在委托方法中使用默认行为对UITextField进行子类化的设计方法

I have subclassed the UITextField class so I can provide some built-in functionality for my application. I've changed the appearance to provide only an underline border for the UX design. Also, I want to use this control in situations where there is a picker (pick list, date / time picker). In these cases, I want to prevent editing BUT I still need to respond to touch events. To do this, I've added inspectable properties to control it from IB.I have subclassed the UITextField class so I ca