ios - Swift:在尝试获取 NSDate future 日期时获取 EXC_BAD_INSTRUCTION

Question

我编写了一个函数来根据今天的日期获取下周一的 NSDate，但是当我尝试调用该函数时出现了一个运行时错误。

我收到一条错误消息:

线程 1:EXC_BAD_INSTRUCTION(代码=EXC_I386_INVOP，子代码=0x0)

在这一行:

calendar?.locale = NSLocale.currentLocale()

为什么会这样？？我需要采取哪些步骤来解决这个问题？

func getNextMonday() -> NSDate {
    let today = NSDate()
    var calendar = NSCalendar(calendarIdentifier: NSGregorianCalendar)
    calendar!.locale = NSLocale.currentLocale()

    let components = calendar!.components(.YearCalendarUnit | .WeekOfYearCalendarUnit | .HourCalendarUnit | .MinuteCalendarUnit | .SecondCalendarUnit, fromDate: today)
    components.weekday = 2
    components.weekOfYear = components.weekOfYear + 1
    components.hour = 8
    components.minute = 0
    components.second = 0

    if let nextMonday = calendar?.dateFromComponents(components) {
        return nextMonday
    }
    else {
        return today
    }
}

Answer 1

尝试展开可选的 calendar:

calendar!.locale = NSLocale.currentLocale()