rickyngan

loginUserNameTextField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)

loginUserPasswordTextField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)

@objc func textFieldDidChange(_ textField: UITextField) {
    loginButton.enabled = loginUserNameTextField.text.length && loginUserPasswordTextField.text.length
}

rickyngan

let labelHeight = self.addressLabel.intrinsicContentSize().height
self.mapView.padding = UIEdgeInsets(top: self.topLayoutGuide.length, left: 0, 
    bottom: labelHeight, right: 0)
 
UIView.animateWithDuration(0.25) {
  //2
  self.pinImageVerticalConstraint.constant = ((labelHeight - self.topLayoutGuide.length) * 0.5)
  self.view.layoutIfNeeded()
}

rickyngan

extension UIColor {
    convenience init(rgb: UInt) {
        self.init(
            red: CGFloat((rgb & 0xFF0000) >> 16) / 255.0,
            green: CGFloat((rgb & 0x00FF00) >> 8) / 255.0,
            blue: CGFloat(rgb & 0x0000FF) / 255.0,
            alpha: CGFloat(1.0)
        )
    }
}

rickyngan

class var userDateFormatter : NSDateFormatter {
struct Static {
    static let instance: NSDateFormatter = {
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
        return dateFormatter
        }()
    }
    return Static.instance
}

rickyngan

import UIKit

extension UISearchBar {
  
  var textField: UITextField? {
    return self.value(forKey: "_searchField") as? UITextField
  }
}

rickyngan

import UIKit

public extension UIView {
    @available(iOS 10.0, *)
    public func renderToImage(afterScreenUpdates: Bool = false) -> UIImage {
        let rendererFormat = UIGraphicsImageRendererFormat.default()
        rendererFormat.opaque = isOpaque
        let renderer = UIGraphicsImageRenderer(size: bounds.size, format: rendererFormat)

        let snapshotImage = renderer.image { _ in

rickyngan

import 'package:flutter/material.dart';

void main() => runApp(App());

class App extends StatelessWidget {
  @override
   Widget build(BuildContext context) {
    return MaterialApp(
      title: 'My Flutter App',
      home: Home(),

rickyngan

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    title: 'Navigation Basics',
    home: FirstRoute(),
  ));
}

class FirstRoute extends StatelessWidget {

rickyngan

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,

rickyngan

import 'package:flutter/material.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {