比较没有日期的时间swift3 [英] comparing time without date swift3

问题描述

我正在使用API​​来获取时间列表，该时间每天是（AM，PM）格式的字符串的五次，没有日期，

I am using an API to get a list of times which is five times a day as string in (AM,PM) format without date,

（ 4 ：30 AM， 1:00 PM， 3:20：PM， 6:40 PM， 9:10 PM）

("4:30 AM","1:00 PM","3:20: PM","6:40 PM","9:10 PM")

什么我想做的是显示屏幕上的下一次时间取决于iPhone上的当前时间

what I am trying to do is to show the next time in the screen depends on the current time on the iPhone

因此，如果现在的时间是下午5:00，则该时间应为屏幕上显示的时间是下午6:40

so if the time now is 5:00 PM the time should display on the screen is 6:40 PM

我如何快速比较时间而不包括日期，因为我试图将必须具有时间类型的时间列表转换为日期类型，但是不幸的是，日期和日期显示在2001年，所以即使我尝试比较日期也会给我错误的结果

how can I compare times in swift without including the dates because I tried to convert the list of times I have to Date type but unfortunately am getting dates and the dates shows in 2001 so even if I try to compare the date would give me wrong result

 print(self._praytime.arraytime)




            for Dates in self._praytime.arraytime {
                let dateformatters = DateFormatter()
                dateformatters.dateStyle = .none
                dateformatters.timeStyle = .short
                let xxbbs = dateformatters.date(from: Dates)
                print(xxbbs!)
            }

在获得时间后将其放入Array中，并尝试执行上面的代码，这样我可以得到没有日期的时间，但是输出屏幕上显示的是这个

after I got the times I put it in Array and I tried to execute the code upper so I can get the times without the date but what shows in the output screen was this

Optional(2000-01-01 11:14:00 +0000)
Optional(2000-01-01 20:06:00 +0000)
Optional(1999-12-31 23:57:00 +0000)
Optional(2000-01-01 03:11:00 +0000)
Optional(2000-01-01 04:41:00 +0000)

任何想法如何解决此问题以及是否有其他简便方法做这个任务，我很高兴听到它

any idea how to solve this problem and if is there any other easy way to do this task I'm exciting to hear it

谢谢大家

推荐答案

使用 DateComponents

• p>
  
  

• Assuming this given array

let times = ["4:30 AM","1:00 PM","3:20 PM","6:40 PM","9:10 PM"]

创建日期格式r匹配格式

Create a date formatter matching the format

let formatter = DateFormatter()
formatter.dateFormat = "h:mm a"

将时间字符串映射到 Date 并立即考虑小时和分钟 DateComponents >

Map the time strings to Date and immediately to DateComponents considering only hour and minute

let dateArray = times.map { Calendar.current.dateComponents([.hour, .minute], from:formatter.date(from:$0)!) }

将此数组映射到下一个日期，从现在开始分别匹配组件

Map this array to the next date from now matching the components respectively

let upcomingDates = dateArray.map { Calendar.current.nextDate(after: Date(), matching: $0, matchingPolicy: .nextTime)!  }

将数组升序排列，第一项是您要查找的日期

Sort the array ascending, the first item is the date you are looking for

let nextDate = upcomingDates.sorted().first!

使用格式化程序将日期转换回时间字符串

Use the formatter to convert the date back to a time string

print(formatter.string(from:nextDate))

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