Compose中的定时器

/**
 * 定时器
 */
@Composable
fun time() {
    var timer : Timer? =null
    val sdf = SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
    timer = Timer()
    var number by remember {
        mutableStateOf(sdf.format(Date()))
    }
    LaunchedEffect(key1 = number , block = {
        timer!!.schedule(object : TimerTask() {
            override fun run() {
                // 时间
                number = sdf.format(Date())
            }
        }, 0, 1000)
    })
    Text(text = number)
}