Add delegate for custom button pressed

[alphamu]

Feature request, please add a delegate that is called on a custom button being clicked.
The delegate can be called with or without the need to value in the picker.

[allanrvj]

There's a workaround for this, at least on the ActionSheetDatePicker. Make a subclass of the ActionSheetDatePicker and override the method

- (void)customButtonPressed:(id)sender

You can put your custom code inside. In my case I added a property to the subclass, which is a block, similar to ActionDateDoneBlock, and I called the block inside customButtonPressed.

Hope this helps someone :)

[skywinder]

@allanrvj Yes, it's a good workaround. Thanks for the hint.

[skywinder]

Good news everyone! @velga is kindly implement this feature in #81
The new feature is available since 1.3