iOS版Menampilkan Waktu Secara实时

[Artikel di edit lagi kapan-kapan]

帕凯Timer

  var timer = Timer() 

buat属性ti dateFormatter自然属性视图DidLoad

  dateFormatter = DateFormatter() 
dateFormatter?.dateStyle = .medium
dateFormatter?.timeStyle = .medium
dateFormatter?.dateFormat =“ hh-mm-ss a”

PERHATIKAN dateFormat“ hh — mm — ss a”

viewDidLoad()

 覆盖viewDidLoad(){ 
timer = Timer.scheduledTimer(timeInterval:1,target:self,选择器:#selector(printDateRealTime),userInfo:nil,重复:true)
}

printDateRealTime()

 让一个= dateFormatter?.string(from:Date()) 
 打印(一个!) 

塔拉!