Question

我有TimeInterval我必须将其转换为String，以便可以将其添加到通过Dictionary从Apple Watch传递到iPhone的WatchConnectivity。

既然我拥有iPhone上的String，我需要将其重新设置为TimeInterval ，但我似乎无法弄明白

（我需要在显示锻炼期的持续时间的UILabel中显示。）

有什么想法吗？

例如

观看：

<00> 00:15:15（小时，分钟，秒）变成＆＃34; 915.012948989868＆＃34;

    let myDouble = computeDurationOfWorkout(withEvents: hkWorkout?.workoutEvents, startDate: hkWorkout?.startDate, endDate: hkWorkout?.endDate)
    let myDoubleString = String(myDouble)
    durationVariableString = myDoubleString

iPhone ：

需要转向＆＃34; 915.012948989868＆＃34;回到00:15:15

Answer 1

使用calendar.dateComponents，您可以将915转换为00:15:15

func stringFromTimeInterval (interval: String) -> String {
        let endingDate = Date()
        if let timeInterval = TimeInterval(interval) {
            let startingDate = endingDate.addingTimeInterval(-timeInterval)
            let calendar = Calendar.current

            var componentsNow = calendar.dateComponents([.hour, .minute, .second], from: startingDate, to: endingDate)
            if let hour = componentsNow.hour, let minute = componentsNow.minute, let seconds = componentsNow.second {
                return "\(hour):\(minute):\(seconds)"
            } else {
                return "00:00:00"
            }

        } else {
            return "00:00:00"
        }
    }

Answer 2

而不是将时间间隔转换为字符串，而是将其转换为可添加到字典中的NSNumber。 NSTimeInterval只是一个双精度数，因此您可以轻松地将它转换为双精度数。

let timeInterval: TimeInterval = 915.012948989868

let dict = ["TimeIneterval": NSNumber(value: timeInterval)]

if let extractedTimeInterval: TimeInterval = dict["TimeIneterval"] as? TimeInterval {

    print(extractedTimeInterval)
}

Answer 3

这可以作为TimeInterval的扩展来完成。此版本也正确处理分钟/秒＆lt; 10通过填充它们。

extension TimeInterval {
    var formatted: String {
        let endingDate = Date()
        let startingDate = endingDate.addingTimeInterval(-self)
        let calendar = Calendar.current

        var componentsNow = calendar.dateComponents([.hour, .minute, .second], from: startingDate, to: endingDate)
        if let hour = componentsNow.hour, let minute = componentsNow.minute, let seconds = componentsNow.second {
            return "\(String(format: "%02d", hour)):\(String(format: "%02d", minute)):\(String(format: "%02d", seconds))"
        } else {
            return "00:00:00"
        }
    }
}

并处理字符串 - ＆gt; TimeInterval转换内联。

TimeInterval(intervalAsString).formatted

将TimeInterval转换为String <del> String To Time Interval </del>

3 个答案: