Custom Date Picker in Swift UIKit

Description

This is a custom date picker built in Swift UIKit. It is a simple date picker that allows you to select a date. It is built using a CollectionView and CollectionViewCell to display the days of the month and a PickerView to display the months and years.

In the custom DateService class, it makes all the calculations needed. It calculates the number of days in the month and the first day of the month, months and years for the PickerView according to the minimum and maximum dates.

You can set the minimum and maximum dates that can be selected. It also has a delegate method that returns the selected date. You can select a month and year and go to the next or previous month. You can also select a day and go to the next or previous month. The CollectionView is updated according to the selected month and year.