本文主要实现将ui限制在一个范围内，可以是在当前屏幕内，也可以指定区域。
效果图：
上代码：
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using System.Collections; using System.Collections.Generic; using UnityEngine; public class UITools { public static bool UIAreaLimit(RectTransform target, Rect area, Transform root) { Bounds bounds = RectTransformUtility.CalculateRelativeRectTransformBounds(root, target); Vector2 delta = default; if (bounds.center.x - bounds.extents.x < area.x)//左 { delta.x += Mathf.Abs(bounds.center.x - bounds.extents.x - area.x); } else if (bounds.center.x + bounds.extents.x > area.width / 2)//右 { delta.x -= Mathf.Abs(bounds.center.x + bounds.extents.x - area.width / 2); } if (bounds.center.y - bounds.extents.y < area.y)//上 { delta.y += Mathf.Abs(bounds.center.y - bounds.extents.y - area.y); } else if (bounds.center.y + bounds.extents.y > area.height / 2)//下 { delta.y -= Mathf.Abs(bounds.center.y + bounds.extents.y - area.height / 2); } target.anchoredPosition += delta; return delta != default; } } |
测试脚本：
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using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; public class Test : MonoBehaviour { public RectTransform rt1; private Rect rect; CanvasScaler canvaScaler; void Awake() { canvaScaler = GetComponent<CanvasScaler>(); rect = new Rect(-Screen.width / 2, -Screen.height / 2, Screen.width, Screen.height); float scale = canvaScaler.matchWidthOrHeight == 1 ? canvaScaler.referenceResolution.y / Screen.height : canvaScaler.referenceResolution.x / Screen.width; rect = new Rect(rect.x * scale, rect.y * scale, rect.width * scale, rect.height * scale); } void Update() { UITools.UIAreaLimit(rt1, rect, transform); } } |
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