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How do I sort a swift array containing instances of NSManagedObject subclass by an attribute value (date) 5个
我有一个名为Event的模型类.
我有一个名为Event的模型类.
import Foundation
import MapKit
public class Event {
let id: Int
var title: String?
let status: String
let location: String
var description: String?
var latitude: CLLocationDegrees?
var longitude: CLLocationDegrees?
var startDate: NSDate?
var endDate: NSDate?
init(id: Int,location: String,status: String) {
self.id = id
self.location = location
self.status = status
}
}
我从Web API获取事件数据作为JSON响应.然后我通过解析JSON数据创建Event对象并将它们放入一个类型化的数组中(var events = [Event]()).
private func processEventData(data: JSON) {
var events = [Event]()
if let eventsArray = data.array {
for eventObj in eventsArray {
let event = Event(
id: eventObj["id"].int!,location: eventObj["location"].string!,status: eventObj["status"].string!
)
event.title = eventObj["title"].string
event.description = eventObj["description"].string
event.latitude = eventObj["lat"].double
event.longitude = eventObj["lng"].double
event.startDate = NSDate(string: eventObj["start"].string!)
event.endDate = NSDate(string: eventObj["end"].string!)
events.append(event)
}
}
}
接下来,我需要通过startDate属性值对此数组进行排序.我尝试使用像这样的新Swift标准库函数排序对数组进行排序.
var orderedEvents = events.sort({ $0.startDate! < $1.startDate! })
但奇怪的是我得到以下错误.
无法使用类型为'((_,_) – > _)’的参数列表调用’sort’
我不明白为什么我不能这样排序,因为我有一个类型化的数组.
知道我在这里做错了吗？
