iOS detect WiFi hotspots or Bluetooth Devices

I know that without users perm开发者_运维知识库ission trying to switch on WiFi or Bluetooth is not possible (rather comes under private API). I dont want to go there.

Assuming WiFi is switched on or assuming bluetooth is switched on. Is it possible to detect all Wifi hotspots around my device (iPhone or iPad)? Same for Bluetooth?

I want to do this in Xcode Version 4.x with iOS SDK 4.3

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Update
Apple has deprecated a large part of the GameKit peering methods in iOS7. Added updated information for iOS8.

iOS7 and earlier - GameKit/Wi-Fi;
The GameKit documentation contains all the information required to set up a peering mechanism using bluetooth The GKPeerPickerController is the most important part for peering.

For peering using Wi-Fi; Apple's Reachability example uses such a mechanism

iOS8
In iOS8 Apple has introduced the Multipeer Connectivity Framework. Using this you can start using peering for Wi-Fi, bluetooth and other available services more easily. For starters you can use the MCNearbyServiceBrowserClass to search for nearby devices and invite users a peer-to-peer session.