Using sprite sheets in xcode

Question

I\'m trying to animate my game using a sprite sheet. How would I go about cutting out each sprite from the sprite sheet and using the sprite in xcode? I\'m currently using o

Answer 1

I did a fix for getting sprites from top to bottom, left to right.

Also added a totalFrames so if you don't have a sprite with all frames, you can set the total frames so the array only contains the sprites, no blank sprites.

//
//  SpriteSheet.swift
//

import SpriteKit

class SpriteSheet {
    let texture: SKTexture
    let rows: Int
    let columns: Int
    var margin: CGFloat=0
    var spacing: CGFloat=0
    var frameSize: CGSize {
        return CGSize(width: (self.texture.size().width-(self.margin*2+self.spacing*CGFloat(self.columns-1)))/CGFloat(self.columns),
                  height: (self.texture.size().height-(self.margin*2+self.spacing*CGFloat(self.rows-1)))/CGFloat(self.rows))
    }

    init(texture: SKTexture, rows: Int, columns: Int, spacing: CGFloat, margin: CGFloat) {
        self.texture=texture
        self.rows=rows
        self.columns=columns
        self.spacing=spacing
        self.margin=margin

    }

    convenience init(texture: SKTexture, rows: Int, columns: Int) {
        self.init(texture: texture, rows: rows, columns: columns, spacing: 0, margin: 0)
    }

    func textureForColumn(column: Int, row: Int)->SKTexture? {
        if !(0...self.rows ~= row && 0...self.columns ~= column) {
            return nil
        }
        var textureRect = CGRect(x: self.margin + CGFloat(column) * (self.frameSize.width+self.spacing)-self.spacing, y: self.margin + CGFloat(self.rows - row - 1) * (self.frameSize.height+self.spacing)-self.spacing,
                           width: self.frameSize.width,
                           height: self.frameSize.height)

        textureRect = CGRect(x: textureRect.origin.x/self.texture.size().width, y: textureRect.origin.y/self.texture.size().height,
                       width: textureRect.size.width/self.texture.size().width, height: textureRect.size.height/self.texture.size().height)
        return SKTexture(rect: textureRect, in: self.texture)
    }
}

To call, just add the animation like this:

fileprivate let framesOpening: [SKTexture] = {
    let totalFrames = 28
    let rows = 6
    let columns = 5
    let sheet = SpriteSheet(texture: SKTexture(imageNamed: "GETREADY"), rows: rows, columns: columns, spacing: 0, margin: 0)
    var frames = [SKTexture]()
    var count = 0

    for row in (0..

and call it

    let sprite1 = SKSpriteNode(texture: framesOpening.first)
    let openingAnimation: SKAction = SKAction.animate(with: framesOpening, timePerFrame: 0.2, resize: false, restore: true)
    sprite1.position = CGPoint(x: frame.midX, y: frame.midY)
    sprite1.zPosition = 2000
    self.addChild(sprite1)
    sprite1.run(SKAction.repeatForever(openingAnimation))