Question

我希望蓝色充满。
但它只会扩散到一半。

https://i.stack.imgur.com/UQsiB.png

using UnityEngine;
using System.Collections;

public class PlayerMovement : MonoBehaviour {

    Direction currentDir;
    Vector2 input;
    bool isMoving = false;
    Vector3 startPos;
    Vector3 endPos;
    float t;

    public Sprite northSprite;
    public Sprite eastSprite;
    public Sprite southSprite;
    public Sprite westSprite;

    public float walkSpeed = 1f;

    public bool isAllowedToMove = true;

    void Start()
    {
        isAllowedToMove = true;
    }

    void Update () { 

        if(!isMoving && isAllowedToMove)
        {
            input = new Vector2(Input.GetAxis("Horizontal"), Input.GetAxis("Vertical"));
            if (Mathf.Abs(input.x) > Mathf.Abs(input.y))
                input.y = 0;
            else
                input.x = 0;

            if(input != Vector2.zero)
            {

                if(input.x < 0)
                {
                    currentDir = Direction.West;
                }
                if(input.x > 0)
                {
                    currentDir = Direction.East;
                }
                if(input.y < 0)
                {
                    currentDir = Direction.South;
                }
                if (input.y > 0)
                {
                    currentDir = Direction.North;
                }

                switch(currentDir)
                {
                    case Direction.North:
                        gameObject.GetComponent<SpriteRenderer>().sprite = northSprite;
                        break;
                    case Direction.East:
                        gameObject.GetComponent<SpriteRenderer>().sprite = eastSprite;
                        break;
                    case Direction.South:
                        gameObject.GetComponent<SpriteRenderer>().sprite = southSprite;
                        break;
                    case Direction.West:
                        gameObject.GetComponent<SpriteRenderer>().sprite = westSprite;
                        break;
                }

                StartCoroutine(Move(transform));
            }

        }

    }

    public IEnumerator Move(Transform entity)
    {
        isMoving = true;
        startPos = entity.position;
        t = 0;

        endPos = new Vector3(startPos.x + System.Math.Sign(input.x), startPos.y + System.Math.Sign(input.y), startPos.z);

        while (t < 1f)
        {
            t += Time.deltaTime * walkSpeed;
            entity.position = Vector3.Lerp(startPos, endPos, t);
            yield return null;
        }

        isMoving = false;
        yield return 0;
    }
}

enum Direction
{
    North,
    East,
    South,
    West
}

反向操作也会失败。
https://i.stack.imgur.com/rf00I.png

在两种情况下都很好。
https://i.stack.imgur.com/21ORb.png

Answer 1

用Expanded将要填充空格的那一个包裹起来。如果您希望红色和蓝色都填充行，请用Expanded包裹它们，并使用flex属性为其赋予自己的比例

class TestScene extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Row(
        children: <Widget>[
          Container(
              color: Colors.red,
              child: const Text('1'),
            ),
          Expanded(
            child: Container(
              color: Colors.blue,
              child: const Text('1234567890123456789012345678901234567890'),
            ),
          ),
        ],
      ),
    );
  }
}

Answer 2

这是一种方法！（要占用剩余空间）

String one='1',two='1234567890123456789012345678901234567890';


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      backgroundColor:Colors.white,
      body: Row(
        mainAxisSize:MainAxisSize.max,
        children: <Widget>[
          one.length>=two.length ?
          Expanded(
            child: Container(
              color: Colors.red,
              child: Text(one),
            ),
          ):Container(
              color: Colors.red,
              child: Text(one),
            ),
          two.length>=one.length ?
          Expanded(
            child: Container(
              color: Colors.blue,
              child: Text(two),
            ),
          ):Container(
              color: Colors.blue,
              child: Text(two),
            ),
        ],
      ),
    );
  }

或者要保持颜色大小相等，只需在两个小部件中使用Expanded

颤振的灵活行为

2 个答案: