Unity3d get screen width and height

A camera function is used here Camera.ViewportToWorldPoint, Unity The official definition is ： 
Camera.ViewportToWorldPoint Window to world position  
function ViewportToWorldPoint (position : Vector3) : Vector3

Description describe

Transforms position from viewport space into world space.

From window space to world space .

Viewport space is normalized and relative to the camera. The bottom-left of the camera is (0,0); the top-right is (1,1). The z position is in world units from the camera.

Viewport space is normalized and relative to the camera , The bottom left of the camera is （0,0）; The upper right is （1,1）;Z The position of is the distance to the camera measured in world units .

Note that it transforms a x-y screen position, into a x-y-z position in 3D space.

Notice that it transforms a x-y Screen position to a 3D Spatial x-y-z Location .

You provide the function with a vector where the x-y components of the vector are the screen coordinates and the z component is the distance of the resulting plane from the camera.

This function takes the... In screen coordinates x-y Component vector , also z The component is at a distance from the plane generated by the camera .

After reading the official documents , Now we know how to get the actual width and height of the screen , Here is the sample code ：

    private float width;
    private float height;

    void SetBasicValues(){

        float leftBorder;
        float rightBorder;
        float topBorder;
        float downBorder;
        //the up right corner
        Vector3 cornerPos=Camera.main.ViewportToWorldPoint(new Vector3(1f,1f,Mathf.Abs(Camera.main.transform.position.z)));

        leftBorder=Camera.main.transform.position.x-(cornerPos.x-Camera.main.transform.position.x);
        rightBorder=cornerPos.x;
        topBorder=cornerPos.y;
        downBorder=Camera.main.transform.position.y-(cornerPos.y-Camera.main.transform.position.y);

        width=rightBorder-leftBorder;
        height=topBorder-downBorder;
    }
 
  

   
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Got width And height Is the screen width and height , The meaning of the code has been clearly stated above .