如何解决“没有更多上下文的歧义表达类型"?在 swift 3.0 [英] how to resolve “Type of expression in ambiguous without more context”? in swift 3.0

问题描述

func setTimeLeft() { let timeNow = NSDate() {

    if timeEnd.compare(timeNow as Date) == ComparisonResult.orderedDescending {
        let calendar = NSCalendar.current
        let components = calendar.components([.day , .hour , .minute , .second]  , fromDate: timeNow, toDate: timeEnd, options: [])

        var dayText = String(components.day) + "d "
        var hourText = String(components.hour) + "h "

        // Hide day and hour if they are zero
        if components.day <= 0 {
            dayText = ""
            if components.hour <= 0 {
                hourText = ""
            }
        }
        timeLeftLabel.text = dayText + hourText + String(components.minute) + "m " + String(components.second) + "s"

    } else {
        timeLeftLabel.text = "Ended"
    }
}

我是新手，我只是坚持这个错误行错误

i'm newbie and i just stuck at this error error at line

let components = calendar.components([.day , .hour , .minute , .second]  , fromDate: timeNow, toDate: timeEnd, options: [])

推荐答案

使用 Calendar 而不是 NSCalendar 因为 NSCalendar.current 也会给 Calendar 实例然后得到 DateComponents 使用 dateComponents(_:from:to:) 方法从日历中提取.

Use Calendar instead of NSCalendar because NSCalendar.current will also give Calendar instance and then get DateComponents from calendar using dateComponents(_:from:to:) method.

let calendar = Calendar.current
let components = calendar.dateComponents([.day , .hour , .minute , .second], from: timeNow, to: timeEnd)

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