如何从iOS swift中的约会前1小时前获得？

问题描述：

我一直在研究，但我无法找到解决问题的确切方法。我一直试图从一个约会前1小时前得到。我怎样才能在swift中实现这一目标？

I have been researching, but I couldnt find exact solution for my problem. I have been trying to get 1 hour ago from a date. How can I achieve this in swift?

答

对于涉及NSDate的正确计算，它考虑了不同日历的所有边缘情况（例如在节省时间之间切换）你应该使用NSCalendar类：

For correct calculations involving NSDate that take into account all edge cases of different calendars (e.g. switching between day saving time) you should use NSCalendar class:

Swift 3 +

let earlyDate = Calendar.current.date(
  byAdding: .hour, 
  value: -1, 
  to: Date())

较旧

// Get the date that was 1hr before now
let earlyDate = NSCalendar.currentCalendar().dateByAddingUnit(
       .Hour,
       value: -1, 
       toDate: NSDate(),
       options: [])

如何从iOS swift中的约会前1小时前获得？

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