发布时间:2019-08-25 09:36:43编辑:auto阅读(1344)
反射这玩意,在一些游戏的框架中的确有其优势,但是注意反射或多或少会影响性能的.
在资源的获取上就 使用了反射 , 得到SWF中的美术的资源 如:
public static function getClazz(className : String,loader : Loader = null) : Class{ if(null == loader){ loader = UI_LOADER; } return loader.contentLoaderInfo.applicationDomain.getDefinition(className) as Class; }
当然,像MovieClip,Sprite等除了 使用 new , 还可以用反射 来使它们实例化.
var mcClass:Class = getDefinitionByName("flash.display.MovieClip") as Class; var mc:MovieClip = new mcClass() as MovieClip;
扩展一下:这个getDefinitionByName其实很有用,也可以反射自己自定义的类:
package com.ainy.factorymanager{ public class AnimalFactory{ } }
那么反射 自定义类:
var myClass:Class = getDefinitionByName("com.ainy.factorymanager.AnimalFactory") as Class; var $my : AnimalFactory = new myClass() as AnimalFactory;
再扩展,可以联想到Java的三大框架当中的反射配置XML,当然也可以制成Json的二进制文件,用AS来读解.
这玩意在某些情况下,确实很好用, 但是 反射 是要多耗性能的.
扩展:
对于getDefinitionByName参数的解释:
①
package { import flash.display.Sprite; import flash.text.TextField; import flash.utils.getDefinitionByName; public class AonauflyTest extends Sprite { public function AonauflyTest() { var $reflex_class : Class = getDefinitionByName("flash.text.TextField") as Class; var $txt_reflex : TextField = new $reflex_class() as TextField; $txt_reflex.text = "getDefinitionByName(\"flash.text.TextField\")"; $txt_reflex.width = 250; this.stage.addChild( $txt_reflex ); } } }
得到的结果:
②
package { import flash.display.Sprite; import flash.text.TextField; import flash.utils.getDefinitionByName; public class AonauflyTest extends Sprite { public function AonauflyTest() { var $reflex_class : Class = getDefinitionByName("flash.text::TextField") as Class; var $txt_reflex : TextField = new $reflex_class() as TextField; $txt_reflex.text = "getDefinitionByName(\"flash.text::TextField\")"; $txt_reflex.width = 250; this.stage.addChild( $txt_reflex ); } } }
结果:
可见 flash.text::TextField 和 flash.text.TextField的效果是一样的
返回对象的完全限定名:
①
package { import flash.display.Sprite; import flash.text.TextField; import flash.utils.getDefinitionByName; import flash.utils.getQualifiedClassName; import flash.utils.getQualifiedSuperclassName; import avmplus.getQualifiedSuperclassName; public class AonauflyTest extends Sprite { public function AonauflyTest() { var $reflex_class : Class = getDefinitionByName("flash.text::TextField") as Class; var $txt_reflex : TextField = new $reflex_class() as TextField; // $txt_reflex.text = "getDefinitionByName(\"flash.text::TextField\")"; $txt_reflex.width = 250; this.stage.addChild( $txt_reflex ); //返回对象的完全限定名 var $str : String = avmplus.getQualifiedClassName( TextField ); $txt_reflex.text = $str; } } }
返回结果:
②
package { import flash.display.Sprite; import flash.text.TextField; import flash.utils.getDefinitionByName; import flash.utils.getQualifiedSuperclassName; import avmplus.getQualifiedSuperclassName; public class AonauflyTest extends Sprite { public function AonauflyTest() { var $reflex_class : Class = getDefinitionByName("flash.text::TextField") as Class; var $txt_reflex : TextField = new $reflex_class() as TextField; // $txt_reflex.text = "getDefinitionByName(\"flash.text::TextField\")"; $txt_reflex.width = 250; this.stage.addChild( $txt_reflex ); //返回对象的完全限定名 // var $str : String = avmplus.getQualifiedClassName( TextField ); // $txt_reflex.text = $str; //返回对象的完全限定名 var $str_1 : String = flash.utils.getQualifiedClassName( TextField ); $txt_reflex.text = $str_1; } } }
返回的结果是一样的(都是::的形式):
返回对象的基类的完全限定名:
引文也有2种方式 , 而且返回的结果都一样,所以直接都写出来:
package { import flash.display.Sprite; import flash.text.TextField; import flash.utils.getDefinitionByName; import avmplus.getQualifiedSuperclassName; public class AonauflyTest extends Sprite { public function AonauflyTest() { var $reflex_class : Class = getDefinitionByName("flash.text::TextField") as Class; var $txt_reflex : TextField = new $reflex_class() as TextField; // $txt_reflex.text = "getDefinitionByName(\"flash.text::TextField\")"; $txt_reflex.width = 250; this.stage.addChild( $txt_reflex ); //① //返回对象的基类的完全限定名 // var $str_super : String = avmplus.getQualifiedSuperclassName( TextField ); // $txt_reflex.text = $str_super; //② //返回对象的基类的完全限定名 var $str_super_1 : String = flash.utils.getQualifiedSuperclassName( TextField ); $txt_reflex.text = $str_super_1; } } }
