Swift 将字符串转换为秒、分钟和小时

我有时间线

 duration = "00:01:28"

我想展示28秒，1分钟。如何以秒，分和小时的形式获得单独的组件

 let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "HH:mm:ss"
        let date = dateFormatter.date(from:duration)
        let calendar = Calendar.current
        let comp = calendar.dateComponents([.hour, .minute], from: date!)
        let hour = comp.hour
        let minute = comp.minute
        let sec = comp.second
        print(sec)
        print(minute)

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我尝试了这个代码，但在打印语句中得到了零。

几乎。当然，

sec

打印

nil

，因为您没有指定

second

组件

要打印请求的字符串格式，我建议使用

datecomponentsformter

let duration = "00:01:28"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm:ss"
let date = dateFormatter.date(from:duration)
let components = Calendar.current.dateComponents([.hour, .minute, .second], from: date!)
let componentsFormatter = DateComponentsFormatter()
componentsFormatter.allowedUnits = [.hour, .minute, .second]
componentsFormatter.unitsStyle = .short
componentsFormatter.string(from: components) // "1 min, 28 secs"