Swift支持对浮点数进行余数计算，因此我们可以使用% 1。
var ms = Int((interval % 1) * 1000)
如：
func stringFromTimeInterval(interval: TimeInterval) -> NSString {
let ti = NSInteger(interval)
let ms = Int((interval % 1) * 1000)
let seconds = ti % 60
let minutes = (ti / 60) % 60
let hours = (ti / 3600)
return NSString(format: "%0.2d:%0.2d:%0.2d.%0.3d",hours,minutes,seconds,ms)
}
结果：
stringFromTimeInterval(12345.67) "03:25:45.670"
斯威夫特4：
extension TimeInterval{
func stringFromTimeInterval() -> String {
let time = NSInteger(self)
let ms = Int((self.truncatingRemainder(dividingBy: 1)) * 1000)
let seconds = time % 60
let minutes = (time / 60) % 60
let hours = (time / 3600)
return String(format: "%0.2d:%0.2d:%0.2d.%0.3d",hours,minutes,seconds,ms)
}
}
用：
self.timeLabel.text = player.duration.stringFromTimeInterval()
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