我的代码如下:
func stringFromTimeInterval(interval:NSTimeInterval) -> NSString {
var ti = NSInteger(interval)
var ms = ti * 1000
var seconds = ti % 60
var minutes = (ti / 60) % 60
var hours = (ti / 3600)
return NSString(format: "%0.2d:%0.2d:%0.2d",hours,minutes,seconds,ms)
}
在输出中，毫秒给出错误的结果.请说明如何正确查找毫秒.
Swift支持浮点数的余数计算，所以我们可以使用% 1.
var ms = Int((interval % 1) * 1000)
如下所示:
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"
Swift 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)
}
}
使用:
self.timeLabel.text = player.duration.stringFromTimeInterval()