49 lines
1.4 KiB
Swift
49 lines
1.4 KiB
Swift
//
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// MPCoreDataHandlerManager.swift
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// MusicPlayer
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//
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// Created by Mr.Zhou on 2024/4/1.
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//
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import Foundation
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import CoreData
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///CoreData数据库处理器
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class MPCoreDataHandlerManager {
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//单例工具
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static let shared = MPCoreDataHandlerManager()
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//数据仓库
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private lazy var persistentContainer: NSPersistentContainer = {
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//数据仓库名为XXX.cdatamodeld中的XXX
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let container = NSPersistentContainer(name: "MusicPlayer")
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container.loadPersistentStores { (_, error) in
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if let error = error {
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//加载数据仓库失败
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fatalError("Failed to load persistent stores: \(error)")
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}else {
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//加载数据仓库成功
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print("Successfully to load persistent stores")
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}
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}
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return container
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}()
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//托管（映射）对象空间
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var context: NSManagedObjectContext {
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return persistentContainer.viewContext
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}
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//保存对象空间
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func saveContext() {
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//检索对象空间是否进行了更新
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if context.hasChanges {
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do {
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//保存对象空间
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try context.save()
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} catch {
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//保存失败
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let nserror = error as NSError
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fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
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}
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}
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}
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}
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