Question

我正在通过编码来尝试在swift3中两个日期之间的日子。不幸的是，我收到错误并且运行失败。请告诉我如何解决以及如何在swift3中获取两个日期之间的日历日。

static func getDaysList(_ startDate:String, endDate:String, interval:Int) -> [Date] {
    var dayRange = [Date]()
    let inter = TimeInterval(interval * 60 * 60)
    let ti:TimeInterval = inter
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = datetimeformat
    let dateTo = dateFormatter.date(from: endDate)

    var nextDate = dateFormatter.date(from: startDate)
    let endDate = dateTo!.addingTimeInterval(ti)
    var startTime = NSDate()

    while nextDate!.compare(endDate) == ComparisonResult.orderedAscending {
        startTime = nextDate! as NSDate
        dayRange.append(startTime as Date)
        nextDate = nextDate!.addingTimeInterval(ti)
        startTime = nextDate! as NSDate
    }

    return dayRange
}

致命错误：在解包可选值时意外发现nil

指向let endDate = dateTo!.addingTimeInterval(ti)

Answer 1

这里

 let dateTo = dateFormatter.date(from: endDate)

您的endDate可能是dateFormatter格式不正确的字符串。因此dateTo最终为nil并崩溃：

let endDate = dateTo!.addingTimeInterval(ti)

如何在swift3中获取两个日期之间的日历天数

1 个答案: