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

可紊 提交于 2019-11-30 02:07:22

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;
}

When sending input from your custom input view back to the textfield, note that you can (should) use the UIKeyInput protocol methods that UITextField conforms to. Namely:

- (void)deleteBackward;
- (void)insertText:(NSString *)text;
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