josh-marasigan

let frame1 = CGRect(x: 20, y: 250, width: 157.5, height: 157.5)
let view1 = UIView(frame: frame1)

let frame2 = CGRect(x: 197.5, y: 250, width: 157.5, height: 157.5)
let view2 = UIView(frame: frame2)

josh-marasigan

let view1 = UIView()
view1.backgroundColor = UIColor.systemIndigo
view.addSubview(view1)

view1.snp.makeConstraints { make in
    make.top.equalToSuperview().offset(250)
    make.leading.equalToSuperview().offset(20)
    make.width.height.equalTo(view.snp.width)

josh-marasigan

NSLayoutConstraint(item: view1, attribute: .leading, 
                   relatedBy: .equal,
                   toItem: view, attribute: .leading, 
                   multiplier: 1.0, 
                   constant: 20).isActive = true

josh-marasigan

let view1 = UIView()
view1.backgroundColor = UIColor.systemRed
view1.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(view1)

view1.topAnchor.constraint(equalTo: view.topAnchor, 
                           constant: 250).isActive = true
view1.leadingAnchor.constraint(equalTo: view.leadingAnchor, 

josh-marasigan

/* 
  ex.) The following adds an underline attribute to "an example" within "This is an example". 

    let string = NSMutableAttributedString(string: "This is an example.")

    let underlineAttributes: [NSAttributedStringKey : Any] = [
        NSAttributedStringKey.underlineStyle : NSUnderlineStyle.styleSingle.rawValue
    ]

    string.addAttributeToRange(in: "an example", attributes: underlineAttributes)

josh-marasigan

// `.` indicates code left out. 
// Please refer to the sample app for reference
// https://github.com/josh-marasigan/ObserverDesignExample
class ViewController: UIViewController {
.
.
.
  // MARK: - Button Configuration
  private func configChangeBackgroundButtonUI() {
        .

josh-marasigan

// `.` indicates code left out. 
// Please refer to the sample app for reference
// https://github.com/josh-marasigan/ObserverDesignExample

// Somewhere in the TitleAndTextView.swift file
class TitleAndTextView: UIView {
.
.
.
// MARK: - Class Properties. Fun fact: emojis are just stirng literals

josh-marasigan

struct ObserverKeys {
    static let teal = "observer-example.teal"
    static let pink = "observer-example.magenta"
}

josh-marasigan

// Most verbose: No compiler assumptions are made, the closure to map
// receives a transforming function explicitly casted as (val: Int) -> Int
// Transforms an array of Int and multiplies each value by 10 
arrValues.map({ (val: Int) -> Int in 
               return val * 10 
              })

// Compiler assumes return type for closure, no need to explicitly indicate
arrValues.map({ (val: Int) in 
               return val * 10 

josh-marasigan

let josh = Son()
let joshsMom = Mom(son: josh)
joshsMom.tellJoshWhatToDo()
---
"Washing Dishes"
"Cleaning Room"
"Walking Nala"