Unity使用摇杆触屏控制

摇杆触屏控制"/>

Unity使用摇杆触屏控制

参考来源

此例的目标：将一个游戏项目中操控由键盘wasd移动鼠标左键射击，转为摇杆触屏移动，点击button射击。

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注意：如果摇杆在某个canvas下记得该canvas用screen space - overlay模式（否则摇杆中心点不会随着屏幕走）。canvas scaler选择scale with screen size，screen match mode选择expand。（为了屏幕分辨率自适应）

首先导入Unity的Standard Assets包，然后在CrossPlatformInput文件夹→Prefabs下找到MobileSingleStickControl预制，拖入场景，它包含了一个左部的摇杆，一个右部的button。

如果拖到场景里不显示的话，在build setting里把platform转换成ios或者Android，然后在Mobile Input选项卡下点击Enable显示就好了。

上面的默认摇杆是没有背景的，通常我们熟知的摇杆有一个圆框，中间一个点状摇杆。所以现在我们给默认摇杆添加背景。

MobileSingleStickControl下新建图片，把摇杆的背景图放上去，然后把摇杆调整到背景图的中心，最后把背景放在最上部以最先渲染。

摇杆资源做好了，现在我们把摇杆和人物操纵联系起来。

修改好之后运行就可以移动摇杆来控制对象了。（我目前测的是鼠标操纵摇杆，还未在xcode上真机触屏测试）

其实标准资产里的摇杆包含一个image组件和joystick脚本，如下。

joystick脚本内容如下

using System;
using UnityEngine;
using UnityEngine.EventSystems;namespace UnityStandardAssets.CrossPlatformInput
{public class Joystick : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler{public enum AxisOption{// Options for which axes to useBoth, // Use bothOnlyHorizontal, // Only horizontalOnlyVertical // Only vertical}public int MovementRange = 100;public AxisOption axesToUse = AxisOption.Both; // The options for the axes that the still will usepublic string horizontalAxisName = "Horizontal"; // The name given to the horizontal axis for the cross platform inputpublic string verticalAxisName = "Vertical"; // The name given to the vertical axis for the cross platform inputVector3 m_StartPos;bool m_UseX; // Toggle for using the x axisbool m_UseY; // Toggle for using the Y axisCrossPlatformInputManager.VirtualAxis m_HorizontalVirtualAxis; // Reference to the joystick in the cross platform inputCrossPlatformInputManager.VirtualAxis m_VerticalVirtualAxis; // Reference to the joystick in the cross platform inputvoid OnEnable(){CreateVirtualAxes();}void Start(){m_StartPos = transform.position;}void UpdateVirtualAxes(Vector3 value){var delta = m_StartPos - value;delta.y = -delta.y;delta /= MovementRange;if (m_UseX){m_HorizontalVirtualAxis.Update(-delta.x);}if (m_UseY){m_VerticalVirtualAxis.Update(delta.y);}}void CreateVirtualAxes(){// set axes to usem_UseX = (axesToUse == AxisOption.Both || axesToUse == AxisOption.OnlyHorizontal);m_UseY = (axesToUse == AxisOption.Both || axesToUse == AxisOption.OnlyVertical);// create new axes based on axes to useif (m_UseX){m_HorizontalVirtualAxis = new CrossPlatformInputManager.VirtualAxis(horizontalAxisName);CrossPlatformInputManager.RegisterVirtualAxis(m_HorizontalVirtualAxis);}if (m_UseY){m_VerticalVirtualAxis = new CrossPlatformInputManager.VirtualAxis(verticalAxisName);CrossPlatformInputManager.RegisterVirtualAxis(m_VerticalVirtualAxis);}}public void OnDrag(PointerEventData data){Vector3 newPos = Vector3.zero;if (m_UseX){int delta = (int)(data.position.x - m_StartPos.x);delta = Mathf.Clamp(delta, - MovementRange, MovementRange);newPos.x = delta;}if (m_UseY){int delta = (int)(data.position.y - m_StartPos.y);delta = Mathf.Clamp(delta, -MovementRange, MovementRange);newPos.y = delta;}transform.position = new Vector3(m_StartPos.x + newPos.x, m_StartPos.y + newPos.y, m_StartPos.z + newPos.z);UpdateVirtualAxes(transform.position);}public void OnPointerUp(PointerEventData data){transform.position = m_StartPos;UpdateVirtualAxes(m_StartPos);}public void OnPointerDown(PointerEventData data) { }void OnDisable(){// remove the joysticks from the cross platform inputif (m_UseX){m_HorizontalVirtualAxis.Remove();}if (m_UseY){m_VerticalVirtualAxis.Remove();}}}
}

接下来把鼠标左键开火改为触屏button开火。

首先JumpButton下新建image设为button摁下的image（由原来黑色的图变为红色的图）。然后把该image设为摁下显示，不摁不显示。且与fire键（可以按需命名，即buttonhandler的，和射击脚本内的button名一样就行）关联。

修改脚本内输入接收关联

原脚本：

改为：

jumpbutton上由image，buttonhandler脚本，及event trigger组成，如下：

buttonhandler脚本如下：

using System;
using UnityEngine;namespace UnityStandardAssets.CrossPlatformInput
{public class ButtonHandler : MonoBehaviour{public string Name;void OnEnable(){}public void SetDownState(){CrossPlatformInputManager.SetButtonDown(Name);}public void SetUpState(){CrossPlatformInputManager.SetButtonUp(Name);}public void SetAxisPositiveState(){CrossPlatformInputManager.SetAxisPositive(Name);}public void SetAxisNeutralState(){CrossPlatformInputManager.SetAxisZero(Name);}public void SetAxisNegativeState(){CrossPlatformInputManager.SetAxisNegative(Name);}public void Update(){}}
}

