如何将字符串解析为NSTimeInterval

How to parse string value like 12:02:21.3213 to NSTimeInterval? NSDateComponentsFormatter, available since iOS8, supports only formatting, not parsing.

如何将字符串值解析为12：02：21.3213到NSTimeInterval？自iOS8起可用的NSDateComponentsFormatter仅支持格式化，而不支持解析。

2 个解决方案

#1

Here is how you can do it in Swift:

以下是在Swift中如何做到这一点：

func parseDuration(timeString:String) -> NSTimeInterval {
    guard !timeString.isEmpty else {
        return 0
    }

    var interval:Double = 0

    let parts = timeString.componentsSeparatedByString(":")
    for (index, part) in parts.reverse().enumerate() {
        interval += (Double(part) ?? 0) * pow(Double(60), Double(index))
    }

    return interval
}

It works for values like 2:12:12, 02:01:23.123213

它适用于像2：12：12,02：01：23.123213这样的值

#2

The solution provided by Bartosz Hernas worked for me, thank you!

Bartosz Hernas提供的解决方案为我工作，谢谢！

For convenience, here it is for Swift 3:

为方便起见，这里是Swift 3：

func parseDuration(_ timeString:String) -> TimeInterval {
    guard !timeString.isEmpty else {
        return 0
    }

    var interval:Double = 0

    let parts = timeString.components(separatedBy: ":")
    for (index, part) in parts.reversed().enumerated() {
        interval += (Double(part) ?? 0) * pow(Double(60), Double(index))
    }

    return interval
}

#1