标签的持续时间

Question

我查看了此处与获取持续时间有关的所有代码。我需要做的就是简单地以这种格式 hr:m:s 像 20:23:04 这样的标签中的时间为例。我需要从 currentTime.StringValue 和 oldTime.StringValue 中获取时间，然后让它显示 durationOfTime.StringValue 中的持续时间。

例如说 currentTime = 11:00:04 和 oldTime = 9:00:04 那么我想要 durationOfTime = 2hr's.

现在就是这样，我有一个代码可以获取时间并以上述格式存储它。然而，我运行遇到了各种各样的问题，在这里尝试不同的代码，这些代码与持续时间有关。

Answer 1

使用 2 个格式化程序：DateFormatter 将字符串转换为 Date 对象，DateComponentFormatter 显示 2 个 Date 之间的持续时间：

let currentTimeStr = "11:00:04"
let oldTimeStr = "9:00:04"

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "H:mm:ss"

let dateComponentFormatter = DateComponentsFormatter()
dateComponentFormatter.allowedUnits = [.hour, .minute]
dateComponentFormatter.unitsStyle = .short

if let currentTime = dateFormatter.date(from: currentTimeStr),
    let oldTime = dateFormatter.date(from: oldTimeStr),
    let durationStr = dateComponentFormatter.string(from: oldTime, to: currentTime)
{
    print(durationStr) // 2 hrs
}

Answer 2

希望这对您有所帮助。编辑了 maddy 的建议。

    let currentTime = "11:00:04"
    let oldTime = "9:00:04"

    let currentTimeComponents = currentTime.components(separatedBy: ":")
    let oldTimeComponents = oldTime.components(separatedBy: ":")

    let hrsDifference = Int(currentTimeComponents[0])! - Int(oldTimeComponents[0])!
    let minutesDifference = Int(currentTimeComponents[1])! - Int(oldTimeComponents[1])!
    let secondsDifference = Int(currentTimeComponents[2])! - Int(oldTimeComponents[2])!

    print("hrsDifference = ",hrsDifference)
    print("minutesDifference = ",minutesDifference)
    print("secondsDifference = ",secondsDifference)

标签的持续时间

Time Duration From Labels

time

date

ios

swift

dateformatter