Label Picker

Example project where we make a label show/hide a UIPickerView on each tap.

The basic gist is:

• Create a UILabel on the storyboard
• Subclass UILabel & make the label use that class
• Override two properties to make sure the label receives the tap & can become the first responder
  • canBecomeFirstResponder
  • isUserInteractionEnabled (This should be settable from Storyboard)
• Make UILabelSubclass.inputView property settable & assign something like UIPickerView to it
• Listen for touchesEnded(_:with:) & call becomeFirstResponder when it receives a tap.
  • As we want to show/hide then we check if we're already first responder and resign if we are in this case

Screen recording?

Pretty boring, but sure, why not.

How did you figure this out?!

Little bit of reading the docs, little bit of googling and a lot of time trying various things. Understanding first responder is essential, and the magic key that I was missing? The default first responder for UIView presenting whatever is in UIView.inputView.

Useful links in no particular order:

• https://github.com/pietrorea/PRLabel/blob/master/Classes/PRLabel.m
• https://developer.apple.com/library/content/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/ManageTextFieldTextViews/ManageTextFieldTextViews.html
• http://stephengroom.co.uk/uikit/showing-ios-keyboard-without-text-input/
• https://stackoverflow.com/questions/12849146/uilabel-doesnt-show-inputview/23297991#23297991

License

See LICENSE, tldr; Apache 2.0