Auto Singleton

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The simplest singleton tool on the Asset Store. Add the [Singleton] attribute to any class and the asset handles everything: automatic asset generation, cleanup, and polymorphic access at runtime.

Features

• Attribute-based setup: decorate any MonoBehaviour or ScriptableObject with [Singleton]: no base classes, no boilerplate; optional inherited, displayName, and folderPath arguments for fine-grained control
• Automatic asset management: the editor creates and maintains prefabs (MonoBehaviour) or ScriptableObject assets after each compilation; deleting a singleton class also deletes its asset
• Polymorphic access: retrieve all singletons assignable to a type via Singleton<T>.Instances; T can be a base class or an interface
• Instance selection: designate which instance Singleton<T>.Instance returns using SelectInstance: by predicate, priority function, runtime type, direct reference, or no-arg when only one is registered
• Safe access helpers: HasInstance and TryGetInstance let you check availability without catching exceptions; Find returns all instances matching a predicate
• Manual registration: use Singleton.Add and Singleton.Remove at runtime to manage singletons of any reference type, not just Unity objects
• No reload on play mode: works seamlessly with Unity’s no-domain-reload setting
• Editor tooling: Top Bar menu with force-refresh, automatic refresh, change logging, and project icon toggles; singleton list inspector to view and enable/disable each singleton individually

Content

• Singleton attribute: SingletonAttribute for automatic asset management, with inherited, displayName, and folderPath options
• Runtime access classes: Singleton (manual Add / Remove) and Singleton<T> (Instance, Instances, HasInstance, TryGetInstance, Find, SelectInstance)
• Editor tooling: automatic refresh system, singleton list inspector, project icons
• Demo: a Tic Tac Toe game built with MVC, demonstrating 5 singletons across MonoBehaviour, ScriptableObject, and plain class types

Requirements

Unity 6.0 or later