参考文章 http://www.jianshu.com/p/df878cef6795

static NSString *kX = @"curveX";
static NSString *kY = @"curveY";

//粒子效果
 -(void)effectOfParticle{

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(self.bounds.size.width / 2 - 50, self.bounds.size.height / 2.0, 50, 50)];
     // view.backgroundColor = [UIColor yellowColor];
view.layer.cornerRadius = 50;
[self addSubview:view];

//create particle emmitter layer
//CAEmitterLayer负责发射粒子(粒子也可以发射粒子)
CAEmitterLayer *emitter = [CAEmitterLayer layer];
emitter.frame = view.bounds;
//决定粒子发射形状的中心点
emitter.emitterPosition = CGPointMake(100, 100);
emitter.emitterZPosition = 3.0;
emitter.emitterShape = kCAEmitterLayerCircle;//发射器形状
emitter.emitterMode = kCAEmitterLayerVolume;//3d圆形的体积内发射

emitter.preservesDepth = YES; //是否开启三维空间模式
emitter.emitterDepth = 2.0;//发射器的深度，有时可能会产生立体效果
emitter.spin = 50;//粒子的旋转角度
[view.layer addSublayer:emitter];

//configure emitter
emitter.renderMode = kCAEmitterLayerAdditive;//渲染模式
//emitter.emitterPosition = CGPointMake(emitter.frame.size.width /2.0, emitter.frame.size.height / 2.0);

//creat a particle template]
CAEmitterCell *cell = [[CAEmitterCell alloc] init];
cell.contents = (__bridge id _Nullable)([UIImage imageNamed:@"2.png"].CGImage);
cell.birthRate = 15.0;
cell.lifetime = 5.0;
cell.enabled = YES;//是否打开粒子的渲染效果
//  cell.color = [UIColor colorWithRed:1 green:0.5 blue:0.1 alpha:1.0].CGColor;
cell.alphaSpeed = -0.4;

cell.velocity = 50; //粒子的速度
cell.velocityRange = 70;//粒子的速度范围
cell.emissionRange = M_PI * 2.0;
//creat a particle template]
CAEmitterCell *cell2 = [[CAEmitterCell alloc] init];
cell2.contents = (__bridge id _Nullable)([UIImage imageNamed:@"2.png"].CGImage);
cell2.birthRate = 15.0;
cell2.lifetime = 5.0;
cell2.color = [UIColor colorWithRed:1 green:0.5 blue:0.1 alpha:1.0].CGColor;
cell2.alphaSpeed = -0.4;
cell2.velocity = 50;
cell2.velocityRange = 50;
cell2.emissionRange = M_PI * 2.0;
//add pareticle template to emitter
emitter.emitterCells = @[cell,cell2];

}