sprite kit - Moving Background Swift SKSpriteKit -


i'm working on application i'm trying set moving background. have transparent image full of clouds i'm using. problem is, how can make move more smoother? i've tried play speeds still looks laggy. blessing.

here's video of got going. http://sendvid.com/78ggkzcj

and here's picture of cloud image. cloud image

here's code. think should change or differently? 

class gamescene: skscene {      // background     let background = skspritenode(texture:sktexture(imagenamed: "background"))      // clouds     var maincloud = skspritenode()     var cloud1next = skspritenode()      // time of last frame     var lastframetime : timeinterval = 0      // time since last frame     var deltatime : timeinterval = 0      override func didmove(to view: skview) {         background.position = cgpoint(x: 0, y: 0)          // prepare clouds sprites         maincloud = skspritenode(texture:             sktexture(imagenamed: "cloudbg1"))         maincloud.position = cgpoint(x: 0, y: 0)          cloud1next = maincloud.copy() as! skspritenode         cloud1next.position =             cgpoint(x: maincloud.position.x + maincloud.size.width,                     y: maincloud.position.y)          // add sprites scene         self.addchild(background)         self.addchild(maincloud)         self.addchild(cloud1next)     }      override func update(_ currenttime: timeinterval) {         // called before each frame rendered         // first, update delta time values:          // if don't have last frame time value, first frame,         // delta time zero.         if lastframetime <= 0 {             lastframetime = currenttime         }          // update delta time         deltatime = currenttime - lastframetime          // set last frame time current time         lastframetime = currenttime          // next, move each of 4 pairs of sprites.         // objects should appear move slower foreground objects.         self.movesprite(sprite: maincloud, nextsprite:cloud1next, speed:100)     }      // move pair of sprites leftward based on speed value;     // when either of sprites goes off-screen, move     // right appears seamless movement     func movesprite(sprite : skspritenode,                     nextsprite : skspritenode, speed : float) -> void {         var newposition = cgpoint.zero          // both sprite , duplicate:         spritetomove in [sprite, nextsprite] {              // shift sprite leftward based on speed             newposition = spritetomove.position             newposition.x -= cgfloat(speed * float(deltatime))             spritetomove.position = newposition              // if sprite offscreen (i.e., rightmost edge             // farther left scene's leftmost edge):             if spritetomove.frame.maxx < self.frame.minx {                  // shift on it's immediate right                 // of other sprite.                 // means 2 sprites                 // leap-frogging each other both move.                 spritetomove.position =                     cgpoint(x: spritetomove.position.x +                         spritetomove.size.width * 2,                             y: spritetomove.position.y)             }         }     } }

your code looks fine. getting low fps because running game in simulator. if run on real device, should smooth.


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