Executealways of unity is replacing executeineditmode

stay Unity The editor of is divided into three modes ：

1. Editor Mode ： Open any project , Do nothing Unity It is in an editable state , This is the editor mode ;
2. Operation mode ： When we click Play（） When running a scenario , At this time Unity It is in operation mode ;
3. Preform mode ： When Unity Get into Prefab The corresponding editing state is called preform mode ;

ExecuteInEditMode

describe ： Make all instances of the script execute in edit mode .

By default , Only execute in editor running mode MonoBehaviours. By adding this attribute ,MonoBehaviour Any instance of will execute its callback function when the editor is in edit mode .

This attribute is being phased out , Because it does not consider the precast mode . If you edit a with MonoBehaviour And the preform with this attribute enabled , Then enter the playback mode , The editor will exit the preform mode , To prevent accidental modification of the preform caused by the logic used only in the playback mode .

To instruct MonoBehaviour It is safe to consider the preform mode correctly and open it in the preform mode during the playback mode , You can use properties ExecuteAlways Replace this attribute .

The following functions and operation modes are called differently ：

• Update： Only when the scene changes .
• OnGUI： stay “ Game view ” Called when a non editor is received . Event it does not use ( for example ,EventType.ScrollWheel) And do not forward to the editor's keyboard shortcut system ( for example ,EventType.KeyDown, EventType.KeyUp). Events forwarded to the game view will be queued , Immediate treatment cannot be guaranteed .
• OnRenderObject： Call other rendering callback functions on each redrawing of the scene view or game view .

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ExecuteAlways

Make the instance of the script always execute , As Play Mode Part of and Editing.

By default ,MonoBehaviours Only in Play Mode perform .

When you want the script to do something as part of the editor's work , have access to [ExecuteAlways] attribute , This tool is not necessarily related to building

Only in Scene The change is called Update
When Game Trying to receive a non editor event that it does not use （ for example ,EventType.ScrollWheel） Would call OnGUI
Try or Game Every attempt to redraw will call OnRenderObject And other rendering callback functions