The enemy's healthbar decreases in its entirety with a single collision - ios

Question

he problem is that when the player collides with the enemy the health of the enemy in healthBar does not decrease the indicated amount. it simply decreases in its entirety
I can not find a way to update the enemy's healthbar in the func update and try the func didBegin (_ contact: SKPhysicsContact)
enter code here
func initZombie(){
let enemy = Enemigo(imageNamed: "zombie1")
var textures:[SKTexture] = []
for i in 1...2 {
textures.append(SKTexture(imageNamed: "zombie\(i)"))
}
let anima:SKAction = SKAction.animate(with: textures, timePerFrame: 15.0)
enemy.run(SKAction.group([
SKAction.repeatForever(anima),
SKAction.speed(to: 60.0, duration: 0)
]),withKey: "animation")
enemy.healt = 300
enemy.exp = 100
enemy.barraEnemy = SKSpriteNode(color: SKColor.green, size: enemy.barravidaSizeE)
enemy.barraEnemyBack = SKSpriteNode(color: SKColor.red, size: CGSize(width: enemy.barravidaSizeE.width + 300, height: enemy.barravidaSizeE.height + 30))
enemy.barraEnemy.position = CGPoint(x: enemy.position.x , y: enemy.position.y - 150)
enemy.barraEnemy.zPosition = 101
enemy.barraEnemy.anchorPoint = CGPoint(x: 0.0 , y: 0.5)
enemy.addChild(enemy.barraEnemy)
enemy.barraEnemyBack.position = CGPoint(x: enemy.position.x , y: enemy.position.y - 150)
enemy.barraEnemyBack.zPosition = 100
enemy.barraEnemyBack.anchorPoint = CGPoint(x: 0.0, y: 0.5)
enemy.addChild(enemy.barraEnemyBack)
enemy.barraEnemy.size = CGSize(width: enemy.barravidaSizeE.width + CGFloat(enemy.healt) , height: enemy.barravidaSizeE.height + 30)
enemy.zPosition = 100
//enemy.position = CGPoint(x: size.width/2, y: size.height/2)
enemy.position = CGPoint(x:random(min: -1100 , max: 1100), y: random(min: -400 , max: 400))
enemy.name = "zombie"
enemy.setScale(0.4)
addChild(enemy)
enemy.physicsBody = SKPhysicsBody.init(rectangleOf: enemy.size)
enemy.physicsBody?.allowsRotation = true
enemy.physicsBody?.affectedByGravity = false
enemy.physicsBody?.categoryBitMask = 3
enemy.physicsBody?.collisionBitMask = 1
enemy.physicsBody?.contactTestBitMask = 1
enemy.physicsBody?.isDynamic = true
}
enter
code
here
func didBegin(_ contact: SKPhysicsContact) {
var firstBody:SKPhysicsBody
var secondBody:SKPhysicsBody
if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
firstBody = contact.bodyA
secondBody = contact.bodyB
}else{
firstBody = contact.bodyB
secondBody = contact.bodyA
}
if firstBody.categoryBitMask == 1 && secondBody.categoryBitMask == 2 {
life += 100
secondBody.node?.removeFromParent()
}
if firstBody.categoryBitMask == 1 && secondBody.categoryBitMask == 3 {
score += 1
if let myEnemy = secondBody.node as? Enemigo {
myEnemy.healt -= playerAtack
life -= zombieAtack
myEnemy.barraEnemy.size = CGSize(width: myEnemy.barravidaSizeE.width + CGFloat(myEnemy.healt), height: myEnemy.barravidaSizeE.height)
print(myEnemy.healt)
if myEnemy.healt <= 0 {
playerAtack += 10
life += 100
spawnItem(point: secondBody.node!.position)
secondBody.node?.removeFromParent()
}
}
}
}