注意如果仅使用以上脚本的话记得导入CrossPlatformInputManager，如下：

using System;
using UnityEngine;
using UnityStandardAssets.CrossPlatformInput.PlatformSpecific;namespace UnityStandardAssets.CrossPlatformInput
{public static class CrossPlatformInputManager{public enum ActiveInputMethod{Hardware,Touch}private static VirtualInput activeInput;private static VirtualInput s_TouchInput;private static VirtualInput s_HardwareInput;static CrossPlatformInputManager(){s_TouchInput = new MobileInput();s_HardwareInput = new StandaloneInput();
#if MOBILE_INPUTactiveInput = s_TouchInput;
#elseactiveInput = s_HardwareInput;
#endif}public static void SwitchActiveInputMethod(ActiveInputMethod activeInputMethod){switch (activeInputMethod){case ActiveInputMethod.Hardware:activeInput = s_HardwareInput;break;case ActiveInputMethod.Touch:activeInput = s_TouchInput;break;}}public static bool AxisExists(string name){return activeInput.AxisExists(name);}public static bool ButtonExists(string name){return activeInput.ButtonExists(name);}public static void RegisterVirtualAxis(VirtualAxis axis){activeInput.RegisterVirtualAxis(axis);}public static void RegisterVirtualButton(VirtualButton button){activeInput.RegisterVirtualButton(button);}public static void UnRegisterVirtualAxis(string name){if (name == null){throw new ArgumentNullException("name");}activeInput.UnRegisterVirtualAxis(name);}public static void UnRegisterVirtualButton(string name){activeInput.UnRegisterVirtualButton(name);}// returns a reference to a named virtual axis if it exists otherwise nullpublic static VirtualAxis VirtualAxisReference(string name){return activeInput.VirtualAxisReference(name);}// returns the platform appropriate axis for the given namepublic static float GetAxis(string name){return GetAxis(name, false);}public static float GetAxisRaw(string name){return GetAxis(name, true);}// private function handles both types of axis (raw and not raw)private static float GetAxis(string name, bool raw){return activeInput.GetAxis(name, raw);}// -- Button handling --public static bool GetButton(string name){return activeInput.GetButton(name);}public static bool GetButtonDown(string name){return activeInput.GetButtonDown(name);}public static bool GetButtonUp(string name){return activeInput.GetButtonUp(name);}public static void SetButtonDown(string name){activeInput.SetButtonDown(name);}public static void SetButtonUp(string name){activeInput.SetButtonUp(name);}public static void SetAxisPositive(string name){activeInput.SetAxisPositive(name);}public static void SetAxisNegative(string name){activeInput.SetAxisNegative(name);}public static void SetAxisZero(string name){activeInput.SetAxisZero(name);}public static void SetAxis(string name, float value){activeInput.SetAxis(name, value);}public static Vector3 mousePosition{get { return activeInput.MousePosition(); }}public static void SetVirtualMousePositionX(float f){activeInput.SetVirtualMousePositionX(f);}public static void SetVirtualMousePositionY(float f){activeInput.SetVirtualMousePositionY(f);}public static void SetVirtualMousePositionZ(float f){activeInput.SetVirtualMousePositionZ(f);}// virtual axis and button classes - applies to mobile input// Can be mapped to touch joysticks, tilt, gyro, etc, depending on desired implementation.// Could also be implemented by other input devices - kinect, electronic sensors, etcpublic class VirtualAxis{public string name { get; private set; }private float m_Value;public bool matchWithInputManager { get; private set; }public VirtualAxis(string name): this(name, true){}public VirtualAxis(string name, bool matchToInputSettings){this.name = name;matchWithInputManager = matchToInputSettings;}// removes an axes from the cross platform input systempublic void Remove(){UnRegisterVirtualAxis(name);}// a controller gameobject (eg. a virtual thumbstick) should update this classpublic void Update(float value){m_Value = value;}public float GetValue{get { return m_Value; }}public float GetValueRaw{get { return m_Value; }}}// a controller gameobject (eg. a virtual GUI button) should call the// 'pressed' function of this class. Other objects can then read the// Get/Down/Up state of this button.public class VirtualButton{public string name { get; private set; }public bool matchWithInputManager { get; private set; }private int m_LastPressedFrame = -5;private int m_ReleasedFrame = -5;private bool m_Pressed;public VirtualButton(string name): this(name, true){}public VirtualButton(string name, bool matchToInputSettings){this.name = name;matchWithInputManager = matchToInputSettings;}// A controller gameobject should call this function when the button is pressed downpublic void Pressed(){if (m_Pressed){return;}m_Pressed = true;m_LastPressedFrame = Time.frameCount;}// A controller gameobject should call this function when the button is releasedpublic void Released(){m_Pressed = false;m_ReleasedFrame = Time.frameCount;}// the controller gameobject should call Remove when the button is destroyed or disabledpublic void Remove(){UnRegisterVirtualButton(name);}// these are the states of the button which can be read via the cross platform input systempublic bool GetButton{get { return m_Pressed; }}public bool GetButtonDown{get{return m_LastPressedFrame - Time.frameCount == -1;}}public bool GetButtonUp{get{return (m_ReleasedFrame == Time.frameCount - 1);}}}}
}

完毕。