I can't jump and move at the same time unity2d - unity3d

Question

i made 2d character and 3 ui buttons and they worked well
but the problem is when moving to the right or left by the ui buttons i can't jump however when jump from the ui button i can move to right and left
this is the script
public class PlayerWalk : MonoBehaviour {
private PlayerAnimation playerAnim;
private Rigidbody2D myBody;
private SpriteRenderer spriteRenderer;
public float speed = 7f;
public float jumpForce = 7f;
private bool moveLeft; // determine if we move left or right
private bool dontMove; // determine if we are moving or not
private bool canJump; // we will test if we can jump
void Start () {
playerAnim = GetComponent<PlayerAnimation>();
myBody = GetComponent<Rigidbody2D>();
dontMove = true;
}
void Update () {
//DetectInput();
HandleMoving();
}
void HandleMoving() {
if (dontMove) {
StopMoving();
} else {
if (moveLeft) {
MoveLeft();
} else if (!moveLeft) {
MoveRight();
}
}
} // handle moving
public void AllowMovement(bool movement) {
dontMove = false;
moveLeft = movement;
}
public void DontAllowMovement() {
dontMove = true;
}
public void Jump() {
if(canJump) {
myBody.velocity = new Vector2(myBody.velocity.x, jumpForce);
//myBody.AddForce(Vector2.right * jumpForce);
}
}
// PREVIOUS FUNCTIONS
public void MoveLeft() {
myBody.velocity = new Vector2(-speed, myBody.velocity.y);
playerAnim.ZombieWalk(true, true);
}
public void MoveRight() {
myBody.velocity = new Vector2(speed, myBody.velocity.y);
playerAnim.ZombieWalk(true, false);
}
public void StopMoving() {
playerAnim.ZombieStop();
myBody.velocity = new Vector2(0f, myBody.velocity.y);
}
void DetectInput() {
float x = Input.GetAxisRaw("Horizontal");
if (x > 0)
{
MoveRight();
}
else if (x < 0)
{
MoveLeft();
}
else
{
StopMoving();
}
}
void OnCollisionEnter2D(Collision2D collision) {
if(collision.gameObject.tag == "Ground") {
canJump = true;
}
}
void OnCollisionExit2D(Collision2D collision) {
if (collision.gameObject.tag == "Ground") {
canJump = false;
}
}
} // class
the 2d character moves well and there is no bugs or problems with scripts
Any help??
I don't know where is the problem??
**Note ** i used unity5.6

Answer 1

I would say onTriggerEnter2D instead of using onCollisionEnter2D would be a better option in this scenario. You can read more about that here.
https://answers.unity.com/questions/875770/ontriggerenter-or-oncollisionenter-1.html#:~:text=OnCollisionEnter%20is%20called%20when%20two,with%20%22IsTrigger%22%20set).
Did you try to debug the value of canJump while you are trying to move left or right?