Swift: SpriteKit not rendering sprites in correct size

Question

EDIT 3: Well, I've fixed this problem. It seems that with iOS 8 you can now load the scene from a scene.sks file. So in this case, the game was loading a .sks file that had a resolution of 1024x768. That's why the image was not displayed correctly. Changing the ViewController to work as it was prior to iOS 8 (here it is explained: Swift and Spritekit won't run on device running iOS 7.1) seems to solve the issue. Thanks to everyone who tried to help me. :D

I'm creating a game in SpriteKit and Swift (well, I'm porting a game I have already made in Obj-C) using the latest Xcode beta. I have a problem and it is that SpriteKit does not seem to render my sprites correctly, rendering them in a smaller size than what it should be. If I provide a background in the native iPhone resolution, adding it using this code:

    let background = SKSpriteNode(imageNamed: backgroundName)
    background.position = CGPoint(x: self.size.width / 2, y: self.size.height / 2)
    self.addChild(background)

Yields this:

SKFail

The sprite image is smaller than what it should be, as the image is 640x1136. Am I missing something?

EDIT: Well, it seems the images are rendered approximately 50% smaller. Making them a 50% bigger display them correctly but they have the wrong size (50% bigger)...

EDIT 2: Well, here's the proof that the images I'm using are at the correct resolution: enter image description here

If images are at half size on a retina screen, then you probably aren't labeling them as 2x, but if your image is only 640 by 1136 then it will be half the size of a retina screen since it has twice the pixels. Make sure you are distinguishing between points and pixels. — Cooper Buckingham, Jul 12 '14 at 18:17
@CHBuckingham The images are correctly placed at the xcassets folder. Also, points are in non-retina resolution, no? — José María, Jul 12 '14 at 19:23
I commented too quickly and assumed you were running on an iPad simulator resolution. A 640 by 1136 pixels image should fit the iPhone retina screen display correctly. So your source image either isn't that density or resolution, or your scene has a different size or scale. — Cooper Buckingham, Jul 12 '14 at 20:09
@CHBuckingham How do I check or change the Scene size or scale? — José María, Jul 12 '14 at 20:48
The scene should have a property for xScale and yScale, and a self.size.width and self.size.height. — Cooper Buckingham, Jul 12 '14 at 23:13
What is a value of `backgroundName`? Make sure it doesn't contain file extension at the end of the file name — Andrey Gordeev, Jul 13 '14 at 04:14
@AndreyGordeev the value of backgroundName is randomly chosen using a switch statement and arc4random_uniform. And no, it doesn't have the extension. — José María, Jul 13 '14 at 09:42
@CHBuckingham OK, but if you don't specify them in the code, they have default values, no? — José María, Jul 13 '14 at 09:42
@CHBuckingham Well, I've found the problem. I have the game as a universal binary (iPad and iPhone). The size of the scene is 1024x768, the size of the iPad display. That's why the image doesn't display correctly. How can I adjust the size so it has the correct resolution on the iPhone 3.5" and 4" displays? — José María, Jul 13 '14 at 09:46

score 1 · Answer 1 · answered Jul 17 '14 at 05:40

I ran into the same problem. You must declare your texture once and only once, then load it in each sprite. If you println("sprite:\(sprite)") your sprites you'll see the texture is missing.

class test : SKSpriteNode
{
    let textureImage = SKTexture(imageNamed:"spriteImage")


    func load sprites() {

        sprite = SKSpriteNode(texture: textureImage )
    }
}

score 1 · Answer 2 · answered Oct 13 '15 at 05:00

All you need to do to make it the same size is this (in didMoveToView):

self.size = view.frame.size // makes the size of the scene the same size as the frame, idk
let background = SKSpriteNode(imageNamed: "background") // if you actually need this tho
background.size = self.frame.size

score 0 · Answer 3 · answered Jul 12 '14 at 17:22

0

Make sure that your scene isn't scaled or setup in some odd manner. My tests with the latest xcode/spritekit work with an image that size.

answered Jul 12 '14 at 17:22

dylanrw

1
3

Hmm, nope it does not seem to b scaled as far at that I can look in the code. Also, the image is correctly stored in the xcassets folder so I don't know what can be the problem – José María Jul 12 '14 at 17:34

Swift: SpriteKit not rendering sprites in correct size

3 Answers3