描述

This function opens a window and displays the question you define in the function to the user. This is an asynchronous function, and as such GameMaker Studio 2 does not block the device it is being run on while waiting for answer, but rather keeps on running events as normal. The function has two buttons that show "Yes" and "No", and once the user has pressed one, an asynchronous Dialog event is triggered which, for the duration of that event only, will have a ds_map stored in the variable async_load.

This map will contain the two keys, "id", and "status". "id" is the value that was returned by the function when called, while the "status" will be either true or false for "Yes" and "No" respectively.

语法：

show_question_async(string);

参数	描述
String（字符串）	The question to ask to the user.

返回：

Real（实数）

Extended 举例：

The left mouse press event (for example) of the object that is showing the message would have the following code:

msg = show_question_async("Do you want to buy some armour for " + string(armour[0, 5]) + "coins?");

The above will show a question with the given string, requesting that the user press either "yes" or "No". The function id is stored in the variable "msg" and will be used in the asynchronous Dialogs event as shown below:

var i_d, stat;
i_d = ds_map_find_value(async_load, "id");
if i_d == msg
   {
   if ds_map_find_value(async_load, "status")
      {
      coins -= armour[0,5];
      global.protection += armour[0,0];
      }
   }

The above code checks the "id" key of the returned ds_map against the value stored in the variable "msg". If they are the same, it then checks to see if one of the two buttons were pressed and if it returns true it will then deduct a value from a variable and add a value to a global variable too.