Implement my enemy class to the Game Scene - ios

I'm still fairly new to programming and what I tried to do is the following: So I separated my Enemies from my game scene to a different class.
In the Enemy class.m file I declared 6 methods. Every method represents a new level, which will get called from the game scene.
So in the methods I declare the sprite's image, path, shooting particle type, etc..
Here's an example of the level 1 method in the EnemyClass.m file:
+(void)enemiesLevel1
{
EnemyName = #"enemy1";
SKSpriteNode* enemy = [SKSpriteNode spriteNodeWithImageNamed:EnemyName];
pathSpeed = 3;
CGPathRef path = CGPathCreateWithEllipseInRect(CGRectMake(0,0,400,400), NULL);
SKAction *followTrack = [SKAction followPath:path
asOffset:NO
orientToPath:YES
duration:pathSpeed];
SKAction *forever = [SKAction repeatActionForever:followTrack];
SKAction *addEnemy = [SKAction runBlock:^{
[GameScene addChild: enemy];
}];
SKAction *enemySequence = [SKAction sequence:#[addEnemy, forever]];
[GameScene runAction: enemySequence];
}
However, Xcode is states two issues:
No known class method for selector "addChild"
and
No known class method for selector "runAction"
I'm calling the method from GameScene.m with:
[EnemyClass enemiesLevel1]
It may seem like a dumb question, but I am still new and I would greatly appreciate any help!

The problem is, you should create instance of EnemyClasss in your GameScene and then use it; your code should look like this;
In EnemyClass.m:
-(void)enemiesLevel1
{
EnemyName = #"enemy1";
SKSpriteNode* enemy = [SKSpriteNode spriteNodeWithImageNamed:EnemyName];
pathSpeed = 3;
CGPathRef path = CGPathCreateWithEllipseInRect(CGRectMake(0,0,400,400), NULL);
SKAction *followTrack = [SKAction followPath:path
asOffset:NO
orientToPath:YES
duration:pathSpeed];
SKAction *forever = [SKAction repeatActionForever:followTrack];
SKAction *addEnemy = [SKAction runBlock:^{
[self addChild: enemy];
}];
SKAction *enemySequence = [SKAction sequence:#[addEnemy, forever]];
[self runAction: enemySequence];
}
In GameScene.m:
EnemyClass *enemy= [[EnemyClass alloc] initWithSize:self.size];
and then you can use:
[self addChild: [enemy enemiesLevel1]];

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Ok I'm fairly new to coding with sprite kit so I don't know too much. I'm trying to make 5 bricks spawn above the scene and then slide down into the scene every 5 seconds. I thought this code would work but it does absolutely nothing to my scene.
I have another method that has bricks already loaded into the scene and that works so I don't think that would affect this much but not really sure.
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I have a sequence of SKActions that I would like to play but they do not play properly. The eye only closes and never opens again. I have no clue why this is occurring but maybe you do! Help is appreciated, thank you.
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