When each one runs, and what goes in it.
The problem
Null, but only sometimes.
// HUD.csvoid Awake(){ _health = Player.Instance.Health; // NullReferenceException} // Player.csvoid Awake() => Instance = this;
It works or crashes depending on which object Unity happens to wake first.
Why it happens
Every Awake runs before any Start.
When a scene loads, Unity calls Awake on everything first. Only then does it call Start.
- 1 · Awake
- every object, any order
- 2 · Start
- every object, after all Awakes
The fix
Set up yourself, then talk to others.
In Awake, only touch your own object. In Start, every other object is already awake.
Awake→my own setup
Start→talk to others
The fix in code
Move it to Start.
// Player.csvoid Awake() => Instance = this; // HUD.csvoid Start(){ _health = Player.Instance.Health;}
Player sets Instance in Awake. HUD reads it in Start, when it's guaranteed to exist.
The rule
Awake for yourself. Start for others.
- Get my components
- Awake
- Find other objects
- Start
- Order between objects
- not guaranteed