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//
//  ContentView.swift
//  CollectionView
//
//  Created by Chris Eidhof on 20.08.19.
//  Copyright © 2019 Chris Eidhof. All rights reserved.
//

import SwiftUI

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final class MyCell: UICollectionViewCell {
  
  override var isHighlighted: Bool {
    didSet {
      shrink(down: isHighlighted)
    }
  }
}

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// You can make it nicer by using enum (.down, .up) instead of Bool
func shrink(down: Bool) {
  UIView.animate(withDuration: 0.6) {
    if down {
      cell.transform = CGAffineTransform(scaleX: 0.8, y: 0.8)
    else {
      cell.transform = .identity 
    }
  }
}

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import EarlGrey
import Salsa
import XCTest
@testable import YourApp

class Test: XCTestCase {
  
  override func setup() {
    super.setup()
  }

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{
    "applmusic": {
        "code": "AAPL",
        "quality": "good",
        "line": "She told me don't worry"
    },
    "spotify": {
        "differentcode": "SPOT",
        "music_quality": "good",
        "spotify_specific_code": "absent in apple"

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{
    "applmusic":{
        "code":"AAPL",
        "quality":"good",
        "line":"She told me don't worry",
    },
    "spotify":{
        "differentcode":"SPOT",
        "music_quality":"good",
        "spotify_specific_code":"absent in apple"

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// Linear cell's size animation
UIView.animate(withDuration: self.transitionDuration(using: ctx), animations: {
    // other animations ...

    // card width & height expansion (widthAnc and heightAnc are stored previously)
    self.widthAnc.constant = detailVc.cardContentView.bounds.width
    self.heightAnc.constant = detailVc.cardContentView.bounds.height

    // call layoutIfNeeded() on the animatingContainerOView
    self.animatingContainerView.layoutIfNeeded()

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class SomeTransitionManager: UIPercentDrivenInteractiveTransition, UIViewControllerAnimatedTransitioning {
    // ..
}

// Bind everything together
extension SomeTransitionManager: UIViewControllerTransitioningDelegate {
    func animationController(fortPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {

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class SomeViewController: UIViewController {
    private let serviceBuilder: () -> Service
    private lazy var service: Service = serviceBuilder() // build when it’s really needed.

    // Lazy dependency injection!
    init(service: @escaping @autoclosure () -> Service) {
        serviceBuilder = service
    }

    func fetch() {

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func fetchObject(id: Int, @escaping completion: (Object) -> Void) {
    let request = ...
    APIService.get(request) { result in
        switch result {
        case .success(let object):
            completion(object)
        case .error:
            // make default object, not so flexible here...
            let defaultObject = makeDefaultObject()
            completion(defaultObject)