It was fine til suddenly i can't add action to UITextfield
on xcode, the view controller's class name on storyboard == the view controller's code, no problem on adding action to UIButton, but UITextField has no action option when ctrl dragging to code :((
I wonder what the hell happened
okay found the problem,
i used SwiftValidator and this: https://github.com/jpotts18/SwiftValidator/blob/43fddfb3851b8edc3b26ec0d49404fa445963483/SwiftValidator/Core/Validatable.swift
the extension somehow fucked XCode and i can't add IBAction for UITextFIeld on interface builder.
similar problem but on UIButton: Can't connect IBAction in Xcode