改變背景移動速度

Question

在gameScene背景水平移動它工作正常，但我想移動背景緩慢和快速根據分數增加，我用nstimeinterval改變這種方式進行，但沒有我可以看到改變背景移動緩慢和快速其只是正常，如果這種方式是錯的，請別人幫我。

SKTexture *backgroundTexture = [SKTexture textureWithImageNamed:@"background10"]; 

    NSTimeInterval _move; 
     int _gameScore; 
    if (_gameScore>=5) { 
     _move =0.09; 
    }else{ 
     _move = 0.02; 
    } 

    SKAction *movBg = [SKAction moveByX:-backgroundTexture.size.width*2 y:0 duration:_move*backgroundTexture.size.width]; 
    SKAction *resetBg =[SKAction moveByX:backgroundTexture.size.width*2 y:0 duration:0]; 


    SKAction *movebackgroundforever =[SKAction repeatActionForever:[SKAction sequence:@[movBg,resetBg]]]; 
    for (int i= 0; i<2 + self.frame.size.width/(backgroundTexture.size.width*2); ++i) { 
     SKSpriteNode* sprite = [SKSpriteNode spriteNodeWithTexture:backgroundTexture]; 
     [sprite setScale:1.0]; 
     sprite.zPosition = -20; 
     sprite.anchorPoint = CGPointZero; 
     sprite.position = CGPointMake(i* sprite.size.width, 0); 
     [sprite runAction:movebackgroundforever]; 
     [_bgLayer addChild:sprite]; 

Answer 1

試試這個代碼：

將直接乘動畫時間與得分_move*__gameScore，你也可以提供一些intalize價值_move變量。

SKTexture *backgroundTexture = [SKTexture textureWithImageNamed:@"background10"]; 

NSTimeInterval _move; 


SKAction *movBg = [SKAction moveByX:-backgroundTexture.size.width*2 y:0 duration:_move*__gameScore]; 
SKAction *resetBg =[SKAction moveByX:backgroundTexture.size.width*2 y:0 duration:0]; 


SKAction *movebackgroundforever =[SKAction repeatActionForever:[SKAction sequence:@[movBg,resetBg]]]; 
for (int i= 0; i<2 + self.frame.size.width/(backgroundTexture.size.width*2); ++i) { 
    SKSpriteNode* sprite = [SKSpriteNode spriteNodeWithTexture:backgroundTexture]; 
    [sprite setScale:1.0]; 
    sprite.zPosition = -20; 
    sprite.anchorPoint = CGPointZero; 
    sprite.position = CGPointMake(i* sprite.size.width, 0); 
    [sprite runAction:movebackgroundforever]; 
    [_bgLayer addChild:sprite];