chore: iOS model loading startup item adjustment

Author: onion

composeApp/src/commonMain/kotlin/org/onion/diffusion/viewmodel/ChatViewModel.kt

@@ -84,10 +84,10 @@ class ChatViewModel  : ViewModel() {
     var wtype = mutableStateOf(-1)
 
     /** Offload to CPU - offload model computations to CPU */
-    var offloadToCpu = mutableStateOf(false)
+    var offloadToCpu = mutableStateOf(getPlatform().isIOS)
 
-    /** Keep CLIP on CPU - keep CLIP model on CPU (enabled by default on macOS) */
-    var keepClipOnCpu = mutableStateOf(getPlatform().isMacOS)
+    /** Keep CLIP on CPU - keep CLIP model on CPU (enabled by default on macOS and iOS) */
+    var keepClipOnCpu = mutableStateOf(getPlatform().isMacOS || getPlatform().isIOS)
 
     /** Keep VAE on CPU - keep VAE decoder on CPU */
     var keepVaeOnCpu = mutableStateOf(false)

shared/src/commonMain/kotlin/org/onion/diffusion/Platform.kt

@@ -3,6 +3,7 @@ package org.onion.diffusion
 interface Platform {
     val name: String
     val isMacOS: Boolean get() = false
+    val isIOS: Boolean get() = false
 }
 
 expect fun getPlatform(): Platform

shared/src/iosMain/kotlin/org/onion/diffusion/Platform.ios.kt

@@ -4,6 +4,7 @@ import platform.UIKit.UIDevice
 
 class IOSPlatform: Platform {
     override val name: String = UIDevice.currentDevice.systemName() + " " + UIDevice.currentDevice.systemVersion
+    override val isIOS: Boolean = true
 }
 
 actual fun getPlatform(): Platform = IOSPlatform()