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这让我疯狂。Swift 3 - DateComponents以Label.Text有时显示“...”
我试图找出两次当前时间和最终将从服务器中抓取的设置时间的差异。
这是时间getTimeDifference()
函数暂时没有参数。
let formatter = DateFormatter()
let userCalender = Calendar.current;
let requestedComponent : Set<Calendar.Component> = [.month,.day,.hour,.minute,.second]
public func getTimeDifference() -> DateComponents
{
formatter.dateFormat = "MM/dd/yyyy hh:mm:ss a"
let _startTime = Date()
let _endTime = formatter.date(from: "12/05/2016 14:01:00 a")
let timeDifference = userCalender.dateComponents(requestedComponent, from: _startTime, to: _endTime!)
return timeDifference
}
这是我在我的HomepageViewController
@IBOutlet weak var labelHours: UILabel!
@IBOutlet weak var labelMinutes: UILabel!
@IBOutlet weak var labelSeconds: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateCountdown), userInfo: nil, repeats: true).fire()
// Do any additional setup after loading the view.
}
func updateCountdown() -> Void {
let time = Countdown().getTimeDifference()
labelHours.text = time.hour?.description
labelMinutes.text = time.minute?.description
labelSeconds.text = time.second?.description
}
当过我运行这段代码就可以正常工作了几秒钟完全没问题但是部分区间它将显示...
问号(?)产生图像ab OVE和去除(?)将所有的标签作为...
labelHours.text = time.hour?.description
labelMinutes.text = time.minute?.description
labelSeconds.text = time.second?.description
labelHours.text = time.hour.description
labelMinutes.text = time.minute.description
labelSeconds.text = time.second.description
每个UILabel是否有足够的宽度来存放两位数字? (例如“24”需要比“11”更多的宽度。) – OOPer