iOS

protokol SomeProtocol { func test() } func test1_1(qiymat: SomeProtocol) {} func test1_2(qiymat: any SomeProtocol) {} func test2_1(qiymat: some SomeProtocol) {} func test2_2<Qiymat: SomeProtocol>(qiymat: Qiymat) {} class A { func test2_2<Qiymat: SomeProtocol>(qiymat: Qiymat) { } } class B: SomeProtocol { func test() {} } class C: B {} A().test2_2(qiymat: B())

So'nggi WWDCda qiziqarli sessiyalar yoki freymvorklar bo'ldimi va ularni ishda sinab ko'rishni xohlaysizmi?

oxirgi sinf 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) } } oxirgi sinf 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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Xotira ichidagi kesh bilan diskda saqlangan kesh o'rtasidagi farqni tushuntiring.

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Yangi ekran yoki yangi funksiyani amalga oshirayotganingizda, darhol SwiftUI da yozasizmi, yoki UIKit va SwiftUI o'rtasida tanlov bo'yicha muhokamalar bo'ladimi?

Loyihada ishlatgan foydali Property Wrapper'lar haqida gapir

protokol 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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// `data`ni `file` nomli faylga yozadi. 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) } // `file` nomli faylni o‘chiradi. 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) } // `file` nomli fayldan `Data` o‘qiydi. Fayl mavjud bo‘lmasa, `nil` qaytaradi. 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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Loyihada SwiftUI dan foydalanish haqida gapir — siyosat nima, nechta ekran SwiftUI da yozilgan

Agar loyiha bir soat ichida ishlab chiqarishga chiqishi kerak bo'lsa, aniqlangan muammolarni qanday ustuvorlik bilan belgilaysiz?

import UIKit protokol 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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Nima uchun siz alohida load va getLastCities metodlarini yaratdingiz va agar getLastCities ma'lumotlar yuklanishidan oldin chaqirilsa, nima bo'lishi kerak?

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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Swiftda tuzilgan hamkorlik terminini qanday tushunasiz? Task.detached bu tushunchaga mos keladimi?

Keshni amalga oshirish uchun nima uchun final sinfdan foydalaniladi, sinf o'rniga?

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// So'rovlarni yuboradigan xizmat (get/post), url, semantikaga qarab so'rovni shakllantirish (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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