Swift:解析，基于nsdate()查询日期字段 [英] Swift : Parse, query date field based on nsdate()

问题描述

我正在尝试检索今天添加的要分析的记录，但是查询不返回任何结果.我如何获取查询以根据今天的日期返回结果.

i am trying to retrieve records which were added today to parse, but the query does not return any results. how can i get the query to return the results based on todays date.

let now = NSDate()
var query = PFQuery(className:"userBids")
    query.whereKey("date", equalTo: now)

解析日期字段设置为日期.请帮助

the parse date field is set to date. please help

推荐答案

您的问题是NSDate不仅是日期，而是确切的时间.

Your problem is that NSDate is not just a date, it's an exact moment in time.

并且您很可能在这个确切的日期和时间中完全没有没有记录.

And you're very likely to have exactly no records from this precise date and moment in time.

您应该做的事情是这样的:

What you should be doing is something like:

let now = NSDate()
let cal = NSCalendar(calendarIdentifier: NSGregorianCalendar)
let midnightOfToday = cal.startOfDayForDate(now)
var query = PFQuery(className:"userBids")
    query.whereKey("date", greaterThanOrEqualTo: midnightOfToday)

上述解决方案仅适用于iOS 8和更高版本；较新(，我在这里找到了它).如果您想获得与iOS 7兼容的内容，请单击该链接.

The above solution only works for iOS 8 & newer (and I found it here). Click on that link if you want to get something that's iOS 7 compatible.

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