public void SaveToPhotosAlbum(Action <NSError> callback = null)
{
if (callback == null)
{
UIImageWriteToSavedPhotosAlbum(Handle, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
}
else
{
var dispatcher = new UIImageDispatcher(callback);
Callbacks.Subscribe(dispatcher, SelectorName, (IntPtr obj, IntPtr e, IntPtr ctx) =>
{
callback(e == IntPtr.Zero ? null : Runtime.GetNSObject <NSError>(e));
dispatcher.Dispose();
});
UIImageWriteToSavedPhotosAlbum(Handle, dispatcher.Handle, ObjC.GetSelector(SelectorName), IntPtr.Zero);
}
}
private static Methods GetMethods(NSObject obj, string selector)
{
Dictionary <IntPtr, Methods> dictionary;
if (!_callbacks.TryGetValue(obj.Handle, out dictionary))
{
_callbacks[obj.Handle] = dictionary = new Dictionary <IntPtr, Methods>();
}
IntPtr selectorHandle = ObjC.GetSelector(selector);
Methods methods;
if (!dictionary.TryGetValue(selectorHandle, out methods))
{
dictionary[selectorHandle] = methods = new Methods(obj);
}
return(methods);
}
public NSObject AddObserver(string name, Action <NSNotification> action, NSObject fromObject = null)
{
var handler = new Observer(action);
Callbacks.Subscribe(handler, SelectorName, n => action(Runtime.GetNSObject <NSNotification>(n)));
ObjC.MessageSend(Handle, "addObserver:selector:name:object:", handler.Handle, ObjC.GetSelector(SelectorName), name, fromObject == null ? IntPtr.Zero : fromObject.Handle);
return(handler);
}