How to make an AI to follow the player in 2D C#

Questions & Answers
1

So I have tried just about everything to find out how to script an AI following script correctly.

What my script is supposed to do: Always look at the Player.
What script does:
*When the Player is on the leftside of the Enemy my enemy looks left and vice versa.
*It moves up along it’s local y-as.

using UnityEngine;
using System.Collections;

public class AiZ : MonoBehaviour {
	Transform target;
	public float speed = .01f;

	
	// Use this for initialization
	void Start () {
		
	}
	
	// Update is called once per frame
	void FixedUpdate () {


		target = GameObject.FindWithTag ("Player").transform;

		Vector3 forwardAxis = new Vector3 (0, 0, -1);



		
		transform.LookAt (target.position, forwardAxis);
		Debug.DrawLine (transform.position, target.position);
		transform.eulerAngles = new Vector3 (0, 0, -transform.eulerAngles.z);
		transform.position -= transform.TransformDirection (Vector2.up) * speed ;
	}
	
}
2

Try this:

using UnityEngine;
using System.Collections;

public class AiZ : MonoBehaviour {

    public Transform target;//set target from inspector instead of looking in Update
    public float speed = 3f;


    void Start () {
		
    }

    void Update(){
		
		//rotate to look at the player
		transform.LookAt(target.position);
		transform.Rotate(new Vector3(0,-90,0),Space.Self);//correcting the original rotation
		
		
		//move towards the player
		if (Vector3.Distance(transform.position,target.position)>1f){//move if distance from target is greater than 1
			transform.Translate(new Vector3(speed* Time.deltaTime,0,0) );
		}

    }

}
3

LookAt won’t work in 2D, it makes the sprite flat towards the camera and invisible.

Here’s a simple script I wrote:

	private GameObject Player;

	void Start () {
		Player = GameObject.Find("Player");
	}
	
	void Update () {
		transform.position = Vector2.MoveTowards(transform.position,Player.transform.position, speed*Time.deltaTime);
	}
4

public float speed = 0.5f;
public Transform Player;

// Use this for initialization
void Start () {
	
}

// Update is called once per frame
void Update () {

	Vector3 displacement = Player.position -transform.position;
	displacement = displacement.normalized;

	if (Vector2.Distance (Player.position, transform.position) > 1.0f) {
		transform.position += (displacement * speed * Time.deltaTime);
                     
	}else{
                   //do whatever the enemy has to do with the player
            }

	
}

}