iOSDate相关

public extension Date {
    //MARK: 根据规则返回对应的字符串
    func getTimeString() -> String {
        if isToday {
            if minute < 5 {
                return "刚刚"
            } else if hour < 1 {
                return "\(minute)分钟之前"
            } else {
                return "\(hour)小时之前"
            }
        } else if isYesterday {
            return "昨天 \(self.yesterdayTimeStr())"
        } else if isYear {
            return noYesterdayTimeStr()
        } else {
            return yearTimeStr()
        }
    }
    fileprivate var selfDate : Date {
        return self
    }
    /// 距当前有几分钟
    var minute : Int {
        let dateComponent = Calendar.current.dateComponents([.minute], from: selfDate, to: Date())
        return dateComponent.minute!
    }
    /// 距当前有几小时
    var hour : Int {
        let dateComponent = Calendar.current.dateComponents([.hour], from: selfDate, to: Date())
        return dateComponent.hour!
    }
    /// 是否是今天
    var isToday : Bool {
        return Calendar.current.isDateInToday(selfDate)
    }
    /// 是否是昨天
    var isYesterday : Bool {
        return Calendar.current.isDateInYesterday(selfDate)
    }
    /// 是否是今年
    var isYear: Bool {
        let nowComponent = Calendar.current.dateComponents([.year], from: Date())
        let component = Calendar.current.dateComponents([.year], from: selfDate)
        return (nowComponent.year == component.year)
    }
    func yesterdayTimeStr() -> String {
        let format = DateFormatter()
        format.dateFormat = "HH:mm"
        return format.string(from: selfDate)
    }
    func noYesterdayTimeStr() -> String {
        let format = DateFormatter()
        format.dateFormat = "MM-dd HH:mm"
        return format.string(from: selfDate)
    }
    func yearTimeStr() -> String {
        let format = DateFormatter()
        format.dateFormat = "yyyy-MM-dd HH:mm"
        return format.string(from: selfDate)
    }
}

func dateToString(date:Date) -> String{
    //定义一个日期格式
    let dateFormat = DateFormatter()
    //日期风格
    dateFormat.dateStyle = DateFormatter.Style.short
    //时间风格
    dateFormat.timeStyle = DateFormatter.Style.short
    //设置相对日期
    dateFormat.doesRelativeDateFormatting = true
    dateFormat.timeStyle = DateFormatter.Style.short
    //日期的地区为中国
    dateFormat.locale = Locale(identifier: "zh_cn")
    let dateStr = dateFormat.string(from: date)
    return dateStr
}

//与otherDate比较，相同返回YES
now.isEqualToDate(tomorrow)
//与anotherDate比较，返回较早的那个日期
now.earlierDate(tomorrow)
//与anotherDate比较，返回较晚的那个日期
now.laterDate(tomorrow)