First version

boxattack/AppDelegate.m

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+#import "AppDelegate.h"
+#import "GameScene.h"
+
+@implementation SKScene (Unarchive)
+
++ (instancetype)unarchiveFromFile:(NSString *)file {
+    /* Retrieve scene file path from the application bundle */
+    NSString *nodePath = [[NSBundle mainBundle] pathForResource:file ofType:@"sks"];
+    /* Unarchive the file to an SKScene object */
+    NSData *data = [NSData dataWithContentsOfFile:nodePath
+                                          options:NSDataReadingMappedIfSafe
+                                            error:nil];
+    NSKeyedUnarchiver *arch = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
+    [arch setClass:self forClassName:@"SKScene"];
+    SKScene *scene = [arch decodeObjectForKey:NSKeyedArchiveRootObjectKey];
+    [arch finishDecoding];
+        
+    return scene;
+}
+
+@end
+
+@implementation AppDelegate
+
+@synthesize window = _window;
+
+- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
+    GameScene *scene = [GameScene unarchiveFromFile:@"GameScene"];
+
+    /* Set the scale mode to scale to fit the window */
+    scene.scaleMode = SKSceneScaleModeAspectFit;
+
+    [self.skView presentScene:scene];
+
+    /* Sprite Kit applies additional optimizations to improve rendering performance */
+    self.skView.ignoresSiblingOrder = YES;
+    
+    self.skView.showsFPS = YES;
+    self.skView.showsNodeCount = YES;
+}
+
+- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {
+    return YES;
+}
+
+@end