Spawning Sprite in random position not showing

Hey Guys I have a method that spawns an enemy in a random position and it is not showing in my scene , when I check the coordinates on the log and they are valid and they are meant to show on the screen but they never do, why is this? Here is my method :

-(void)spawnEnamies {


            int maxXCoord = self.frame.size.width;
    int maxYCoord = self.frame.size.height;

    int x = arc4random()% maxXCoord;

        int y = arc4random()% maxYCoord - 40;



    NSLog(@"%d, %d", x, y);
    NSLog(@"%f", self.size.width);


    self.backgroundColor = [SKColor blackColor];

    self.physicsWorld.gravity = CGVectorMake(0, 0);
    self.physicsWorld.contactDelegate = self;

    SKNode *enemy = [SKNode node];




    SKSpriteNode *circle = [SKSpriteNode spriteNodeWithImageNamed:@"TapMa"];

    circle.position = CGPointMake(x, y);


    SKEmitterNode *trail = [SKEmitterNode orb_emitterNamed:@"Trail"];
    trail.targetNode = self;
    trail.position = CGPointMake(CGRectGetMidX(circle.frame), CGRectGetMidY(circle.frame));
    [enemy addChild:trail];

    enemy.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:10];
    enemy.physicsBody.mass = 100000;
    enemy.physicsBody.categoryBitMask = CollisionPlayer;
    enemy.physicsBody.contactTestBitMask = CollisionEnemy;

    enemy.position = CGPointMake(x, y);


    [enemy addChild:circle];

    [self addChild:enemy];



}

That is where I spawn my Sprite. Here I will show my whole Scene code -

//
//  GameScene.m
//  TST
//
//  Created by Ajay Venkat on 3/01/2015.
//  Copyright (c) 2015 AJTech. All rights reserved.
//

#import "GameScene.h"

@implementation SKEmitterNode (fromFile)
+ (instancetype)orb_emitterNamed:(NSString*)name
{
    return [NSKeyedUnarchiver unarchiveObjectWithFile:[[NSBundle mainBundle] pathForResource:name ofType:@"sks"]];
}
@end

enum {
    CollisionPlayer = 1<<1,
    CollisionEnemy = 1<<2,
};


NSMutableArray *_enemyArray;

@implementation GameScene
SKNode *_player;
SKNode *_enemy;

-(void)didMoveToView:(SKView *)view {

    [self performSelector:@selector(spawnWall) withObject:nil afterDelay:1];
    [self performSelector:@selector(spawnEnamies) withObject:nil afterDelay:3];

}





-(void)update:(CFTimeInterval)currentTime {
    /* Called before each frame is rendered */
}

-(void)spawnWall {
    self.yScale = -1;

    self.backgroundColor = [SKColor blackColor];

    self.physicsWorld.gravity = CGVectorMake(0, 0);
    self.physicsWorld.contactDelegate = self;



    _player = [SKNode node];
    SKShapeNode *circle = [SKShapeNode node];

    circle.path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 5, self.size.width, 5)].CGPath;
    circle.fillColor = [UIColor blueColor];
    circle.strokeColor = [UIColor blueColor];
    circle.glowWidth = 5;

    SKEmitterNode *trail = [SKEmitterNode orb_emitterNamed:@"Trail"];
    trail.targetNode = self;
    trail.position = CGPointMake(CGRectGetMidX(circle.frame), CGRectGetMidY(circle.frame));
    [_player addChild:trail];

    _player.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:10];
    _player.physicsBody.mass = 100000;
    _player.physicsBody.categoryBitMask = CollisionPlayer;
    _player.physicsBody.contactTestBitMask = CollisionEnemy;

    _player.position = CGPointMake(0.5, self.size.height - 20);



    [self addChild:_player];

}



-(void)spawnEnamies {


             int maxXCoord = self.frame.size.width;
    int maxYCoord = self.frame.size.height;

    int x = arc4random()% maxXCoord;

        int y = arc4random()% maxYCoord - 40;



    NSLog(@"%d, %d", x, y);
    NSLog(@"%f", self.size.width);


    self.backgroundColor = [SKColor blackColor];

    self.physicsWorld.gravity = CGVectorMake(0, 0);
    self.physicsWorld.contactDelegate = self;

    SKNode *enemy = [SKNode node];




    SKSpriteNode *circle = [SKSpriteNode spriteNodeWithImageNamed:@"TapMa"];

    circle.position = CGPointMake(x, y);


    SKEmitterNode *trail = [SKEmitterNode orb_emitterNamed:@"Trail"];
    trail.targetNode = self;
    trail.position = CGPointMake(CGRectGetMidX(circle.frame), CGRectGetMidY(circle.frame));


    enemy.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:10];
    enemy.physicsBody.mass = 100000;
    enemy.physicsBody.categoryBitMask = CollisionPlayer;
    enemy.physicsBody.contactTestBitMask = CollisionEnemy;

    enemy.position = CGPointMake(x, y);


    [enemy addChild:circle];
    [enemy addChild:trail];
    [self addChild:enemy];



}

@end

That is my scene code and this is my viewController code -

//
//  GameViewController.m
//  TST
//
//  Created by Ajay Venkat on 3/01/2015.
//  Copyright (c) 2015 AJTech. All rights reserved.
//

#import "GameViewController.h"
#import "GameScene.h"

@implementation SKScene (Unarchive)

+ (instancetype)unarchiveFromFile:(NSString *)file {
    /* Retrieve scene file path from the application bundle */
    NSString *nodePath = [[NSBundle mainBundle] pathForResource:file ofType:@"sks"];
    /* Unarchive the file to an SKScene object */
    NSData *data = [NSData dataWithContentsOfFile:nodePath
                                          options:NSDataReadingMappedIfSafe
                                            error:nil];
    NSKeyedUnarchiver *arch = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
    [arch setClass:self forClassName:@"SKScene"];
    SKScene *scene = [arch decodeObjectForKey:NSKeyedArchiveRootObjectKey];
    [arch finishDecoding];

    return scene;
}

@end

@implementation GameViewController

- (void)viewDidLayoutSubviews
{
    [super viewDidLoad];

    // Configure the view.
    SKView * skView = (SKView *)self.view;
    skView.showsFPS = YES;
    skView.showsNodeCount = YES;
    /* Sprite Kit applies additional optimizations to improve rendering performance */
    skView.ignoresSiblingOrder = YES;

    // Create and configure the scene.
    GameScene *scene = [GameScene unarchiveFromFile:@"GameScene"];

    scene.scaleMode = SKSceneScaleModeAspectFill;

    // Present the scene.
    [skView presentScene:scene];
}

- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        return UIInterfaceOrientationMaskAllButUpsideDown;
    } else {
        return UIInterfaceOrientationMaskAll;
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

- (BOOL)prefersStatusBarHidden {
    return YES;
}

@end

What I have tried :

I have tried many different methods of getting random values for x, and y all ended up not showing.

I have tried changing the -(void)viewDidLoad to a -(void)viewDidLoayoutSubviews as suggested on another post with the same problem and that ended up same as well. The coordinates I have gotten are valid, and fit perfectly in the screen.

Thank you for helping all.