Arduino + wifi shield + xcode

Hi eveybody,
i'm trying to find on the web some tutorial that explains how to connect arduino + official wifi shield and comunicate with xcode app (mac/iphone/ipad).
For example:
I want to send from arduino a number to the iphone app made in xcode
then i want to send from this app another number to arduino.
How?

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how to connect arduino + official wifi shield and comunicate with xcode app

The official WiFi shield allows you to connect the Arduino to an EXISTING WiFi network. It does not CREATE a WiFi network.

So, it is not clear what you are trying to do. If the Arduino can connect to a network, do you want it to then be a client, making requests, or a server, responding to requests?

If the Arduino is a client, the iPhone is not going to be a server, so what it's role is unclear.

If the Arduino is a server, the iPhone already has a an app that can connect to it (Safari), so it's unclear what your app will be doing.

ok Fair enough, but how can i connect arduino to an iphone and comunicate with it?
I need to send information of sensor to the iphone and read it inside a xcode app.
Can i comunicate via bluetooth in some way?

but how can i connect arduino to an iphone and comunicate with it?

Use a Redpark Cable (google it).

Can i comunicate via bluetooth in some way?

No.

what about bluetooth LE?