UIDatePicker Date Change Listener : Swift

Adding an editing event to a UIDatePicker is something that is required most of the time. For views like UIDatePicker, we can connect an IBAction with the event type as value changed and get a callback for the value changed.

If you are not using xib or storyboard but creating the layout programmatically or by using swiftUI, you can the editing event using a target action that takes three parameters,

  1. target of Any type which is nullable
  2. action of Selector type
  3. controlEvents of UIControl.Event

The code for the same will look like below.

Since the Selector takes only @objc functions which can only be defined as a member of the class or an extension of the class, we need to define it at a class level only.

This way is a bit inefficient as we need to add one function for each UIDatePicker where we need editing event.

There is a better way where we can add this functionality to each UIDatePicker without making our class messy.
We can add this to the UIDatePicker extension itself which will be a very clean approach and will make our life super easy.

First, add a function as an extension to UIDatePicker class which takes a function as a parameter with 0 params and Void return type.
Since this function will be our callback function, add @escaping to the function passed as the parameter.

Please continue reading at https://agrawalsuneet.github.io/blogs/uidatepicker-date-change-listener-swift/

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