如何在 Swift3 中以秒为单位将字符串更改为分钟？

Question

您好，我正在获取字符串形式的时间值。我得到的数字以秒为单位。现在我想使用 swift3 将秒数转换为分钟数。

我得到的秒数是： 540 这是秒。

现在我想将秒数转换为分钟数。例如它应该显示为 09:00 .

如何使用 Swift3 代码实现此目的。目前我没有使用任何转换代码。

let duration: TimeInterval = 7200.0

let formatter = DateComponentsFormatter()
formatter.unitsStyle = .positional // Use the appropriate positioning for the current locale
formatter.allowedUnits = [ .hour, .minute, .second ] // Units to display in the formatted string
formatter.zeroFormattingBehavior = [ .pad ] // Pad with zeroes where appropriate for the locale

let formattedDuration = formatter.string(from: duration)

Answer 1

这是一种方法：

let duration: TimeInterval = 540

// new Date object of "now"
let date = Date()

// create Calendar object
let cal = Calendar(identifier: .gregorian)

// get 12 O'Clock am
let start = cal.startOfDay(for: date)

// add your duration
let newDate = start.addingTimeInterval(duration)

// create a DateFormatter
let formatter = DateFormatter()

// set the format to minutes:seconds (leading zero-padded)
formatter.dateFormat = "mm:ss"

let resultString = formatter.string(from: newDate)

// resultString is now "09:00"

// if you want hours
// set the format to hours:minutes:seconds (leading zero-padded)
formatter.dateFormat = "HH:mm:ss"

let resultString = formatter.string(from: newDate)

// resultString is now "00:09:00"

如果您希望将以秒为单位的持续时间格式化为 "time of day,"，请将格式字符串更改为：

formatter.dateFormat = "hh:mm:ss a"

现在，生成的字符串应该是：

"12:09:00 AM"

当然，这会因地区而异。

Answer 2

你可以使用这个：

func timeFormatter(_ seconds: Int32) -> String! {
    let h: Float32 = Float32(seconds / 3600)
    let m: Float32 = Float32((seconds % 3600) / 60)
    let s: Float32 = Float32(seconds % 60)
    var time = ""

    if h < 10 {
        time = time + "0" + String(Int(h)) + ":"
    } else {
        time = time + String(Int(h)) + ":"
    }
    if m < 10 {
        time = time + "0" + String(Int(m)) + ":"
    } else {
        time = time + String(Int(m)) + ":"
    }
    if s < 10 {
        time = time + "0" + String(Int(s))
    } else {
        time = time + String(Int(s))
    }

    return time
}

Answer 3

考虑使用 Swift Moment 框架：https://github.com/akosma/SwiftMoment

let duration: TimeInterval = 7200.0
let moment = Moment(duration)
let formattedDuration = "\(moment.minutes):\(moment.seconds)"

如何在 Swift3 中以秒为单位将字符串更改为分钟？

How to change the string in seconds to minutes in Swift3?

ios

swift3

xcode8.2