按日期排序自定义对象数组swift
问题描述:
我有一个自定义对象“会议”我正在添加数组中的所有对象。我想要做的是从Meeting.meetingDate中排序数组。按日期排序自定义对象数组swift
我也使用解析,我有两个查询,并把结果放入一个数组。
我可以将数据添加到“meetingData”,但不能对其进行排序。
任何人都可以帮忙吗?
所以我的数组是:
var meetingsData = [Meeting]()
会议类:
public class Meeting: PFObject, PFSubclassing
{
@NSManaged public var meetingTitle: String?
@NSManaged public var meetingLocation: String?
@NSManaged public var meetingNotes: String?
@NSManaged public var meetingDuration: String?
@NSManaged public var createdBy: User?
@NSManaged public var meetingTime: NSDate?
@NSManaged public var meetingDate: NSDate?
}
数组的内容就像这样:
<Meeting: 0x125edd040, objectId: xIqx7MoRd6, localId: (null)> {
createdBy = "<PFUser: 0x125d627c0, objectId: RKCWJRj84O>";
meetingDate = "2015-08-29 17:07:12 +0000";
meetingDuration = "2 hours 2 mins";
meetingLocation = 4th Floor;
meetingNotes = With Investors;
meetingTime = "2015-08-24 09:00:17 +0000";
meetingTitle = Meeting with Investors;
}
<Meeting: 0x125ed95f0, objectId: tz4xx5p9jB, localId: (null)> {
createdBy = "<PFUser: 0x125d627c0, objectId: RKCWJRj84O>";
meetingDate = "2015-08-23 23:00:00 +0000";
meetingDuration = "1 hour";
meetingLocation = "Emirates Stadium, London";
meetingNotes = "Football";
meetingTime = "2000-01-01 20:00:00 +0000";
meetingTitle = "Liverpool V Arsenal";
}
<Meeting: 0x125ed95f0, objectId: tz4xx5p9jB, localId: (null)> {
createdBy = "<PFUser: 0x125d627c0, objectId: RKCWJRj84O>";
meetingDate = "2015-09-23 23:00:00 +0000";
meetingDuration = "1 hour";
meetingLocation = "Library";
meetingNotes = "Dev Team";
meetingTime = "2000-01-01 10:00:00 +0000";
meetingTitle = "Code Review";
}
我试图做到这一点Swift how to sort array of custom objects by property value但它不起作用
在此先感谢
答
NSDate
不能与<
直接比较。您可以在下面的代码中使用的NSDate
compare
方法,如:
meetingsData.sort({ $0.meetingDate.compare($1.meetingDate) == .OrderedAscending })
在上面的代码,你可以更改使用NSComparisonResult
枚举排序的顺序,在斯威夫特像下面这样实现的:
enum NSComparisonResult : Int {
case OrderedAscending
case OrderedSame
case OrderedDescending
}
我希望这对你有所帮助。
答
对于夫特3
meetingsData.sort(by: { $0.meetingDate.compare($1.meetingDate) == .orderedAscending})
OR
作为日期现在在夫特3直接可比的,例如。
let firstDate = Date()
let secondDate = Date()
if firstDate < secondDate {
} else if firstDate == secondDate {
} else if firstDate > secondDate {
}
+0
谢谢,Ramkrishna。看起来语法已经更新了一些,因为你的帖子... meetingsData.sorted(通过:{$ 0.meetingDate.compare($ 1.meetingDate)== .orderedAscending}) – rockiesGrizzly
谢谢..我'使用'sortInPlace'的可变性 – jose920405