ABAddressBook Check

gistfile1.cs

if (UIDevice.CurrentDevice.CheckSystemVersion (6, 0))
{
  var status = ABAddressBook.GetAuthorizationStatus();
	if (status == ABAuthorizationStatus.Denied || status == ABAuthorizationStatus.Restricted) {
		// no address book
	} else {
		if (this.addressBook == null)
			this.addressBook = new ABAddressBook();
 
		if (status == ABAuthorizationStatus.NotDetermined) {
			this.addressBook.RequestAccess ((success, e) => {
				if (!success) {
					this.addressBook.Dispose();
					this.addressBook = null;
				} else {
					// approved
				}
			});
		} else {
			// already approved
		}
	}
} else {
	// no check needed
}