如何在iOS swift中从约会中获取1小时前的信息？
如何在iOS swift中从约会中获取1小时前的信息？
提问于 2014-12-02 22:19:23
我一直在研究，但我找不到解决我的问题的确切方法。我一直在试着从一个小时前的约会中得到。我如何在swift中实现这一点？
回答 14
Stack Overflow用户
回答已采纳
发布于 2014-12-02 22:30:26
对于涉及NSDate的正确计算，考虑到不同日历的所有边缘情况(例如，在夏令时之间切换)，您应该使用NSCalendar类：
Swift 3+
let earlyDate = Calendar.current.date(
byAdding: .hour,
value: -1,
to: Date())更老的
// Get the date that was 1hr before now
let earlyDate = NSCalendar.currentCalendar().dateByAddingUnit(
.Hour,
value: -1,
toDate: NSDate(),
options: [])Stack Overflow用户
发布于 2015-11-04 15:03:56
使用此方法并粘贴到您的帮助器类中。
针对Swift 3和Xcode 8.3进行了更新
class func timeAgoSinceDate(_ date:Date,currentDate:Date, numericDates:Bool) -> String {
let calendar = Calendar.current
let now = currentDate
let earliest = (now as NSDate).earlierDate(date)
let latest = (earliest == now) ? date : now
let components:DateComponents = (calendar as NSCalendar).components([NSCalendar.Unit.minute , NSCalendar.Unit.hour , NSCalendar.Unit.day , NSCalendar.Unit.weekOfYear , NSCalendar.Unit.month , NSCalendar.Unit.year , NSCalendar.Unit.second], from: earliest, to: latest, options: NSCalendar.Options())
if (components.year! >= 2) {
return "\(components.year!) years ago"
} else if (components.year! >= 1){
if (numericDates){
return "1 year ago"
} else {
return "Last year"
}
} else if (components.month! >= 2) {
return "\(components.month!) months ago"
} else if (components.month! >= 1){
if (numericDates){
return "1 month ago"
} else {
return "Last month"
}
} else if (components.weekOfYear! >= 2) {
return "\(components.weekOfYear!) weeks ago"
} else if (components.weekOfYear! >= 1){
if (numericDates){
return "1 week ago"
} else {
return "Last week"
}
} else if (components.day! >= 2) {
return "\(components.day!) days ago"
} else if (components.day! >= 1){
if (numericDates){
return "1 day ago"
} else {
return "Yesterday"
}
} else if (components.hour! >= 2) {
return "\(components.hour!) hours ago"
} else if (components.hour! >= 1){
if (numericDates){
return "1 hour ago"
} else {
return "An hour ago"
}
} else if (components.minute! >= 2) {
return "\(components.minute!) minutes ago"
} else if (components.minute! >= 1){
if (numericDates){
return "1 minute ago"
} else {
return "A minute ago"
}
} else if (components.second! >= 3) {
return "\(components.second!) seconds ago"
} else {
return "Just now"
}
}使用此方法：
var timeAgo:String=AppHelper.timeAgoSinceDate(date, numericDates: true)
Print("\(timeAgo)") // Ex- 1 hour agoStack Overflow用户
发布于 2014-12-02 22:23:43
请阅读NSDate类引用。
let oneHourAgo = NSDate.dateWithTimeIntervalSinceNow(-3600)应该这么做。
或者，对于任何NSDate 对象：
let oneHourBack = myDate.dateByAddingTimeInterval(-3600)Swift 4：
let oneHourAgo = NSDate(timeIntervalSinceNow: -3600)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/27251644
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