At this time, communication between Lua and the iOS environment is done through an CoronaView allow events to be sent from one environment to the other.
Within Obj-C, these events are represented by NSDictionary instances. In Lua, they are basic Lua tables. Both follow the Corona convention for events with a required "name" key along with a string value that identifies the key. Further information can additionally be passed via a series of
From the Obj-C side, you can send events to a CoronaView instance by constructing a UIButton that should trigger an event within a CoronaView instance, you can create a new instance of an NSDictionary, fill it with the information you wish to pass, and then send the event. On the Lua side, a CoronaView will convert this NSDictionary object to a Lua table and dispatch it to any Lua Runtime listener that’s registered to listen for that event.
The following example illustrates this concept on both the
// [Obj-C]
CoronaView *view = ...
NSDictionary *event = [NSDictionary dictionaryWithObjectsAndKeys:
@"pauseEvent", @"name",
@"pause", @"phase",
@"otherValue", @"otherKey",
nil];
[view sendEvent:event];
-- [Lua]
local function handlePause( event )
if ( event.phase == "pause" ) then
print( event.name ) --> pauseEvent
print( event.otherKey ) --> otherValue
-- Handle pause implementation here
end
return true
end
Runtime:addEventListener( "pauseEvent", handlePause )
Lua code within a CoronaView instance can send events to the CoronaView. These events should be of the type coronaView and you must register a CoronaViewDelegate CoronaView)event table will be converted to a NSDictionary when it is received by the delegate.
The following example illustrates this concept on both the
// [Obj-C]
// Change the value of the UILabel element 'myLabel'
- (id)coronaView:(CoronaView *)view receiveEvent:(NSDictionary *)event
{
NSLog( @"Logging properties of the event: %@", event );
self.myLabel.text = [event objectForKey:@"message"];
return @"Nice to meet you CoronaCards!";
}
-- [Lua]
local function pressMe( event )
if ( event.phase == "ended" ) then
local event = { name="coronaView", message="Hello from CoronaCards!" }
-- Dispatch the event to the global Runtime object
local result = Runtime:dispatchEvent( event )
print( "Response: " .. result ) --> Response: Nice to meet you CoronaCards!
end
return true
end
myObject:addEventListener( "touch", pressMe )
A slightly lower-level way to bridge the