如何在所有屏幕上为所有ios设备制作背景？

Question

我用SpriteHelper创建了Sprite Sheet。当我在spritehelper中创建背景时，图片大小为1920 x 1280.如何在所有屏幕中为所有设备制作背景。

  CGSize winSize = [CCDirector sharedDirector].winSize;

  CCSpriteBatchNode *sprites_for_game;      
  sprites_for_game = [CCSpriteBatchNode batchNodeWithFile:@"sprite_UntitledSheet.png"];

  [[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"sprite_UntitledSheet.plist"];
   [self addChild:sprites_for_game];
        CCSprite *sprite = [CCSprite spriteWithSpriteFrameName:@"background"];
        sprite.position = ccp(winSize.width/2,winSize.height/2);
        [sprites_for_game addChild:sprite];

iphone petina 3.5英寸 http://pixs.ru/showimage/Snimokekra_9096412_10672667.png

iphone petina 4.0英寸 http://pixs.ru/showimage/Snimokekra_8101239_10672678.png