Initial iOS platform support

Make the library compile on iOS

Author: darrarski

Package.swift

@@ -5,7 +5,8 @@ import PackageDescription
 let package = Package(
   name: "swiftui-app-icon-creator",
   platforms: [
-    .macOS(.v11)
+    .macOS(.v11),
+    .iOS(.v13),
   ],
   products: [
     .library(

Sources/AppIconCreator/IconImage.swift

@@ -1,3 +1,4 @@
+#if os(macOS)
 import SwiftUI
 
 public struct IconImage {
@@ -98,3 +99,4 @@ extension NSImage {
     return imageRep.representation(using: .png, properties: [.compressionFactor: 1])!
   }
 }
+#endif

Sources/AppIconCreator/IconPreview.swift

@@ -1,3 +1,4 @@
+#if os(macOS)
 import SwiftUI
 
 public struct IconPreview<Icon: View>: View {
@@ -41,3 +42,4 @@ public struct IconPreview<Icon: View>: View {
       }
   }
 }
+#endif

Sources/AppIconCreator/IconPreviews.swift

@@ -1,3 +1,4 @@
+#if os(macOS)
 import SwiftUI
 
 public struct IconPreviews<Icon: View>: View {
@@ -20,3 +21,4 @@ public struct IconPreviews<Icon: View>: View {
     .fixedSize()
   }
 }
+#endif

Sources/AppIconCreator/IconView.swift

@@ -14,9 +14,11 @@ public struct IconView: View, Equatable {
 
 struct IconView_Preivews: PreviewProvider {
   static var previews: some View {
+    #if os(macOS)
     IconPreviews(
       icon: IconView(),
       configs: .iOS
     )
+    #endif
   }
 }