iphone - Why am I seeing the error "Format is not a string literal and no format arguments"? -

i creating music application in iphone integrating twitter in iphone user can listen particular song click on twitter tab ,log in twitter , post comment in twitter.and need username , password should saved when click on save username , password button remain logged in when in application.

i have done code of saving username , password error indicating ""format not string literal , no format arguments""

here code:

-(ibaction)saveall:(id)sender{       usernamestring =[[nsstring alloc]initwithformat:text1.text]; "format not string literal , no format arguments"      [text1 settext:usernamestring];     nsuserdefaults *usernamedefault =[nsuserdefaults standarduserdefaults];     [usernamedefault setobject:usernamestring forkey:@"stringkey"];        passwordstring =[[nsstring alloc]initwithformat:text2.text]; "format not string literal , no format arguments"      [text2 settext:passwordstring];     nsuserdefaults *passworddefault =[nsuserdefaults standarduserdefaults];     [passworddefault setobject:passwordstring forkey:@"stringkey2"];  } 

please me in solving problem when click on username , password button username , password should saved.

use initwithformat if want create string composed several components, string , integer example this

nsstring *mystring = [nsstring stringwithformat:@"%@ costs %i"itemname, itemprice]; 

itemname nsstring object, itemprice integer.

in case, try doing following way:

usernamestring =[[nsstring alloc]initwithstring:text1.text]; 

or easier

usernamestring = text1.text; 

note: not recommend store passwords or other sensitive information userdefaults better (more safe/secure way) store passwords use devices keychain, stored information heavily encrypted , access happens in safe way.

also it's easy use:

simple iphone tutorial: password management using keychain using sfhfkeychainutils

hope helps.