iOS

Kas viimase WWDC ajal oli huvitavaid sessioone/rakendusi, mida soovite oma töös proovida?

Kas projektis sisaldab veel makro-sid, välja arvatud võrgu kiht?

protokoļs CacheProtocol { associatedtype Value func setValue(_ value: Value?, forKey key: String) func getValue(forKey key: String) -> Value? func fetchValue(forKey key: String, completion: @escaping (Value?) -> Void) } final class Cache<T>: CacheProtocol { private var storage: [String: T] = [:] func setValue(_ value: T?, forKey key: String) { storage[key] = value } func getValue(forKey key: String) -> T? { return storage[key] } func fetchValue(forKey key: String, completion: @escaping (T?) -> Void) { let value = storage[key] completion(value) } } import XCTest final class CacheTests: XCTestCase { override func setUp() { super.setUp() } func testSetAndGetValue() { let cache = Cache<String>() let key: String = "key" let value: String = "value" cache.setValue(value, forKey: key) XCTAssertEqual(cache.getValue(forKey: key), value) cache.setValue(nil, forKey: key) XCTAssertTrue(cache.getValue(forKey: key) == nil) } } CacheTests.defaultTestSuite.run()

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Miks valisite sõnastiku vahemälutalletiseks?

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viimeinen luokka Cache<T>: CacheProtocol { func getValue(forKey key: String) -> T? { return storage[key] } func fetchValue(forKey key: String, completion: @escaping (T?) -> Void) { let value = storage[key] completion(value) } } viimeinen luokka CacheTests: XCTestCase { override func setUp() { super.setUp() } func testSetAndGetValue() { let cache = Cache<String>() let key: String = "key" let value: String = "value" cache.setValue(value, forKey: key) XCTAssertEqual(cache.getValue(forKey: key), value) cache.setValue(nil, forKey: key) XCTAssertTrue(cache.getValue(forKey: key) == nil) } func testCompletion() { } } CacheTests.defaultTestSuite.run()

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Räägi mulle SwiftUI kasutamisest projektis — mis on poliitika, mitu ekraani on kirjutatud SwiftUI-s

Räägi kasulikest Property Wrapper'itest, mida sa projektis kasutasid

import UIKit protokoll CacheProtocol { associatedtype Value func setValue(_ value: Value?, forKey key: String) func value(forKey key: String) -> Value? func fetchValue(forKey key: String, completion: @escaping (Value?) -> Void) }

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// Kirjutab `data` faili nimega `file`. func writeData(_ data: Data, to file: String) { let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! let fileURL = documentDirectoryURL.appendingPathComponent(file) try? data.write(to: fileURL) } // Eemaldab faili nimega `file`. func remove(file: String) { let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! let fileURL = documentDirectoryURL.appendingPathComponent(file) try? FileManager.default.removeItem(at: fileURL) } // Loeb `Data` faili nimega `file`. Kui fail ei eksisteeri, tagastab `nil`. func readData(from file: String) -> Data? { let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! let fileURL = documentDirectoryURL.appendingPathComponent(file) return try? Data(contentsOf: fileURL) } final class DiskCache<T>: CacheProtocol { func setValue(_ value: T?, forKey key: String) { } func getValue(forKey key: String) -> T? { } func fetchValue(forKey key: String, completion: @escaping (T?) -> Void) { } }

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Selgitage vahemikus olevate vahemälu ja kõvakettal olevate vahemälude erinevust.

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Kuidas sa mõistad struktureeritud konkurentsi Swiftis? Kas Task.detached sobib sellele mõistele?

Miks te lõite eraldi load ja getLastCities meetodid ning mida peaks juhtuma, kui getLastCities kutsutakse enne andmete laadimist?

import UIKit protocol CacheProtocol { associatedtype Value func setValue(_ value: Value?, forKey key: String) func getValue(forKey key: String) -> Value? func fetchValue(forKey key: String, completion: @escaping (Value?) -> Void) } final class Cache<T>: CacheProtocol { private var storage: [String: T] = [:] private let queue = DispatchQueue(label: "my.queue", attributes: .concurrent) func setValue(_ value: T?, forKey key: String) { queue.sync(flags: .barrier) { storage[key] = value } } func getValue(forKey key: String) -> T? { queue.sync { return storage[key] } } func fetchValue(forKey key: String, completion: @escaping (T?) -> Void) { queue.async { let value = self.storage[key] completion(value) } } }

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Kuidas sa panustaksite tuvastatud probleemidele, kui projekt peab minema tootmisse ühe tunni jooksul?

Miks kasutada final klassi asemel klassi vahemälu rakendamiseks?

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// Teenus, mis saadab päringuid (get/post), url, päringu koostamine semantika järgi (decode/encode)

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enum HTTPMethod: String { case post = "POST" } enum Errors: Error { case invalidUrl case invalidQuery case invalidResponse case httpStatus(Int) } protocol MyDecoder { func decode<T: Decodable>(_: _ type: T.Type, from data: Data) throws -> T } final class NetworkService { private let session: URLSession private let encoder = JSONEncoder() private let decoder: MyDecoder init( session: URLSession = .shared, decoder: MyDecoder ) { self.session = session self.decoder = decoder } func request<Response: Decodable, Body: Encodable>( urlString: String, method: HTTPMethod, body: Body? = nil, headers: [String: String] = [:], query: [String: String] = [:] ) async throws -> Response { guard var components = URLComponents(string: urlString) else { throw Errors.invalidUrl } if !query.isEmpty { components.queryItems = query.map { URLQueryItem(name: $0.key, value: $0.value) } } guard let url = components.url else { throw Errors.invalidQuery } var request = URLRequest(url: url)

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