56 lines
1.8 KiB
Swift
56 lines
1.8 KiB
Swift
//
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// ScenicQueueQRCodeSaver.swift
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// suixinkan
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//
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import Foundation
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import Photos
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import UIKit
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/// 排队二维码保存服务。
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enum ScenicQueueQRCodeSaver {
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/// 下载二维码图片并保存到系统相册。
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static func saveImage(from urlString: String) async throws {
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guard let url = URL(string: urlString) else {
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throw ScenicQueueQRCodeSaverError.invalidURL
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}
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let (data, _) = try await URLSession.shared.data(from: url)
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guard let image = UIImage(data: data) else {
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throw ScenicQueueQRCodeSaverError.invalidImage
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}
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try await saveToPhotoLibrary(image)
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}
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private static func saveToPhotoLibrary(_ image: UIImage) async throws {
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let status = PHPhotoLibrary.authorizationStatus(for: .addOnly)
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if status == .notDetermined {
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_ = await PHPhotoLibrary.requestAuthorization(for: .addOnly)
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}
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guard PHPhotoLibrary.authorizationStatus(for: .addOnly) == .authorized
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|| PHPhotoLibrary.authorizationStatus(for: .addOnly) == .limited else {
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throw ScenicQueueQRCodeSaverError.denied
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}
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try await PHPhotoLibrary.shared().performChanges {
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PHAssetChangeRequest.creationRequestForAsset(from: image)
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}
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}
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}
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/// 排队二维码保存错误。
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enum ScenicQueueQRCodeSaverError: LocalizedError {
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case invalidURL
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case invalidImage
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case denied
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var errorDescription: String? {
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switch self {
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case .invalidURL:
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"服务端返回的二维码地址无效"
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case .invalidImage:
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"下载或保存二维码失败，请检查网络与存储权限"
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case .denied:
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"未授予权限，无法将小程序码保存到相册"
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}
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}
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}
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