Custom inputView for UITextField , how do I direct input back to the text field?

cocoa-touch, first-responder, inputview, ios, uitextfield

Solution

How does the system keyboard get a reference to the UITextfield that is the first responder?

It just asks the system for the first responder; unfortunately, that's a private UIKit method (or was, last I checked). You can find the first responder by recursing through the view hierarchy and asking each view, but that's pretty clumsy.

Instead, you can add a link to the text field on the input view (I'm assuming your input view is a custom UIView subclass):

@property(nonatomic, assign) UITextField* target;

Then use the UITextField delegate methods in your view controller to see when the text field is being focused:

- (void)textFieldDidBeginEditing:(UITextField*)textField
{
    if ( [textField.inputView isKindOfClass:[MyInputView class]] )
        ((MyInputView*)textField.inputView).target = textField;
}

- (void)textFieldDidEndEditing:(UITextField*)textField
{
    if ( [textField.inputView isKindOfClass:[MyInputView class]] )
        ((MyInputView*)textField.inputView).target = nil;
}

Problem

I have set a custom `inputView` to my `UITextField`. I need a way to display the data selected in my custom `inputView` in the `UITextfield`. I would like to achieve this the same way the system keyboard does it. Does anyone know how this is done? How does the system keyboard get a reference to the `UITextfield` that is the first responder?

Original source