Add app icon

ProcreateViewer/AppDelegate.swift

@@ -8,7 +8,9 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserInterfaceValidations {
     
     func validateUserInterfaceItem(_ item: NSValidatedUserInterfaceItem) -> Bool {
         if(item.tag == 67) {
-            return NSApplication.shared.keyWindow != nil
+            return NSApplication.shared.keyWindow
+                
+                != nil
         }
         
         return true

ProcreateViewer/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,53 +1,63 @@
 {
   "images" : [
     {
-      "idiom" : "mac",
       "size" : "16x16",
+      "idiom" : "mac",
+      "filename" : "untitled-16.png",
       "scale" : "1x"
     },
     {
-      "idiom" : "mac",
       "size" : "16x16",
+      "idiom" : "mac",
+      "filename" : "untitled-32.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "mac",
       "size" : "32x32",
+      "idiom" : "mac",
+      "filename" : "untitled-32.png",
       "scale" : "1x"
     },
     {
-      "idiom" : "mac",
       "size" : "32x32",
+      "idiom" : "mac",
+      "filename" : "untitled-64.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "mac",
       "size" : "128x128",
+      "idiom" : "mac",
+      "filename" : "untitled-128.png",
       "scale" : "1x"
     },
     {
-      "idiom" : "mac",
       "size" : "128x128",
+      "idiom" : "mac",
+      "filename" : "untitled-256.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "mac",
       "size" : "256x256",
+      "idiom" : "mac",
+      "filename" : "untitled-256.png",
       "scale" : "1x"
     },
     {
-      "idiom" : "mac",
       "size" : "256x256",
+      "idiom" : "mac",
+      "filename" : "untitled-512.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "mac",
       "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "untitled-512.png",
       "scale" : "1x"
     },
     {
-      "idiom" : "mac",
       "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "untitled-1024.png",
       "scale" : "2x"
     }
   ],