IOS Swift Relam的简单使用

添加库

pod 'Realm'
pod 'RealmSwift'

配置数据信息

在AppDelegate的application,didFinishLaunchingWithOptions方法中添加以下方法configRealm()

fileprivate func configRealm() {
        // 如果要存储的数据模型属性发生变化,需要配置当前版本号比之前大
        let dbVersion : UInt64 = 4
        let docPath = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)[0] as String
        let dbPath = docPath.appending("/defaultDB.realm")

        let config = Realm.Configuration(fileURL: URL.init(string: dbPath), inMemoryIdentifier: nil, syncConfiguration: nil, encryptionKey: nil, readOnly: false, schemaVersion: dbVersion, migrationBlock: { (migration, oldSchemaVersion) in
            
        }, deleteRealmIfMigrationNeeded: false, shouldCompactOnLaunch: nil, objectTypes: nil)
        Realm.Configuration.defaultConfiguration = config
        Realm.asyncOpen { (realm, error) in
            if let _ = realm {
//                print("Realm 服务器配置成功!")
            }else if let error = error {
                print("Realm 数据库配置失败：\(error.localizedDescription)")
            }
        }
    }

使用

新建一个模型

class PVCount: Object {
    @objc dynamic var id = 0
    @objc dynamic var count = 0
    @objc dynamic var time = 0
    
    override static func indexedProperties() -> [String] {
        return ["id"]
    }
 }

添加

 let realm = try! Realm()
        try! realm.write {
            let pvCount = PVCount(value: ["id" : model.news_id, "count": 1, "time": 1])
                 realm.add(pvCount)
        }

删除

  let realm = try! Realm()
        try! realm.write {
            let pvs = realm.objects(PVCount.self)
            realm.delete(pvs)
        }

查询

  let realm = try! Realm()
        try! realm.write {
            let pvs = realm.objects(PVCount.self)//查询所有
            let pvCounts = realm.objects(PVCount.self).filter("id = %@", model.news_id)//根据 id 查询
            //let predicate = NSPredicate(format: "id < 5 AND count > 10)//复合查询
            //let predicate = NSPredicate(format: "id < 5 AND name BEGINSWITH '张'")
        }

修改

let realm = try! Realm()
        try! realm.write {
            let pvCounts = realm.objects(PVCount.self).filter("id = %@", model.news_id)
            let pv = pvCounts.first
            //let pvCount = pvCounts[0]
            pvCount.count = pvCount.count+1
        }

以上就是Realm数据在 swift 中的基本操作(增删查改),希望对您有所帮助