结果:
一个注意(object是所有类的基类,他没有基类,返回null):
//===========================访问类的公共成员================================================================================
使用 : import flash.utils.describeType;
var xml:XML = describeType(userData); 获取对象的公共(public)成员
package com.model { public class BaseModel { public function BaseModel() { } private var _id : int; public function get id() : int { return this._id; } public function set id( value : int ) : void { this._id = value; } } }
package com.model { public final class UserModel extends BaseModel { public function UserModel() { super(); } private var _name : String; public function set name( value : String ) : void { this._name = value; } public function get name() : String { return this._name; } public var _sex : int = 0; private function get sex( ) : int { return _sex; } private function set sex( value : int ) : void { this._sex = value; } private var _occupation : int = 0; private function get occupation():int { return this._occupation; } public function set occupation( value : int ) : void { this._occupation = value; } public function doSomething() : void { } private function doPrivateSomething():void { } public function sum( a : int , b : int = 1 ) : int { return a + b; } } }
重点 :
package { import com.model.UserModel; import flash.display.Sprite; import flash.utils.describeType; public class AonauflyTest extends Sprite { public function AonauflyTest() { var userData : UserModel = new UserModel(); var xml:XML = describeType(userData); var propMap : Object = new Object(); // for(var i:int =0;i<xml.accessor.length();i++){ // trace("name :"+xml.accessor[i].@name);//获取类的属性名 // trace("value : "+userData[xml.accessor[i].@name]);//获取类属性值 // } for each (var item :XML in xml.*) { var itemName : String = item.name().toString(); switch(itemName) { case "variable": propMap["字段:" +item.@name.toString()] = item.@type.toString(); break; case "accessor": var access : String = item.@access; if((access == "readwrite") || (access == "writeonly")) { propMap["属性:"+item.@name.toString()] = item.@type.toString(); } break; } } for (var prop:String in propMap) { trace(prop, "-", propMap[prop]); } trace("========================================================"); trace("xml : "+xml.toXMLString());//遍历转换xml格式的数据 } } }
结果 :
属性:occupation - int
属性:id - int
属性:name - String
字段:_sex - int
========================================================
xml : <type name="com.model::UserModel" base="com.model::BaseModel" isDynamic="false" isFinal="true" isStatic="false">
<extendsClass type="com.model::BaseModel"/>
<extendsClass type="Object"/>
<variable name="_sex" type="int">
<metadata name="__go_to_definition_help">
<arg key="pos" value="340"/>
</metadata>
</variable>
<accessor name="name" access="readwrite" type="String" declaredBy="com.model::UserModel">
<metadata name="__go_to_definition_help">
<arg key="pos" value="273"/>
</metadata>
<metadata name="__go_to_definition_help">
<arg key="pos" value="186"/>
</metadata>
</accessor>
<accessor name="id" access="readwrite" type="int" declaredBy="com.model::BaseModel">
<metadata name="__go_to_definition_help">
<arg key="pos" value="146"/>
</metadata>
<metadata name="__go_to_definition_help">
<arg key="pos" value="215"/>
</metadata>
</accessor>
<accessor name="occupation" access="writeonly" type="int" declaredBy="com.model::UserModel">
<metadata name="__go_to_definition_help">
<arg key="pos" value="648"/>
</metadata>
</accessor>
<method name="sum" declaredBy="com.model::UserModel" returnType="int">
<parameter index="1" type="int" optional="false"/>
<parameter index="2" type="int" optional="true"/>
<metadata name="__go_to_definition_help">
<arg key="pos" value="850"/>
</metadata>
</method>
<method name="doSomething" declaredBy="com.model::UserModel" returnType="void">
<metadata name="__go_to_definition_help">
<arg key="pos" value="744"/>
</metadata>
</method>
<metadata name="__go_to_ctor_definition_help">
<arg key="pos" value="93"/>
</metadata>
<metadata name="__go_to_definition_help">
<arg key="pos" value="42"/>
</metadata>
</type>
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