Cocoa ScreenSaverView - objective-c

Question

I am trying to play with ScreenSaverView in mac OS X.
I followed this tutorial http://cocoadevcentral.com/articles/000088.php
and it worked (can't say flawlessly ,but worked).
I also saw in part 2 of this tutorial they are playing with openGL stuff etc.
I have 2 general questions:
1)Can I use SprteKit within screensaver view?
2)What is wrong with my code here -> it compiles well, however I don't see anything except a black screen (I want to see my *.png).
- (instancetype)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview
{
self = [super initWithFrame:frame isPreview:isPreview];
if (self)
{
_imageView = [[NSImageView alloc]initWithFrame:[self bounds]];
[_imageView setImage:[NSImage imageNamed:#"SettingsButton.png"]];
[self addSubview:_imageView];
[self setAnimationTimeInterval:1.0];
}
return self;
}
EDIT: Attempt to use a draw rect:
- (void)drawRect:(NSRect)rect0
{
[super drawRect:rect0];
NSImage *anotherImage = [NSImage imageNamed:#"SettingsButton.png"];
[anotherImage drawAtPoint:NSMakePoint(10,100) fromRect:NSMakeRect(0,0,[anotherImage size].width,[anotherImage size].height) operation:NSCompositeCopy fraction:1.0];
// Calculate a random color
CGFloat red = SSRandomFloatBetween( 0.0, 255.0 ) / 255.0;
CGFloat green = SSRandomFloatBetween( 0.0, 255.0 ) / 255.0;
CGFloat blue = SSRandomFloatBetween( 0.0, 255.0 ) / 255.0;
NSColor* color = [NSColor colorWithCalibratedRed:red
green:green
blue:blue
alpha:1];
NSColor * color2 = [NSColor colorWithPatternImage:anotherImage];
[color2 set];
NSBezierPath * path = [NSBezierPath bezierPathWithRect:rect0];
[path fill];
}
When I set a color it works , I can see a screen filled by Random colors (fine as meant)
When I use color2 which is a pattern from the image
nothing is works :-( -> I tried different images
same nothing there...
I checked in build phase that I do copy the images as a bundle resources
What could be the problem ?
EDIT: Ok so after my attempt in drawRect I suspected that imageNamed method is causing a troubles and rewrite my origin attempt to:
- (instancetype)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview
{
self = [super initWithFrame:frame isPreview:isPreview];
if (self)
{
_imageView = [[NSImageView alloc]initWithFrame:[self bounds]];
NSBundle * tempBundle = [NSBundle bundleForClass:[self class]];
// Load your image, "top.tiff". Don't forget to release it when you are done (not shown).
NSImage * theImage = [[NSImage alloc] initWithContentsOfFile:
[tempBundle pathForImageResource:#"personal1.jpg"]];
[_imageView setImage:theImage];
[self addSubview:_imageView];
[self setAnimationTimeInterval:1.0];
}
return self;
}
And Whoaallaaa it worked !!(Kinda) I see my picture :-) !!!
As for part1 of the Question -> Yes it is possible
Just tried and it works !
with a little down side I can exit ScreenSaver only with cmd key xD
Managed to solve this issue,by subclassing SKView and delivering event to the next responder.
However it gave me a huge idea -> actually it just opens an opportunity to make a simple SK game as part of the screensaver could have been a cute feature.
Sadly I can't submit it to app store :)

Answer 1

It's not clear to me if a SpriteKit view (SKView) can even be used in a normal OSX/iOS app. I have searched in the past and found nothing.
If SpriteKit is anything like other game frameworks (from which it borrows much of its structure) then it will use a traditional game loop; i.e. clear screen, draw everything, wait a bit and then repeat.
Cocoa apps use an runloop that reacts to events and take steps to only redraw what needs to be redrawn.
So I would say "No" to your first question.
As far as your second, code-related, question is concerned, then I cannot see much wrong with it, however I am not familiar with that init method; what class does it subclass?