最近在找Unity上使用的依赖注入框架，然后找到了一个叫PowerInjectUnity的插件，看下来，还行。@H_403_1@

@H_403_1@

PowerInjectUnity在Unity商场里有，也将源码托管在了GitHub。使用说明也在Github。
@H_403_1@

https://github.com/mlp1802/PowerInjectUnity
@H_403_1@

@H_403_1@

使用简单总结@H_403_1@

1、根节点必须有PowerPipeline组件@H_403_1@

2、[Insert]：注解允许类被注入、[Power]：不允许类被注入@H_403_1@

3、[Inject]：注入对象、[Produce]：注入方法（这个注解我没看懂）@H_403_1@

4、[OnInjected]：使注解的方法在Start()事件后运行。@H_403_1@

5、[NewInstance]：在当前类里新建对象，该对象可以不是[Insert]的对象。@H_403_1@

@H_403_1@

@H_403_1@

插件安装@H_403_1@

将下载下来的内容导入，就可以了，其中还有一个demo@H_403_1@

@H_403_1@

@H_403_1@

使用@H_403_1@

首先，需要一个PowerPipeline的组件作为根节点，所有需要注入或者被注入的对象必须在这个节点下面@H_403_1@

@H_403_1@

@H_403_1@

任何MonoBehavIoUr对象，可以用[Insert]注解来标记为可注入的对象@H_403_1@

using UnityEngine;
using PowerInject;


[Insert]
public class One : MonoBehavIoUr {


<span style="white-space:pre">	</span>// Use this for initialization
<span style="white-space:pre">	</span>void Start () {
<span style="white-space:pre">		</span>Debug.Log ("one start.");
<span style="white-space:pre">	</span>}


<span style="white-space:pre">	</span>public void Output(){
<span style="white-space:pre">		</span>Debug.Log ("one out");
<span style="white-space:pre">	</span>}
}

@H_403_1@ 用[Inject]注解来实现注入对象

using UnityEngine;
using PowerInject;


[Insert]
public class Two : MonoBehavIoUr {


<span style="white-space:pre">	</span>[Inject]
<span style="white-space:pre">	</span>public One one;


<span style="white-space:pre">	</span>void Start () {
<span style="white-space:pre">		</span>Debug.Log ("two start.");
<span style="white-space:pre">		</span>one.Output ();
<span style="white-space:pre">	</span>}


<span style="white-space:pre">	</span>void Update () {
<span style="white-space:pre">		</span>one.Output ();
<span style="white-space:pre">	</span>}
}

@H_403_1@

@H_403_1@

带有[Insert]标记的MonoBehavIoUr对象都可以继续注入。@H_403_1@

using UnityEngine;
using PowerInject;

[Insert]
public class Three : MonoBehavIoUr {

	[Inject]
	public One one { get; set; }

	// Use this for initialization
	void Start () {
		Debug.Log ("three start");
	}
}

using UnityEngine;
using PowerInject;

[Power]
public class Four : MonoBehavIoUr {

	[Inject]
	Three three;

	// Use this for initialization
	void Start () {
		Debug.Log ("four start");
		three.one.Output ();
	}
	
	// Update is called once per frame
	void Update () {
		three.one.Output ();
	}
}

@H_403_1@

如果只想使用注入对象而不想被其他对象注入，就使用[Power]注解代替[Insert]注解。@H_403_1@

using UnityEngine;
using PowerInject;

[Power]
public class Three : MonoBehavIoUr {

	[Inject]
	public One one { get; set; }

	// Use this for initialization
	void Start () {
		Debug.Log ("three start");
	}

	void Update () {
		Debug.Log ("three update");
		one.Output ();
	}
}

using UnityEngine;
using PowerInject;

[Power]
public class Four : MonoBehavIoUr {

	[Inject]
	Three three;

	// Use this for initialization
	void Start () {
		Debug.Log ("four start");
		three.one.Output ();
	}
	
	// Update is called once per frame
	void Update () {
		Debug.Log ("three update");
		three.one.Output ();
	}
}

@H_403_1@

因为注入生效是在Start()事件以后，所以，提供了[OnInjected]注解，使一个自定义的函数可以替代Start()。@H_403_1@

using UnityEngine;
using PowerInject;

[Insert]
public class Two : MonoBehavIoUr {

	[Inject]
	public One one;

	void Start () {
		Debug.Log ("two start.");
		one.Output ();
	}

	[OnInjected]
	void init(){
		Debug.Log ("two init");
		one.Output ();
	}

	void Update () {
		Debug.Log ("two update");
		one.Output ();
	}
}