Extract Integer from UITextField?

Newbie question here.

How do I extract an int value from a UITextField (textKey)? I have the following:

NSInteger inputKey = textKey.text;​

Which gives me this warning:

warning: initialization makes integer from pointer without a cast​

Thanks!

 

Thanks. Can you go in the other direction, or do you have to use methods for those as well? For example:

creating an NSMutableArray from ints

creating an NSString from chars