这个适配是根据坐标系的象限的思想来进项适配的，参考了部分的NGUI的适配方案。

在程序的其实，来测量UI距离相机边界的像素然后根据比例来进行适配，个人觉得还不错。 放码！。

有个前提哦就是你要先定一个尺寸。假如我优先适配1024*768。那在放置这个脚本之前，要把自己的界面还成1024*768的哦。我是根据第一次来进行适配的哦。

using UnityEngine;
using System.Collections;
#if UNITY_EDITOR
using UnityEditor;
#endif


public enum QuadrantLayout{
	Quadrant1,
	Quadrant2,
	Quadrant3,
	Quadrant4
}

[ExecuteInEditMode]
public class AutoLayout  : MonoBehaviour{

	[HideInInspector] public QuadrantLayout quadrant;
	[HideInInspector] public Vector2 margin;
	Vector3 lastPostion;
	

#if UNITY_EDITOR
	[HideInInspector] [SerializeField] private bool isFirstLoad=true;
	int pixelWidth;
	void Awake(){
		lastPostion = this.transform.localPosition;
		if(isFirstLoad){
			updateMarginOffset();
			isFirstLoad=false;
		}else{
			resetMarginOffset();
		}
	}
	
	void Update(){
		if(!Application.isPlaying){
			if(Vector3.Distance(lastPostion,this.transform.localPosition)>0.001f && Selection.activeGameObject == this.gameObject){
				updateMarginOffset();
				UnityEditor.EditorUtility.SetDirty(this);
			}else{
				resetMarginOffset();
			}
			lastPostion = this.transform.localPosition;
		}else{
			if((int)Camera.main.pixelWidth!=pixelWidth){
				resetMarginOffset();
			}
			pixelWidth = (int)Camera.main.pixelWidth;
		}
	}
#else
	void Start(){
		resetMarginOffset();
	}
#endif
	
	void updateMarginOffset(){
		float m = (Camera.main.WorldToScreenPoint(new Vector3(1,0,0))-Camera.main.WorldToScreenPoint(Vector3.zero)).x;
		float halfWidth=Camera.main.pixelWidth/2.0f/m;
		float halfHeight=Camera.main.pixelHeight/2.0f/m;
		Vector3 v = this.transform.position;
		
		//1
		if(v.x>=0 && v.y>=0){
			quadrant = QuadrantLayout.Quadrant1;
			margin = new Vector2(halfWidth-v.x,halfHeight-v.y);
		//2
		}else if(v.x>=0 && v.y<=0){
			quadrant = QuadrantLayout.Quadrant2;
			margin = new Vector2(halfWidth-v.x,halfHeight+v.y);
		//3
		}else if(v.x<=0 && v.y<=0){
			quadrant = QuadrantLayout.Quadrant3;
			margin = new Vector2(halfWidth+v.x,halfHeight+v.y);
		//4
		}else if(v.x<=0 && v.y>=0){
			quadrant = QuadrantLayout.Quadrant4;
			margin = new Vector2(halfWidth+v.x,halfHeight-v.y);
		}
		
	}
	
	void resetMarginOffset(){
		Vector3 sv = Vector3.zero;
		
		float m = (Camera.main.WorldToScreenPoint(new Vector3(1,0,0))-Camera.main.WorldToScreenPoint(Vector3.zero)).x;
		float halfWidth=Camera.main.pixelWidth/2.0f/m;
		float halfHeight=Camera.main.pixelHeight/2.0f/m;

		switch(quadrant){
			case QuadrantLayout.Quadrant1:
				sv = new Vector3(halfWidth-margin.x,halfHeight-margin.y,0);
				break;
			case QuadrantLayout.Quadrant2:
				sv = new Vector3(halfWidth-margin.x,margin.y-halfHeight,0);
				break;
			case QuadrantLayout.Quadrant3:
				sv = new Vector3(margin.x-halfWidth,margin.y-halfHeight,0);
				break;
			case QuadrantLayout.Quadrant4:
				sv = new Vector3(margin.x-halfWidth,halfHeight-margin.y,0);
				break;
		}
		
		sv.z = this.transform.position.z;
		
		transform.position = sv;
	}
}