在iOS开发中，可以使用以下代码示例来实现本地保存数据：

1. 使用UserDefaults保存简单的键值对数据：

// 保存数据
UserDefaults.standard.set("Hello, World!", forKey: "message")

// 读取数据
if let message = UserDefaults.standard.string(forKey: "message") {
    print(message)
}

2. 使用NSKeyedArchiver和NSKeyedUnarchiver保存和读取自定义对象：

// 自定义对象需要遵循NSCoding协议
class Person: NSObject, NSCoding {
    var name: String
    var age: Int
    
    init(name: String, age: Int) {
        self.name = name
        self.age = age
    }
    
    required convenience init?(coder aDecoder: NSCoder) {
        guard let name = aDecoder.decodeObject(forKey: "name") as? String else {
            return nil
        }
        
        let age = aDecoder.decodeInteger(forKey: "age")
        self.init(name: name, age: age)
    }
    
    func encode(with aCoder: NSCoder) {
        aCoder.encode(name, forKey: "name")
        aCoder.encode(age, forKey: "age")
    }
}

// 保存数据
let person = Person(name: "Alice", age: 25)
let data = NSKeyedArchiver.archivedData(withRootObject: person)
UserDefaults.standard.set(data, forKey: "person")

// 读取数据
if let savedData = UserDefaults.standard.data(forKey: "person"),
   let savedPerson = NSKeyedUnarchiver.unarchiveObject(with: savedData) as? Person {
    print(savedPerson.name)
    print(savedPerson.age)
}

3. 使用Core Data保存和读取数据：

import CoreData

// 自定义Core Data实体对象
class User: NSManagedObject {
    @NSManaged var name: String
    @NSManaged var age: Int
}

// 保存数据
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext

let user = User(context: context)
user.name = "Alice"
user.age = 25

do {
    try context.save()
} catch let error as NSError {
    print("Could not save data: \(error), \(error.userInfo)")
}

// 读取数据
let fetchRequest: NSFetchRequest = User.fetchRequest()
do {
    let users = try context.fetch(fetchRequest)
    for user in users {
        print(user.name)
        print(user.age)
    }
} catch let error as NSError {
    print("Could not fetch data: \(error), \(error.userInfo)")
}

以上是几种常见的在iOS中实现本地保存数据的方法，具体选择哪种方法取决于你的需求和数据类型。