{"id":99,"date":"2020-06-05T02:55:00","date_gmt":"2020-06-05T02:55:00","guid":{"rendered":"https:\/\/lucyestela.com\/dev\/?p=99"},"modified":"2021-03-02T03:00:44","modified_gmt":"2021-03-02T03:00:44","slug":"extension-classes","status":"publish","type":"post","link":"https:\/\/lucyestela.com\/dev\/unity\/extension-classes\/","title":{"rendered":"Extension Classes – Unity"},"content":{"rendered":"
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So these are classes that you write, that extend one of the Unity classes. There’s a good example on one of the Learn Unity tutorial site here<\/a>. But basically  you will create the class file like this:<\/p>\n

using<\/span> <\/span>UnityEngine<\/span>;<\/span> <\/span>\r\nusing<\/span> <\/span>System<\/span>.<\/span>Collections<\/span>;<\/span> <\/span>\r\n\r\n    <\/span>\/\/It is common to create a class to contain all of your <\/span>\r\n    <\/span>\/\/extension methods. This class must be static. <\/span>\r\n\r\n    <\/span>public<\/span> <\/span>static<\/span> <\/span>class<\/span> <\/span>ExtensionMethods<\/span>\r\n{<\/span>\r\n    <\/span>\/\/RULE 1 : extension methods must be declared static. <\/span>\r\n    <\/span>\/\/RULE 2 : The first parameter must have the keyword \"this\"<\/span>\r\n    <\/span>\/\/RULE 3 : Follow the \"this\" with the Class name that you are extending, <\/span>\r\n    <\/span>\/\/ example, Vector3, Transform, Rigidbody<\/span>\r\n    <\/span>\/\/RULE 4 : Follow the class type with a variable name to use in the method<\/span>\r\n    <\/span>\/\/ then just do whatever you need to in the method as per usual<\/span>\r\n\r\n    <\/span>public<\/span> <\/span>static<\/span> <\/span>void<\/span> <\/span>ResetTransformation<\/span>(<\/span>this<\/span> <\/span>Transform<\/span> <\/span>trans<\/span>)<\/span>\r\n    <\/span>{<\/span>\r\n        <\/span>trans<\/span>.<\/span>position<\/span> <\/span>=<\/span> <\/span>Vector3<\/span>.<\/span>zero<\/span>;<\/span>\r\n        <\/span>trans<\/span>.<\/span>localRotation<\/span> <\/span>=<\/span> <\/span>Quaternion<\/span>.<\/span>identity<\/span>;<\/span>\r\n        <\/span>trans<\/span>.<\/span>localScale<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>Vector3<\/span>(<\/span>1<\/span>,<\/span> <\/span>1<\/span>,<\/span> <\/span>1<\/span>);<\/span>\r\n\r\n    <\/span>}<\/span>\r\n\r\n}<\/span><\/span><\/pre>\n
Now you can refer to your new extension method with the following code<\/p>\n
\/\/Notice how you pass no parameter into this<\/span>\r\n\/\/extension method even though you had one in the<\/span>\r\n\/\/method declaration. The transform object that<\/span>\r\n\/\/this method is called from automatically gets<\/span>\r\n\/\/passed in as the first parameter.<\/span>\r\ntransform<\/span>.<\/span>ResetTransformation<\/span>();<\/span><\/span><\/pre>\n
it is the same as saying<\/p>\n
ExtensionMethods.ResetTransformation<\/span>(<\/span>yourTransform<\/span>);<\/span><\/span><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
So these are classes that you write, that extend one of the Unity classes. There’s a good example on one of the Learn Unity tutorial site here. But basically  you will create the class file like this: using UnityEngine;  using System.Collections;      \/\/It is common to create a class to contain all of your      \/\/extension methods. This class must be static.      public static class ExtensionMethods {     \/\/RULE 1 : extension methods must be declared static.      \/\/RULE 2 : The first parameter must have the keyword “this”     \/\/RULE 3 : Follow the “this” with the Class name that you are extending,      \/\/ example, Vector3, Transform, Rigidbody     \/\/RULE 4 : Follow the class type with a variable name to use in the method     \/\/ then just do whatever you need to in the method as per usual     public static void ResetTransformation(this Transform trans)     {         trans.position = Vector3.zero;         trans.localRotation = Quaternion.identity;         trans.localScale = new Vector3(1, 1, 1);     } … Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"bgseo_title":"","bgseo_description":"","bgseo_robots_index":"index","bgseo_robots_follow":"follow","footnotes":""},"categories":[58],"tags":[39,40,4],"class_list":["post-99","post","type-post","status-publish","format-standard","hentry","category-unity","tag-class","tag-extension","tag-unity"],"_links":{"self":[{"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/posts\/99","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/comments?post=99"}],"version-history":[{"count":5,"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/posts\/99\/revisions"}],"predecessor-version":[{"id":238,"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/posts\/99\/revisions\/238"}],"wp:attachment":[{"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/media?parent=99"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/categories?post=99"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lucyestela.com\/dev\/wp-json\/wp\/v2\/tags?post=99"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}