How i disable the alpha, alpha numeric and special character in UITextField?
<p>Thanks in advanced.
I want to disable or also i have does not give permission entering the alpha, alpha numeric and special character in UITextField i mean when user enter the alpha and special character in text box then i want to quickly message box pop-up to showing him u only have use 0,1-9 digit. 
Please give me any source code and tutorials on it. </p>
