话不多说，项目改版，旧的功能需要移除，拆分出来记录一下以便需要时回顾。
https://github.com/tyjlp/throwingCoin_CAEmitterLayer.git
-(void)startAnimationWithLayer:(CALayer*)superLayer{
//初始化粒子发射器
[self initEmitterLayerWithSuperLayer:superLayer];
CABasicAnimation * effectAnimation = [CABasicAnimation animationWithKeyPath:@"emitterCells.zanShape.birthRate"];
effectAnimation.fromValue= [NSNumbernumberWithFloat:30];
effectAnimation.toValue= [NSNumbernumberWithFloat:0];
effectAnimation.duration=2.0f;
effectAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
effectAnimation.delegate=self;
[self.emitterLayeraddAnimation:effectAnimationforKey:@"zanCount"];
//
[self playSoundWithSoundName:@"签到金币音效.mp3"];
}
-(void)initEmitterLayerWithSuperLayer:(CALayer*)superLayer{
//发射源
CAEmitterLayer * emitter = [CAEmitterLayer layer];
emitter.frame = CGRectMake(0, 0, kScreenWidth, kScreenHeight);
[superLayeraddSublayer:self.emitterLayer= emitter];
//发射源形状
emitter.emitterShape = kCAEmitterLayerCircle;
//发射模式
emitter.emitterMode = kCAEmitterLayerOutline;
//渲染模式
// emitter.renderMode = kCAEmitterLayerAdditive;
//发射位置
emitter.emitterPosition = CGPointMake(emitter.frame.size.width/2, emitter.frame.size.height/2);
//发射源尺寸大小
emitter.emitterSize=CGSizeMake(20,20);
// 从发射源射出的粒子
CAEmitterCell * cell = [CAEmitterCell emitterCell];
cell.name=@"zanShape";
//粒子要展现的图片
cell.contents= (__bridgeid)[UIImageimageNamed:@"coin"].CGImage;
// cell.contents = (__bridge id)[UIImage imageNamed:@"EffectImage"].CGImage;
// cell.contentsRect = CGRectMake(100, 100, 100, 100);
//粒子透明度在生命周期内的改变速度
cell.alphaSpeed= -0.5;
//生命周期
cell.lifetime=3.0;
//粒子产生系数(粒子的速度乘数因子)
cell.birthRate=0;
//粒子速度
cell.velocity=300;
//速度范围
cell.velocityRange = 100;
//周围发射角度
cell.emissionRange=M_PI/8;
//发射的z轴方向的角度
cell.emissionLatitude = -M_PI;
//x-y平面的发射方向
cell.emissionLongitude = -M_PI / 2;
//粒子y方向的加速度分量
cell.yAcceleration = 250;
emitter.emitterCells=@[cell];
}
