Swift - 显示时间的更新/刷新标签 [英] Swift - Update/Refresh Label that Displays Time

问题描述

我有一个标签，以12小时格式显示当前时间。

I have a label which displays the current time in 12-hour format.

但是，每次分钟/小时更改时，它都不会更新/刷新时间。

But, it does not update/refresh the time every time the minute/hour changes.

我需要它在时间变化时自动将标签更改为当前时间。

I need it to automatically change the label to the current time when the time changes.

推荐答案

Swift 3解决方案

Swift 3 Solution

class ViewController {

@IBOutlet weak var timeLabel: UILabel!
var timer: NSTimer?

let formatter: DateFormatter = {
       let tmpFormatter = DateFormatter()
       tmpFormatter.dateFormat = "hh:mm a"
       return tmpFormatter
     }()

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view, typically from a nib.


  timer = Timer.scheduledTimer(timeInterval: 60, target: self, selector: #selector(self.getTimeOfDate), userInfo: nil, repeats: true)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    timer?.invalidate()
  }

func getTimeOfDate() {
   var curDate = Date()

   timeLabel.text = formatter.string(from: curDate)

}

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