Iphone 核心数据：日期默认值作为当前日期

iPhone核心数据：日期默认值作为当前日期

swift
import CoreData
// 创建一个实体类
class Event: NSManagedObject {
    @NSManaged var name: String
    @NSManaged var date: Date
}
// 获取当前日期
let currentDate = Date()
// 创建一个新的事件
let newEvent = Event(context: context)
newEvent.name = "Birthday Party"
newEvent.date = currentDate
// 保存更改
do {
    try context.save()
} catch {
    print("保存失败：\(error)")
}
// 查询所有事件并打印
let request: NSFetchRequest = Event.fetchRequest()
do {
    let events = try context.fetch(request)
    for event in events {
        print("事件名：\(event.name)，日期：\(event.date)")
    }
} catch {
    print("查询失败：\(error)")
}