kobeumut

Don't expose MutableLiveData

Example from Android Jetpack: LiveData

MutableLiveData Example

Fun with LiveData (Android Dev Summit '18)

kobeumut

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class Encryptor {
    public static String encrypt(String key, String initVector, String value) {
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));

kobeumut

# the instructions from here: https://stackoverflow.com/questions/3704919/installing-rmagick-on-ubuntu/31089915#31089915
# worked, but only after I added in line 8

sudo apt-get purge graphicsmagick graphicsmagick-dbg imagemagick-common imagemagick imagemagick-6.q16 libmagickcore-6-headers libmagickwand-dev graphicsmagick-libmagick-dev-compat
sudo apt-get autoremove
sudo apt-get install imagemagick libmagickwand-dev
sudo ln -s /usr/lib/x86_64-linux-gnu/ImageMagick-6.8.9/bin-Q16/Magick-config /usr/bin/Magick-config
export PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig
gem install rmagick

kobeumut

    override func viewDidAppear(_ animated: Bool) {
        var frame = tableView.frame
        frame.size.height = tableView.contentSize.height
        tableView.frame = frame
        
        tableviewHeightConstraint.constant = tableView.contentSize.height
    }

kobeumut

extension String {
    var twoFractionDigits: String {
        let styler = NumberFormatter()
        styler.minimumFractionDigits = 2
        styler.maximumFractionDigits = 2
        styler.numberStyle = .currency
        let converter = NumberFormatter()
        converter.decimalSeparator = "."
        if let result = converter.number(from: self) {
            return styler.string(for: result) ?? ""

kobeumut

//
//  AdDetailVC.swift
//  
//
//  Created by GriSoft Mobile on 31.03.2018.
//  Copyright © 2018  All rights reserved.
//

import UIKit

kobeumut

let formatter = NumberFormatter()
formatter.generatesDecimalNumbers = true
formatter.numberStyle = NumberFormatter.Style.decimal
if let formattedNumber = formatter.number(from: textValue) as? NSDecimalNumber  {
    xa = formattedNumber
}

kobeumut

//Xib class
import UIKit

protocol CustomViewDelegate: class {         // make this class protocol so you can create `weak` reference
    func goToNextScene()
}

class CustomView: UIView {

    weak var delegate: CustomViewDelegate?   // make this `weak` to avoid strong reference cycle b/w view controller and its views

kobeumut

//Checkbox
import UIKit

class CheckBox: UIButton {
    // Images
    let checkedImage = UIImage(named: "ic_check_box")! as UIImage
    let uncheckedImage = UIImage(named: "ic_check_box_outline_blank")! as UIImage

    // Bool property
    var isChecked: Bool = false {

kobeumut

extension UIImage {
    
    func tinted(color: UIColor) -> UIImage {
        
        UIGraphicsBeginImageContext(self.size)
        guard let context = UIGraphicsGetCurrentContext() else { return self }
        guard let cgImage = cgImage else { return self }
        
        // flip the image
        context.scaleBy(x: 1.0, y: -1.0)