how do i authenticate the user and load a table view on success?

i'm new to iphone dev.. i was trying to create an application which will authenticate the user and download some data from de url(.php) via xml parsing into the table view. i have figur开发者_如何学Ced how to parse and populate the table view but stuck up with user authentication... ie- extracting textfield data and appending it to the URL on submit. n loading table view on success... could anyone please help me out..

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I’m going to separate this answer into two parts: one for appending the user name onto the URL and another for populating the table view.

Appending the User Name Onto the URL
Right now, you probably have a string for the URL (we’ll call it URLString) and a text field for the username (we’ll call it usernameTextField). Here is how you would append the contents of the text field to the URL string.

NSString *URLString = @"http://your.domain.goes.here/something?user=";

NSString *userName = [ usernameTextField text ];

NSString *newURLString = [ URLString stringByAppendingString:userName ];

NSURL *URLToLoad = [ NSURL URLWithString:newURLString ];

That gives you an NSURL to use in fetching the data.

Populating the Table View
Here, you want to have a function that loads the data from the URL. Where you currently parse the XML, add in some error-checking that checks to see if the page is valid. If so, you can call

[ tableView reloadData ];

to reload the table view. In your table view data source’s implementation of the numberOfSectionsInTableView:, numberOfRowsInSection:, cellForRowAtIndexPath:, and other methods, check to see if valid data has been received and, if not, either display no sections and no rows or display a cell with a message to the user to log in.

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[myTextField text];

this line will extract data from your text field. for login you can use NSMutableURLRequest ot, for rxample, ASIHTTPRequest(this is third-party library) to login. then you can show your tableView in request's delegate method