iOS 离子发射器运用

https://github.com/imwcl/WclEmitterButton

.h

//两种不同的CAEmitterLayer
@property (strong, nonatomic) CAEmitterLayer *explosionLayer;

/**
 *  开始喷射
 */
- (void)startAnimate;

/**
 *  停止喷射
 */
- (void)stop;

- (void)destroy;

.m

/*
 CAKeyframeAnimation       // 核心动画-关键帧动画
 CAEmitterLayer            // 粒子发射器(其实就是一个Layer,其父类是CALayer)
 CAEmitterCell             // 粒子
 PS:核心动画应该不用多说了;
 CAEmitterLayer和CAEmitterCell，其实可以比喻成“炮”和“炮弹”,应该不难理解;
 */

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self setup];
    }
    return self;
}

/**
 *  配置WclEmitterButton
 */
- (void)setup {
    //参数详情请见博客详解：http://blog.csdn.net/wang631106979/article/details/51258020
    CAEmitterCell *explosionCell = [CAEmitterCell emitterCell];
    explosionCell.name           = @"explosion";
    explosionCell.alphaRange     = 0.50;// 一个粒子的颜色alpha能改变的范围
    explosionCell.alphaSpeed     = -0.7;// 粒子透明度在生命周期内的改变速度
    explosionCell.lifetime       = 5;// 生命周期
    explosionCell.lifetimeRange  = 1;// 生命周期范围 lifetime= lifetime(+/-) lifetimeRange
    explosionCell.birthRate      = 0;// 每秒发射的粒子数量
    explosionCell.velocity       = 10.00;// 速度
    explosionCell.velocityRange  = 1500.00;// 速度范围
    explosionCell.scale          = 0.8;// 缩放比例
    explosionCell.scaleRange     = 0.4;// 缩放比例范围
    explosionCell.contents       = (id)[UIImage imageNamed:@"scene_finish_fly_star.png"].CGImage;// 是个CGImageRef的对象,既粒子要展现的图片
    
    _explosionLayer               = [CAEmitterLayer layer];
    _explosionLayer.name          = @"emitterLayer";
    _explosionLayer.emitterShape  = kCAEmitterLayerCircle;// 发射源的形状
    _explosionLayer.emitterMode   = kCAEmitterLayerOutline;// 渲染模式
    _explosionLayer.emitterSize   = CGSizeMake(30, 0);// 发射源的大小
    _explosionLayer.emitterCells  = @[explosionCell];// 粒子发射的粒子的数组
    _explosionLayer.renderMode    = kCAEmitterLayerOldestFirst;// 渲染模式
    _explosionLayer.masksToBounds = NO;// 是否圆角
    _explosionLayer.position      = CGPointMake(self.frame.size.width/2.0, self.frame.size.height/2.0);// 位置
    _explosionLayer.zPosition     = -1; // z轴位置
    [self.layer addSublayer:_explosionLayer];
}

/**
 *  开始喷射
 */
- (void)startAnimate {
    //explosionLayer开始时间
    self.explosionLayer.beginTime = CACurrentMediaTime();
    //explosionLayer每秒喷射的个数
    [self.explosionLayer setValue:@40 forKeyPath:@"emitterCells.explosion.birthRate"];
}

/**
 *  停止喷射
 */
- (void)stop {
    //explosionLayer每秒喷射的0个
    [self.explosionLayer setValue:@0 forKeyPath:@"emitterCells.explosion.birthRate"];
}

- (void)destroy {
    [self stop];
}