Change height of an SKShapeNode

问题

I have an SKShapeNode which moves down when a sprite gets close to the top of the screen. However I can't seem to change the height of the frame.

Changing the property directly gives me the error 'Expression is not assignable'.

So I tried this code:

        //Move the world down
        world.position = CGPointMake(0.0f, -(20.0f));
        SKAction* moveDown = [SKAction moveToY:(world.position.y - 50.0f) duration:1];
        [world runAction:moveDown];
        CGRect temp = world.frame;
        temp.size.height = (world.frame.size.height / 1.2);
        world.frame = temp;

but it says I can't assign the frame as it's read-only.

回答1:

The frame of an SKShapeNode is read-only. If you would like to change the node's height, you can replace this

CGRect temp = world.frame;
temp.size.height = (world.frame.size.height / 1.2);
world.frame = temp;

with this

world.yScale = 1.0 / 1.2;

来源：https://stackoverflow.com/questions/26977654/change-height-of-an-skshapenode