I can't stop node on begin contact - ios

Question

I tried so much methods but i didn't stop the cats when begin contacts.Here is node moving method:
[self enumerateChildNodesWithName:#"cat" usingBlock:^(SKNode *node, BOOL *stop){
SKSpriteNode *tempCat = (SKSpriteNode *) node;
float actionDuration = 0.1;
CGPoint offset = CGPointSubtract(_zombie.position, tempCat.position);
CGPoint direction = CGPointNormalize(offset);
CGPoint amountToMovePerSec = CGPointMultiplyScalar(direction, CAT_MOVE_POINTS_PER_SEC);
CGPoint amountToMove = CGPointMultiplyScalar(amountToMovePerSec, actionDuration);
node.position = CGPointMake(node.position.x+amountToMove.x, node.position.y+amountToMove.y);
_velocityCat = CGPointMultiplyScalar(direction, CAT_MOVE_POINTS_PER_SEC);
[self rotateNode:tempCat toFace:_velocityCat rotateRadiansPerSec:CAT_ROTATE_RADIANS_PER_SEC];
How can I stop cat when begin contact?
-(void)didBeginContact:(SKPhysicsContact *)contact
{
uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
if (collision == (enemyCategory | catsCategory)) {
[self enumerateChildNodesWithName:#"cat" usingBlock:^(SKNode *node, BOOL *stop) {
if ([contact.bodyA.node isEqual:node] || [contact.bodyB.node isEqual:node])
{
node.physicsBody = NO;
SKAction *wait = [SKAction waitForDuration:2];
SKAction *catDie = [SKAction runBlock:^{
[node removeFromParent];
}];
SKAction *animation = [SKAction sequence:#[wait, catDie]];
[self runAction:animation];
}
}]; NSLog(#"test 1");
}

Answer 1

Enumerating over all cat nodes is not necessary since you can get the node involved in the contact from the SKPhysicsContact object. The following shows how to do that...
EDIT: you can change the cat node's name to prevent it from chasing the zombie
-(void)didBeginContact:(SKPhysicsContact *)contact
{
uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
if (collision == (enemyCategory | catsCategory)) {
SKNode *node = contact.bodyA.node;
if (contact.bodyB.categoryBitMask == catsCategory) {
node = contact.bodyB.node;
}
// One way to stop the cat from chasing zombie is by changing its name
node.name = #"not cat";
}
}