sprite kit - Spritekit - Spawn waves of monsters -

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i'm making simple racing game in monsters spawned (randomly) 3 out of 5 lanes in portrait mode. 

 -(void)addenemy { skspritenode *enemy; enemy = [skspritenode spritenodewithimagenamed:@"enemy1"]; [enemy setscale:.65];  enemy.physicsbody = [skphysicsbody bodywithrectangleofsize:enemy.size]; enemy.physicsbody.categorybitmask = obstaclecategory; enemy.physicsbody.dynamic = yes; enemy.zposition = 2; enemy.physicsbody.contacttestbitmask = turtlecategory; enemy.physicsbody.collisionbitmask = 0; enemy.physicsbody.usesprecisecollisiondetection = yes; enemy.name = @"enemy";   //selecting random y position enemy  int r = (arc4random() % 5) ;  enemy.position = cgpointmake(48+r*56,self.frame.size.height);  [self addchild:enemy]; skaction *actionmove = [skaction moveto:cgpointmake(enemy.position.x,-80)         duration:1.43]; [enemy runaction:actionmove];  skspritenode *enemy2; enemy2 = [skspritenode spritenodewithimagenamed:@"enemy1"]; [enemy2 setscale:.65];  //adding spritekit physicsbody collision detection enemy2.physicsbody = [skphysicsbody bodywithrectangleofsize:enemy.size]; enemy2.physicsbody.categorybitmask = obstaclecategory; enemy2.physicsbody.dynamic = yes; enemy2.zposition = 2; enemy2.physicsbody.contacttestbitmask = turtlecategory; enemy2.physicsbody.collisionbitmask = 0; enemy2.physicsbody.usesprecisecollisiondetection = yes; enemy2.name = @"enemy2";   //selecting random y position enemy  int r2 = (arc4random() % 5) ;  enemy2.position = cgpointmake(48+r2*56,self.frame.size.height);  [self addchild:enemy2]; skaction *actionmove2 = [skaction moveto:cgpointmake(enemy2.position.x,-80)         duration:1.43]; [enemy2 runaction:actionmove2];  skspritenode *enemy1; enemy1 = [skspritenode spritenodewithimagenamed:@"boss1"]; [enemy1 setscale:.65];  //adding spritekit physicsbody collision detection enemy1.physicsbody = [skphysicsbody bodywithrectangleofsize:enemy1.size]; enemy1.physicsbody.categorybitmask = obstaclecategory; enemy1.physicsbody.dynamic = yes; enemy1.zposition =2; enemy1.physicsbody.contacttestbitmask = turtlecategory; enemy1.physicsbody.collisionbitmask = 0; enemy1.physicsbody.usesprecisecollisiondetection = yes; enemy1.name = @"enemy1";   int r1 = (arc4random() % 5) ;  enemy1.position = cgpointmake(48+r1*56,self.frame.size.height);  [self addchild:enemy1];  skaction *actionmove1 = [skaction moveto:cgpointmake(enemy1.position.x,-80)         duration:1.43]; [enemy1 runaction:actionmove1];

however, 1 of problem of code monsters spawned on top of each other. there better way this? 

- (cgfloat)randomvaluebetween:(cgfloat)low andvalue:(cgfloat)high { return (((cgfloat) arc4random() / 0xffffffffu) * (high - low)) + low; }

i found piece of code raywenderlich tutorial think.

what u can call,

 cgfloat r1 = [self randomvaluebetween:0 andvalue:3];  cgfloat r2 = [self randomvaluebetween:3 andvalue:6]; etc

that might give different values u can use offset.


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