iOS7中的SpriteKit animateWithTextures无法正常工作

Question

I'm trying to add a little animation based on two pngs, where I create two SKTextures with two images and create an SKAction, and have it run forever with [SKAction repeatActionForever] but nothing is happening, nothing is appearing on the screen.

Here's my code:

_planePropeller = [SKSpriteNode spriteNodeWithImageNamed:@"PLANE PROPELLER 1.png"];
        _planePropeller.xScale = 0.2;
        _planePropeller.yScale = 0.2;
        _planePropeller.position = CGPointMake(screenWidth/2, _plane.size.height+10);
        SKTexture *propeller1 = [SKTexture textureWithImageNamed:@"PLANE PROPELLER 1.png"];
        SKTexture *propeller2 = [SKTexture textureWithImageNamed:@"PLANE PROPELLER 2.png"];
        SKAction *spin = [SKAction animateWithTextures:@[propeller1, propeller2] timePerFrame:0.1];
        SKAction *spinForever = [SKAction repeatActionForever:spin];
        [_planePropeller runAction:spinForever];
        [self addChild:_planePropeller];

Any ideas? Thanks a lot in advance!

Answer 1

could be your positioning details, are you sure they are correct? I've changed your code slightly (self.frame.size.width instead of screenWidth and the same for height, to position it in the centre of the view) and it works for me:

- (SKNode *)propellorNode
{
SKNode *planePropeller = [SKSpriteNode spriteNodeWithImageNamed:@"image1.png"];
planePropeller.xScale = 0.2;
planePropeller.yScale = 0.2;
planePropeller.position = CGPointMake(self.frame.size.width/2, self.frame.size.height/2);
SKTexture *propeller1 = [SKTexture textureWithImageNamed:@"image1.png"];
SKTexture *propeller2 = [SKTexture textureWithImageNamed:@"image2.png"];
SKAction *spin = [SKAction animateWithTextures:@[propeller1, propeller2]    timePerFrame:0.1];
SKAction *spinForever = [SKAction repeatActionForever:spin];
[planePropeller runAction:spinForever];
return planePropeller;
}

Answer 2

So my problem was, actually, my own ignorance, since I first was adding my SKNodes , and the last, when the background should have been added the first, so it could be on the background :)

thanks a lot everybody for the answers!