public static void RefreshAddressBook()
{
if (AddressBook != null)
{
AddressBook.Dispose();
}
AddressBook = new ABAddressBook();
}
public Task <Boolean> RequestPermission()
{
var tcs = new TaskCompletionSource <Boolean>();
if (UIDevice.CurrentDevice.CheckSystemVersion(6, 0))
{
var status = ABAddressBook.GetAuthorizationStatus();
if (status == ABAuthorizationStatus.Denied || status == ABAuthorizationStatus.Restricted)
{
tcs.SetResult(false);
}
else
{
if (addressBook == null)
{
addressBook = new ABAddressBook();
provider = new ContactQueryProvider(addressBook);
}
if (status == ABAuthorizationStatus.NotDetermined)
{
addressBook.RequestAccess(
(s, e) =>
{
tcs.SetResult(s);
if (!s)
{
addressBook.Dispose();
addressBook = null;
provider = null;
}
});
}
else
{
tcs.SetResult(true);
}
}
}
else
{
tcs.SetResult(true);
}
return(tcs.Task);
}
public void Dispose()
{
addressBook.Dispose();
}