Swift - scheduledTimer秒表小时数部分不工作

var startTime = Date()

var timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { timer in
    let currentTime = Date()
    let elapsedTime = currentTime.timeIntervalSince(startTime)
    // 更新秒表显示的时间
    // 可以使用格式化字符串来将时间转换为小时、分钟、秒的形式
}

let calendar = Calendar.current
let components = calendar.dateComponents([.hour, .minute, .second], from: elapsedTime)
let hour = components.hour ?? 0
let minute = components.minute ?? 0
let second = components.second ?? 0
// 更新UI显示，例如将时间显示在Label上