How to Double Jump in Unity 2D!
If you want to make your player double jump in Unity, follow these steps!
Since you have already configured the game and you are wondering how to make your player double jump in Unity, it is very easy! You just need to go to your player's C# script and make sure that you add some new values: the Boolean that will detect double jump will be called canDoubleJump.
This Boolean will be checked every time you jump. In the first jump, it will be true, but in the second jump, it will be false. To make a quick system that will detect if your player is jumping, you need to add OnJump. In that void, you will check if your player can double jump and is grounded.
Make a small if statement that will check if your player is on ground.
Inside the statement, you need to add a Jump() void. That will be a simple
line that will allow your player to jump.
In OnJump(), you need to check if your player can double jump. This check is very important because during your first jump, your isGrounded Boolean will be false and you need to put an else-if situation to ensure that canDoubleJump is true. After performing the second jump, your canDoubleJump Boolean reverts to false and you should wait until your player lands in order to perform the same double jump again.
If your player cannot double jump, you need to make some changes to isGrounded.
The isGrounded Boolean should be changed because that will introduce a faster way to detect if your player is on the ground. To make that check, introduce the isGrounded Boolean in the void Update(). Then, you should check if the player is on ground and if the y velocity is less than 0.01, meaning that if your player's y velocity is on the ground, it should be able to double jump.
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