post to twitter using OAuth in iphone..?

how to post to twitter using OAuth..?? i have tried the sample applica开发者_JAVA技巧tions but they open the twitter site for login.(username/password)... but i want is ..i want to store the twitter details at the settings page..

i just want to post the text written in text field..i dont want to login every time ...i want it to be simple..two text fields for username and password and one for message..?can it be possible..??

i want the similar app for facebook for posting on wall..i downloaded the facebook sample app but the problem is each time user had to enter password and the message to be posted is his own dialog box (not the simple text field)..?

You can not store username and password with OAuth.