,
state: UIGestureRecognizer.State)
func touchDetectingViewPanEnded(view: TouchDetectingView)
}
@Tulakshana
Tulakshana / VideoHelper.swift
Created August 7, 2019 21:33
Use this to save a video to an album in the phone gallery. The method creates the album if it doesn't exists.
import Photos
class VideoHelper {
private static func createAlbum(name: String, completion: @escaping ((_ collection: PHAssetCollection?) -> Void)) {
//Get PHFetch Options
let fetchOptions = PHFetchOptions()
fetchOptions.predicate = NSPredicate(format: "title = %@", name)
let collection : PHFetchResult = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: fetchOptions)
//Check return value - If found, then get the first album out
@Tulakshana
Tulakshana / NSAttributedString+Image.swift
Created June 6, 2019 18:41
Generate an UIImage from a NSAttributedString
import UIKit
extension NSAttributedString {
func image(size: CGSize) -> UIImage? {
UIGraphicsBeginImageContext(size)
self.draw(at: CGPoint.zero)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
@Tulakshana
Tulakshana / Dictionary.playground
Last active March 12, 2019 13:29
At one of the iOS developer interviews I went, I was asked to replicate the functionality of a Dictionary. I thought I would share what I came up with. Improvements are most welcome.
import Foundation
// This class simulates SWift's dictionary class
class MyDictionary <Key: Equatable, Value> {
private var values: [Value] = []
private var keys: [Key] = []
func set(value: Value, key: Key) {
if keys.contains(key), let index = keys.firstIndex(of: key) {
values[index] = value
@Tulakshana
Tulakshana / NSView+Color.swift
Created January 29, 2019 00:46
NSView's missing setter for background colour
extension NSView {
func setBackgroundColor(color: NSColor) {
let layer = CALayer.init()
layer.backgroundColor = color.cgColor
self.layer = layer
}
}