UISegment Control - 根据天选择设置 (SWIFT)

Question

Like the title says, I'm trying to set the selected segment control according to day. My segment control includes the days of the week and i also have a date and time label. The proper day has to be selected when the view is open

I know i have to do something with:

segmentControl.selectedSegmentIndex = 0

I'm getting the date with:

showDate.text = "Date:  " + DateFormatter.localizedString(from: Date(), dateStyle: DateFormatter.Style.medium, timeStyle: .none)

But I'm not sure how to set the selectedIndex to be dependent on date and show the appropriate day. I'm still new to swift and still learning, any help will be very much appreciated! Thanks

Answer 1

UISegmentedControl indexes start from 0. If you have all the days of the week in it its indexes start from 0 and end in 6.

You can get a day's index in weekdays using this

let day = Calendar.current.component(.weekday, from: Date())

this returns 1 for Sunday, 2 for Monday... 7 for Saturday

So you can assign selectedSegmentIndex as follows

    if (2...6).contains(day) {
        segmentControl.selectedSegmentIndex = day-2
    } else {
        segmentControl.selectedSegmentIndex = UISegmentedControlNoSegment
    }