Init(args) has been designed with inversion of control in mind and aims to make it as easy as possible to work with interfaces instead of specific classes in Unity.<\/p>\n
One pain point when using interfaces in Unity is that checking them for null can be problematic. This is because in addition to being actually null, Objects in Unity can also be\u00a0destroyed<\/a>. You usually don’t even notice the difference when working with specific classes directly, because the Object class has a custom\u00a0== operator<\/a>\u00a0which internally also checks whether the Object has been destroyed. However when an Object has been assigned to an interface type variable and this is compared against null, the overloaded == operator does not get used. This can result in null reference exceptions when trying to access the members of a destroyed Object.<\/p>\n It is also possible to utilize this safe null checking inside classes that don’t derive from any of the base classes in Init(args) by importing the static members of the NullExtensions class.<\/p>\n In addition to the Null property there’s also a new NullOrInactive property. This functions identically to the Null property but also checks if the Object is a component on an inactive GameObject.<\/p>\n This functionality can be particularly useful when utilizing\u00a0Object Pooling<\/a>\u00a0and an inactive GameObject is meant to represent an object which doesn’t exist.<\/p>\n","protected":false},"excerpt":{"rendered":" Init(args) has been designed with inversion of control in mind and aims to make it as easy as possible to work with interfaces instead of specific classes in Unity. One pain point when using interfaces in Unity is that checking them for null can be problematic. This is because in addition to being actually null, ..<\/p>\nPlayer player = FindAnyObjectByType<Player>();\r\nIPlayer iplayer = player as IPlayer;\r\n\r\nDestroy(player);\r\n\r\nDebug.Log(player == null);\u00a0 \/\/ Prints true\r\nDebug.Log(iplayer == null); \/\/ Prints false<\/pre>\n
Player player = FindAnyObjectByType<Player>();\r\nIPlayer iplayer = player as IPlayer;\r\n\r\nDestroy(player);\r\n\r\nDebug.Log(player == null);\u00a0 \/\/ Prints true\r\nDebug.Log(iplayer == null); \/\/ Prints false\r\nDebug.Log(iplayer == Null); \/\/ Prints true<\/pre>\n
using UnityEngine;\r\nusing static Sisus.NullExtensions;\r\n\r\npublic static class PlainOldClass\r\n{\r\n \u00a0\u00a0 public static void Example()\r\n \u00a0\u00a0 {\r\n \u00a0 \u00a0 \u00a0\u00a0 Player player = Object.FindAnyObjectByType<Player>();\r\n \u00a0 \u00a0 \u00a0\u00a0 IPlayer iplayer = player as IPlayer;\r\n\r\n \u00a0 \u00a0\u00a0 Object.Destroy(player);\r\n\r\n\u00a0\u00a0 \u00a0 \u00a0\u00a0 Debug.Log(player == null);\u00a0 \/\/ Prints true\r\n \u00a0 \u00a0 \u00a0\u00a0 Debug.Log(iplayer == null); \/\/ Prints false\r\n \u00a0 \u00a0 \u00a0\u00a0 Debug.Log(iplayer == Null); \/\/ Prints true\r\n \u00a0\u00a0 }\r\n}<\/pre>\nPlayer player = FindAnyObjectByType<Player>();\r\nIPlayer iplayer = player as IPlayer;\r\n\r\nplayer.gameObject.SetActive(false);\r\n\r\nDebug.Log(player.gameObject.activeInHierarchy); \/\/ Prints true\r\nDebug.Log(iplayer == NullOrInactive); \/\/ Prints true<\/pre>\n