Question

在我的旧代码中，我有一个名为“daysFrom”的Date扩展名，我似乎无法迁移到Swift 3：

func daysFrom(_ date:Date) -> Int{
    //Swift 2: 
    //return Calendar.current.date(.firstWeekday, from: date, to: self, options: []).day

    //My Swift 3 attempt, doesn't work:
    return Calendar.current.date([.firstWeekday], from: date, to: self).day
}

我发现this Swift线程说：

...... Swift 2中的NSCalendarUnit和Swift 3中的Calendar.Component都不包含第一周的组件......

那么如何替换此扩展名？

Answer 1

要获得两个日期之间的天数，请使用dateComponents：

extension Date {
    func days(from date: Date) -> Int {
        return Calendar.current.dateComponents([.day], from: date, to: self).day!
    }
}

然后

let days = endDate.days(from: startDate)

Swift 3 Date Extension：让'daysFrom'成为约会对象

1 个答案: