Setting Textbox Value with Button (iPhone SDK)

What code would I use if I wanted to use a button to add a point (.) into a any selected textbox which already has a value in it. I can easily do this;

textField.text = @".";

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But this only works with one text box and clears the value.

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textField doesn't mean any text field it is only connected to one.

If you have many variables referencing the text fields you have. just loop (using a for loop) through them and check for the one whose editing property is set to YES.

If you want to add a fullstop to the end of the text field's text use:

textField.text = [NSString stringByAppendingString:@"."];