碰撞事件和display.newGroup.如何将它们连接在一起?电晕

Question

我有一个问题。根据下面的代码，我创建了一个对象x次(在本例中是20次)并添加到一个ballGroup中。此外，每个物体都应该有物体，并对"碰撞"物理事件做出反应。但是所有创建的球都没有分配身体属性(将它们放入ballGroup后)。所以我认为有一个问题(当我插入球到球组)。当我尝试将Body添加到整个ballGroup(一行注释)时，只有最后一个球具有Body属性。你知道怎么解决这个问题吗?

ballGroup = display.newGroup();
ballGroup.collision = onCollision;
ballGroup:addEventListener("collision", ballGroup);
-- physics.addBody(ballGroup,"dynamic", {density = 1, friction = 0, bounce = 1, radius = 10});
for i = 1,20 do
    spawnBall();
end
function spawnBall()
    ball = display.newImage("image.png");
    ball.x = math.random(-W/2, W/2);
    ball.y = math.random(-H/2, H/2);
    physics.addBody(ball,"dynamic", {density = 1, friction = 0, bounce = 1, radius = 10});
    ballGroup:insert(ball);
end
function onCollision(event)
    print("123");
end

Answer 1

每次调用spawnball()时都让你的球本地化

 ballGroup = display.newGroup();
    ballGroup.collision = onCollision;
    ballGroup:addEventListener("collision", ballGroup);
    -- physics.addBody(ballGroup,"dynamic", {density = 1, friction = 0, bounce = 1, radius = 10});
    for i = 1,20 do
        spawnBall();
    end
    function spawnBall()
        local ball = display.newImage("image.png");
        ball.x = math.random(-W/2, W/2);
        ball.y = math.random(-H/2, H/2);
        physics.addBody(ball,"dynamic", {density = 1, friction = 0, bounce = 1, radius = 10});
        ballGroup:insert(ball);
        ball.collision = onCollision
        ball:addEventListener( "collision", ball )
    end
    function onCollision(event)
        print("123");
    end