我的spriteNode看起来像这样

mover = [SKSpriteNode spriteNodeWithTexture:Texture1];
[mover setScale:1.0];
[self addChild:mover];

那么我有这种方法应该改变动作图像,但不是.我究竟做错了什么？

- (void)didBeginContact:(SKPhysicsContact *)contact {
    if (contact.bodyA.categoryBitMask == worldCategory) {

        SKTexture* explodeTexture1 = [SKTexture textureWithImageNamed:@"explode"];
        explodeTexture1.filteringMode = SKTextureFilteringNearest;

        mover = [SKSpriteNode spriteNodeWithTexture:explodeTexture1];



    }
}