1 //需要实例化的个数
 2         int numofInstance = 10;
 3         //动画时长
 4         CGFloat duration = 1.0f;
 5         //创建repelicator对象
 6         CAReplicatorLayer *repelicator = [CAReplicatorLayer layer];
 7         //设置其位置
 8         repelicator.frame = self.view.bounds;
 9         //需要生成多少个相同实例
10         repelicator.instanceCount = numofInstance;
11         //代表实例生成的延时时间;
12         repelicator.instanceDelay = duration / numofInstance;
13         //设置每个实例的变换样式
14         repelicator.instanceTransform = CATransform3DMakeRotation(M_PI * 2.0 / 10.0, 0, 0, 1);
15
16         //创建repelicator对象的子图层，repelicator会利用此子图层进行高效复制。并绘制到自身图层上
17         CALayer *layer = [CALayer layer];
18         //设置子图层的大小位置
19         layer.frame = CGRectMake(0, 0, 10, 10);
20         //子图层的仿射变换是基于repelicator图层的锚点，因此这里将子图层的位置摆放到此锚点附近。
21         CGPoint point = [repelicator convertPoint:repelicator.position fromLayer:self.view.layer];
22         layer.position = CGPointMake(point.x, point.y - 20);
23         //设置子图层的背景色
24         layer.backgroundColor = [UIColor whiteColor].CGColor;
25         //将子图层切圆
26         layer.cornerRadius = 5;
27         //将子图层添加到repelicator上
28         [repelicator addSublayer:layer];
29         //对layer进行动画设置
30         CABasicAnimation *animaiton = [CABasicAnimation animation];
31         //设置动画所关联的路径属性
32         animaiton.keyPath = @"transform.scale";
33         //设置动画起始和终结的动画值
34         animaiton.fromValue = @(1);
35         animaiton.toValue = @(0.1);
36         //设置动画时间
37         animaiton.duration = duration;
38         //设置动画次数
39         animaiton.repeatCount = INT_MAX;
40         //添加动画
41         [layer addAnimation:animaiton forKey:nil];

 1 - (CAEmitterLayer *)emitter {
 2     if (_emitter == nil) {
 3         //创建粒子图层容器
 4         CAEmitterLayer *layer = [CAEmitterLayer layer];
 5         //设置发射器位置
 6         layer.emitterPosition = self.view.center;
 7         //设置发射器范围
 8         layer.emitterSize = CGSizeMake(50, 30);
 9         //设置发射器形状
10         layer.emitterShape = kCAEmitterLayerLine;
11         //设置发射器发射模式
12         layer.emitterMode = kCAEmitterLayerSurface;
13         //设置发射器的渲染模式
14         layer.renderMode = kCAEmitterLayerAdditive;
15
16         _emitter = layer;
17     }
18     return _emitter;
19 }

 1 //创建粒子
 2     CAEmitterCell *cell = [CAEmitterCell emitterCell];
 3     //配置粒子图像
 4     cell.contents = (__bridge id)[UIImage imageNamed:@"火焰"].CGImage;
 5     //粒子每秒发射个数
 6     cell.birthRate = 400;
 7     //粒子生命周期
 8     cell.lifetime = 3.0;
 9     //粒子旋转角度
10     cell.spin = M_PI / 2;
11     //粒子颜色
12     cell.color = [UIColor colorWithRed:1.000 green:0.681 blue:0.178 alpha:1.000].CGColor;
13     //粒子衰减过程
14     cell.alphaSpeed -= 1;
15     //粒子发射速度
16     cell.velocity = 40;
17     //粒子发射速度可变范围,如果此处设置为10 则速度值在30 - 50 之类变动
18     cell.velocityRange = 10;
19     //粒子缩放比例
20     cell.scaleSpeed -= 1;
21     //cell发射角度范围
22     cell.emissionLongitude =  0;
23     //cell发射偏转角度
24     cell.emissionRange = M_PI / 4;
25     //将配置好的粒子放入容器中
26     self.emitter.emitterCells = @[cell];