UITextfield's size change when enter large text

Hi,
In my app I have multiple textFields. When I enter small text than it will work fine, but when large text is entered than UITextField size changed.

Without Text:

       
                                                                                                       
With Small Text:






With Larger Text:   The textfield size also increased with respect to text .

I tried this one for overcoming the issue. but i don't have any change while using this one.

[yourTextField setAdjustsFontSizeToFitWidth:FALSE];