SpriteKit-如何添加节点，使其覆盖整个屏幕？

Question

I'm completely new in SpriteKit. I have to create a view similar to this image;

I'm using following code (courtesy of: this question ) to draw the leaves;

-(void)createObjects {

// Create random start point
float randomYPoint = arc4random_uniform(self.view.bounds.size.height);
float randomXPoint = arc4random_uniform(self.view.bounds.size.width);
CGPoint startPoint = CGPointMake(randomXPoint, randomYPoint);

// Create random object and add to scene
SKTexture* objectTexture;
switch (arc4random_uniform(8)) {
    case 0:
        objectTexture = [SKTexture textureWithImageNamed:@"leafOne"];
        break;
    case 1:
        objectTexture = [SKTexture textureWithImageNamed:@"leafTwo"];
        break;
    case 2:
        objectTexture = [SKTexture textureWithImageNamed:@"leafThree"];
        break;
    case 3:
        objectTexture = [SKTexture textureWithImageNamed:@"leafFour"];
        break;
    case 4:
        objectTexture = [SKTexture textureWithImageNamed:@"leafFive"];
        break;
    case 5:
        objectTexture = [SKTexture textureWithImageNamed:@"leafSix"];
        break;
    case 6:
        objectTexture = [SKTexture textureWithImageNamed:@"leafSeven"];
        break;
    case 7:
        objectTexture = [SKTexture textureWithImageNamed:@"leafEight"];
        break;
    default:
        break;
}
SKSpriteNode *object = [SKSpriteNode spriteNodeWithTexture:objectTexture];

object.position = startPoint;
object.name = @"object";

[self addChild: object];
}

Currently I repeatedly call this method (around 300 times in loop) to fill the whole screen with leaves which is a bad approach.

1) How do I know that the whole view is filled with leaves so that I stop the loop?

2) This approach is heavy on CPU and memory, how can I make it efficient and less CPU hungry?

Thanks

Answer 1

This is an answer to another question but it also applies here...

This is not an off the shelf kind of function in SK. Your only solution would be to create a hack to do what you want. One possible approach might be to create a very small node and place it in various positions on the screen, using a loop. For example (x,y position), 0,0 -> 4,0 -> 8,0 and so on...

You can use the -(BOOL)intersectsNode:(SKNode *)node to see if this node intersects any other node.

Another approach might be to use the same kind of logic but use -(BOOL)containsPoint:(CGPoint)p instead.

Both approaches would be processor intensive so you should only run them sparingly.