iOS粒子效果（雪花，烟花）

雪花

//雪花动画
- (void)animation1 {

    //粒子发射器
    CAEmitterLayer *snowEmitter = [CAEmitterLayer layer];
    //粒子发射的位置
    snowEmitter.emitterPosition = CGPointMake(100, 30);
    //发射源的大小
    snowEmitter.emitterSize     = CGSizeMake(self.view.bounds.size.width, 0.0);;
    //发射模式
    snowEmitter.emitterMode     = kCAEmitterLayerOutline;
    //发射源的形状
    snowEmitter.emitterShape    = kCAEmitterLayerLine;
    
    //创建雪花粒子
    CAEmitterCell *snowflake = [CAEmitterCell emitterCell];
    //粒子的名称
    snowflake.name = @"snow";
    //粒子参数的速度乘数因子。越大出现的越快
    snowflake.birthRate     = 1.0;
    //存活时间
    snowflake.lifetime      = 120.0;
    //粒子速度
    snowflake.velocity      = -10;              // falling down slowly
    //粒子速度范围
    snowflake.velocityRange = 10;
    //粒子y方向的加速度分量
    snowflake.yAcceleration = 2;
      //周围发射角度
    snowflake.emissionRange = 0.5 * M_PI;       // some variation in angle
    //子旋转角度范围
    snowflake.spinRange     = 0.25 * M_PI;      // slow spin
    //粒子图片
    snowflake.contents      = (id) [[UIImage imageNamed:@"DazFlake"] CGImage];
    //粒子颜色
    snowflake.color         = [[UIColor redColor] CGColor];
    
    //设置阴影
    snowEmitter.shadowOpacity = 1.0;
    snowEmitter.shadowRadius  = 0.0;
    snowEmitter.shadowOffset  = CGSizeMake(0.0, 1.0);
    snowEmitter.shadowColor   = [[UIColor whiteColor] CGColor];
    
    // 将粒子添加到粒子发射器上
    snowEmitter.emitterCells = [NSArray arrayWithObject:snowflake];
    [self.view.layer insertSublayer:snowEmitter atIndex:0];
}

烟花

//烟花动画
- (void)animation2 {
    // Cells spawn in the bottom, moving up
   
    //分为3种粒子，子弹粒子，爆炸粒子，散开粒子
    CAEmitterLayer *fireworksEmitter = [CAEmitterLayer layer];
    CGRect viewBounds = self.view.layer.bounds;
    fireworksEmitter.emitterPosition = CGPointMake(viewBounds.size.width/2.0, viewBounds.size.height);
    fireworksEmitter.emitterSize    = CGSizeMake(viewBounds.size.width/2.0, 0.0);
    fireworksEmitter.emitterMode    = kCAEmitterLayerOutline;
    fireworksEmitter.emitterShape   = kCAEmitterLayerLine;
    fireworksEmitter.renderMode     = kCAEmitterLayerAdditive;
    fireworksEmitter.seed = (arc4random()%100)+1;
    
    // Create the rocket
    CAEmitterCell* rocket = [CAEmitterCell emitterCell];
    
    rocket.birthRate        = 1.0;
    rocket.emissionRange    = 0.25 * M_PI;  // some variation in angle
    rocket.velocity         = 380;
    rocket.velocityRange    = 100;
    rocket.yAcceleration    = 75;
    rocket.lifetime         = 1.02; // we cannot set the birthrate < 1.0 for the burst
    
    //小圆球图片
    rocket.contents         = (id) [[UIImage imageNamed:@"DazRing"] CGImage];
    rocket.scale            = 0.2;
    rocket.color            = [[UIColor redColor] CGColor];
    rocket.greenRange       = 1.0;      // different colors
    rocket.redRange         = 1.0;
    rocket.blueRange        = 1.0;
    rocket.spinRange        = M_PI;     // slow spin
    
    
    
    // the burst object cannot be seen, but will spawn the sparks
    // we change the color here, since the sparks inherit its value
    CAEmitterCell* burst = [CAEmitterCell emitterCell];
    
    burst.birthRate         = 1.0;      // at the end of travel
    burst.velocity          = 0;        //速度为0
    burst.scale             = 2.5;      //大小
    burst.redSpeed          =-1.5;      // shifting
    burst.blueSpeed         =+1.5;      // shifting
    burst.greenSpeed        =+1.0;      // shifting
    burst.lifetime          = 0.35;     //存在时间
    
    // and finally, the sparks
    CAEmitterCell* spark = [CAEmitterCell emitterCell];
    
    spark.birthRate         = 400;
    spark.velocity          = 125;
    spark.emissionRange     = 2* M_PI;  // 360 度
    spark.yAcceleration     = 75;       // gravity
    spark.lifetime          = 3;
    //星星图片
    spark.contents          = (id) [[UIImage imageNamed:@"DazStarOutline"] CGImage];
    spark.scaleSpeed        =-0.2;
    spark.greenSpeed        =-0.1;
    spark.redSpeed          = 0.4;
    spark.blueSpeed         =-0.1;
    spark.alphaSpeed        =-0.25;
    spark.spin              = 2* M_PI;
    spark.spinRange         = 2* M_PI;
    
    // 3种粒子组合，可以根据顺序，依次烟花弹－烟花弹粒子爆炸－爆炸散开粒子
    fireworksEmitter.emitterCells   = [NSArray arrayWithObject:rocket];
    rocket.emitterCells             = [NSArray arrayWithObject:burst];
    burst.emitterCells              = [NSArray arrayWithObject:spark];
    [self.view.layer addSublayer:fireworksEmitter];
}

下载链接
https://pan.baidu.com/s/1dDPoeVR