UITextfield check if its a number

Posted by Jacob on Stack Overflow See other posts from Stack Overflow or by Jacob
Published on 2010-03-31T23:52:54Z Indexed on 2010/04/01 0:03 UTC
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cocoa

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xcode

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objective-c

Hi,

How can I check if a user enters a number in my UITextField. Basically its a mark im accepting between 0-100 and it can be a decimal....I heard i can try to convert it to a NSNumber type and see if it returns null.

Not suree Any help would be appreciated.

I have tried if(grade.text doubleValue] == 0){ //Not a number }

but then it still can accept "23f".

Thanks

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