仅按日期时间/日期选择器中的日期快速过滤 [英] Filter by date only from datetime/datepicker in swift

问题描述

我在表单中使用日期时间选择器，并将以下数据插入到核心数据实体(属性)

I am using datetime picker in form and inserting data as follows to core data entity (attribute)

   `appointment.date = appointmentDate.date //it is getting date as well and time
    appointment.title = "Appointment"
    do {
        try managedObjectContext.save()`

，并且在另一个viewcontroller中，我这样做是根据日期来过滤记录.我有一个返回日期的日历.

and in another viewcontroller i am doing this to filter records based on date. I have a calendar which returns date.

    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Appointment")
    let sortDescriptor = NSSortDescriptor(key: "date", ascending: true)
    fetchRequest.sortDescriptors = [sortDescriptor]
    let predicate = NSPredicate(format: "date = %@", calendar.selectedDate! as NSDate)
    fetchRequest.predicate = predicate  

尝试按日期过滤(忽略时间)，但不起作用(不显示任何内容).如果删除谓词，则显示所有记录.

Trying to filter just by the date (ignoring time) but it is not working(does not show anything).If I remove the predicate all records are displayed.

正确的方法是什么?我在哪里做错了?是格式问题吗?

What is the right way or where am i doing it wrong? Is it a format problem?

推荐答案

如果要过滤所选日中的记录，则必须应用带有开始日期和结束日期的谓词

If you want to filter the records which are in the selected day you have to apply a predicate with start and end date

let startDate = Calendar.current.startOfDay(for: calendar.selectedDate)
let endDate = Calendar.current.date(byAdding: .day, value: 1, to: startDate)
let predicate = NSPredicate(format: "date >= %@ AND date < %@", startDate as NSDate, endDate as NSDate)

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