About the application of delegate and callback function in unity

1. First we need to construct a class for transmitting data and hosting the callback function

For example: (custom constructs as needed)

1 usingUnityengine;2 usingSystem.Collections;3 4 //callback function5  Public Delegate voidWarningresult ();6  Public classWarningmodel:monobehaviour7 {8     //callback function9      PublicWarningresult result;Ten     //Warning Text One      Public stringvalue; A  -     //construct a warning structure body -      PublicWarningmodel (stringS_value, Warningresult S_result =NULL) the     { -          This. Value =S_value; -          This. result =S_result; -     } +}

2. Then instantiate it when needed to construct the structure

Like what:

1    /// <summary>2     ///Enter the game button trigger3     /// </summary>4     voidOnloginclick ()5     {6         //Verify your account password7         //If the account password is incorrect, display the warning panel and return8         if(M_inputaccount.text = =""|| M_inputpassword.text = ="")9         {Ten                                                             //warning Message//callback function OneWarningManager.instance.AddWarringError ("The account password entered is incorrect, please re-enter", Result); A             return; -         } -  the  -         //Enter game, button deprecated -M_entergamebtn.interactable =false; -  +          -     } +     //callback function for testing A     voidResult () at     { -Debug.Log ("Login Interface callback function"); -     } -     

3. Finally take the callback function in the class that needs to implement the function, and implement the method

As follows:

1  //callback function after handling a warning2     PrivateWarningresult result;3 4     /// <summary>5     ///method for displaying warning messages for external calls to be passed6     /// </summary>7     /// <param name= "s_warning" >warning message structure body</param>8      Public voiddoshowwarring (Warningmodel s_warning)9     {Ten         //activating the warning interface OneGameobject.setactive (true); A  -         //If the game object does not come and is found, first assign the game object -         if(M_warningtex = =NULL) the         { - Init (); -         } -  +         //displaying warning messages -M_warningtex.text =S_warning.value; +         //populating the callback function A          This. result =S_warning.result; at  -         //if the callback function is not empty, the callback function is executed -         if(Result! =NULL) -         { - result (); -         } in}

About the application of delegate and callback function in unity