带有 countDownTimer = 0 的 UIDatePicker 显示“0 小时 1 分钟”

Question

var interval = enddate.timeIntervalSince(startdate)
interval = 0 // even if I set it explicitly to zero, it still doesn't work
self.datepicker.datePickerMode = .countDownTimer
self.datepicker.countDownDuration = interval

startdate and enddate are the same date, so the interval=0 but just to double check I've set the interval=0 explicitly and it still doesn't work.

The UIDatePicker shows up in countDownTimer mode, but the ui elements are set to "0 hours, 1 min" instead of "0 hours, 0 min".

Why won't the date picker set to 0 mins to start?

Answer 1

The Countdown Timer Picker can't be set to 0 hours and 0 minutes. Think about it, will the user ever set a countdown for 0 time interval? It starts at 1 so that when the user starts the countdown there's always some amount of time to countdown to.

You can cross-check this in the system Clock app.