Platform-specific settings in Unity - Step-by-Step Execution

Concept Flow - Platform-specific settings

Start: Unity Project

↓

Open Build Settings

↓

Select Platform

↓

Adjust Platform-specific Settings

↓

Apply & Build

↓

Test on Target Platform

↓

End

This flow shows how you pick a platform in Unity, change its settings, then build and test your game for that platform.

Execution Sample

Unity

using UnityEngine;

public class PlatformCheck : MonoBehaviour
{
    void Start()
    {
#if UNITY_IOS
        Debug.Log("Running on iOS");
#elif UNITY_ANDROID
        Debug.Log("Running on Android");
#else
        Debug.Log("Running on another platform");
#endif
    }
}

This code prints a message depending on which platform the game is running on.

Execution Table

Step	Platform Symbol	Condition Checked	Result	Output
1	UNITY_IOS	Is UNITY_IOS defined?	No
2	UNITY_ANDROID	Is UNITY_ANDROID defined?	Yes	Running on Android
3	Else	No other platform matched	Skipped

💡 UNITY_ANDROID symbol is defined, so that block runs and others are skipped.

Variable Tracker

Variable	Start	After Step 1	After Step 2	Final
Output message	""	""	"Running on Android"	"Running on Android"

Key Moments - 2 Insights

Why does only one Debug.Log run even though there are multiple platform checks?

Because the #if/#elif/#else directives stop checking after the first true condition, as shown in execution_table step 2 where UNITY_ANDROID is true and others are skipped.

What happens if no platform symbol matches?

The #else block runs, printing the default message. This is shown in execution_table step 3 which is skipped here but would run if no symbols matched.

Visual Quiz - 3 Questions

Look at the execution_table, what output is printed at step 2?

A Running on iOS

B Running on Android

C Running on another platform

D No output

💡 Hint

Check the Output column at step 2 in the execution_table.

At which step does the condition become true and stop further checks?

A Step 2

B Step 3

C Step 1

D No step

💡 Hint

Look at the Condition Checked and Result columns in execution_table.

If UNITY_IOS was defined instead of UNITY_ANDROID, what would be the output?

A Running on another platform

B Running on Android

C Running on iOS

D No output

💡 Hint

Refer to the execution_table logic for UNITY_IOS and UNITY_ANDROID conditions.

Concept Snapshot

Platform-specific settings in Unity let you customize builds for iOS, Android, etc.
Use #if UNITY_IOS, #elif UNITY_ANDROID to run code only on certain platforms.
Adjust settings in Build Settings for each platform.
Build and test on the target device to verify.
This helps make your game work well everywhere.

Full Transcript

Platform-specific settings in Unity allow you to customize your game for different devices like iOS or Android. You open Build Settings, pick a platform, change its settings, then build and test. In code, you use #if UNITY_IOS or #elif UNITY_ANDROID to run platform-specific code. Only the first matching condition runs, so only one message prints. If no platform matches, the #else block runs. This helps your game behave correctly on each device.