Synergetic process

The teacher defined ： Start another logical processing while the main thread is running , To assist in the execution of current procedures .

The official definition of ： Xiecheng is a branch executive , Encounter conditions （yield return sentence ） Will hang up , Until the condition is met, it will be waked up and continue to execute the following code .

Points of attention ：

1.Unity At every frame （Frame） Will deal with the coroutines on the object .Unity Mainly in the Update Post processing process （ Check whether the conditions of the cooperation process are met ）, But there are also exceptions ：

2. Synergetic process Update() It's the same , All are Unity The function that each frame pair will handle （ If any ）. If MonoBehaviour Is active （active） State and yield Satisfy the condition of ,

Will execute the following code of the coroutine method . You can also find ： If you call a coroutine in the early stage of an object , The collaboration will run immediately to the first yield return Statement place , If it is yield return null , Will be awakened again at the same frame .

3.Unity Of C# The return value of a coroutine in the code is usually IEnumerator（ iterator ） type ,IEnumerator There are two ways to interface , Namely Current and MoveNext. We can simply think that ：

A coroutine is a function that returns an iterator , At first the iterator's Current Point to the beginning of the function , Every time MoveNext,Current Point to the next yield return The value returned . The iterator method runs to yield return

When the sentence is , Will return a expression Expression and keep the current position in the code . The next time the iterator function is called, execution restarts from that location .

Unity What you do at each frame is ： call coroutines （ iterator ）MoveNext() Method , If you return true , Just continue from the current position .