Storing and Retrieving the PIN
After a new KeychainItemWrapper has been configured in the manner described in the preceding section, data can be stored into it. Storing information in a Keychain is very similar to storing data in a dictionary. The sample app first checks to make sure that both of the PIN text fields match; then it calls setObject: on the pinWrapper that was created in the preceding section. For the key identifier kSecValueData is used. This item is covered more in depth in the section “Keychain Attribute Keys”; for now, however, it is important to use this constant.
if([pinField.text isEqualToString: pinFieldRepeat.text]){ [pinWrapper setObject:[pinField text] forKey:kSecValueData];}
After a new ...
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