robertmryan

class NetworkManager {
    let session: URLSession ＝ {
        let session = URLSession(configuration: .default)
        return session
    }()
    
    deinit {
        session.finishTasksAndInvalidate()
    }
    

robertmryan

func foo(threads: Int) {
    print("starting \(threads) threads")
    
    let semaphore = DispatchSemaphore(value: 0)
    let group = DispatchGroup()
    
    for i in 0 ..< threads {
        DispatchQueue.global().async(group: group) {
            semaphore.wait()
            print("done waiting \(i)")

robertmryan

import UIKit
import os.log

private let logger = Logger(subsystem: "MyApp", category: "ViewController")

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

robertmryan

var task: Task<Void, Error>?

func updateLabelAfterAPICall(initialValue: String) {
    task?.cancel() // just in case
    
    task = Task { [weak self] in
        try await Task.sleep(nanoseconds: 5_500_000_000)
        self?.label.text = "New Value after 5.5 seconds passed"
    }
}

robertmryan

class ViewController: UIViewController {
    lazy var animator = UIDynamicAnimator(referenceView: view)

    override func viewDidLoad() {
        super.viewDidLoad()

        let animatedView = UIView(frame: CGRect(x: 120, y: 100, width: 50, height: 50))
        animatedView.transform = CGAffineTransform(rotationAngle: .pi / 4)
        animatedView.backgroundColor = .blue

robertmryan

struct HoundResponse<T: Decodable>: Decodable {
    var message: T?
    var status: String
}

let url = URL(string: "https://dog.ceo/api/breed/hound/images")!
URLSession.shared.dataTask(with: url) { data, _, error in
    guard let data = data, error == nil else {
        print(error ?? URLError(.badServerResponse))
        return

robertmryan

func fetchBook(id identifier: String) async throws -> GoogleBook {
    var components = URLComponents(string: "https://www.googleapis.com/books/v1/volumes")
    components?.queryItems = [URLQueryItem(name: "q", value: "{" + identifier + "}")]
    guard let url = components?.url else { throw URLError(.badURL) }

    let (data, _) = try await URLSession.shared.data(from: url)
    return try JSONDecoder().decode(GoogleBook.self, from: data)
}

robertmryan

let recognizer = SFSpeechRecognizer()
weak var task: SFSpeechRecognitionTask?  // note weak reference, as the recognition task keeps strong reference for us while the task is underway

deinit {
    task?.cancel()                       // if still running by the time we deallocate, stop it
}

func startRecognition(of fileURL: URL) {
    task?.cancel()                       // if prior task running, stop it

robertmryan

struct Images {
    static func minus(pointSize: CGFloat? = nil) -> UIImage? {
        image(named: "minus", pointSize: pointSize)
    }

    static func trash(pointSize: CGFloat? = nil) -> UIImage? {
        image(named: "trash", pointSize: pointSize)
    }

    private static func image(named name: String, pointSize: CGFloat? = nil) -> UIImage? {

robertmryan

//  CircleView.h
//
//  Created by Robert Ryan on 4/24/21.

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

IB_DESIGNABLE
@interface CircleView : UIView