CAEmitterCell

//

 

        

     CAEmitterLayer * emitter = [CAEmitterLayer layer];

    //视图大小

    emitter.frame =  self.weakView.bounds;

   //加入视图中

   [self.weakView.layer addSublayer:emitter];

 

 // emitter.renderMode = kCAEmitterLayerAdditive;//重叠模式

       //粒子散发位置中心

    emitter.emitterPosition = CGPointMake(emitter.frame.size.width / 2.0, emitter.frame.size.height / 2.0);

 

CAEmitterCell * cell = [[CAEmitterCell alloc]init];

        //图片

    cell.contents = (__bridge id)[UIImage imageNamed:@"success_star"].CGImage;

    cell.birthRate = 50;

    cell.lifetime = 5.0;

    cell.color = [UIColor yellowColor].CGColor;

    cell.alphaSpeed = -0.4;

    cell.velocity = 50;//速度

    cell.velocityRange = 50;

    cell.emissionRange = M_PI * 2.0;

 

 

    CAEmitterCell * cell1 = [[CAEmitterCell alloc]init];

    

    //  cell.contents

    UIImage * image =imageWithColor([UIColor redColor]);

    

    UIImage *borderImg =imageWithColor([UIColor yellowColor]);

    

    UIImage * a  =[self imageWithIconName:image borderImage:borderImg border:3];

    cell1.contents= (__bridge id)a.CGImage;

    cell1.birthRate = 50;

    cell1.lifetime = 5.0;

    cell1.color = [UIColor yellowColor].CGColor;

    cell1.alphaSpeed = -0.4;

    cell1.velocity = 150;

    cell1.velocityRange = 50;

    cell1.emissionRange = M_PI * 2.0;

    

    self.imageView.image=imageWithColor([UIColor redColor]);

    //add particle template to emitter

    emitter.emitterCells = @[cell,cell1];//可以多个

//改变边缘图像

- (UIImage*)imageWithIconName:(UIImage*)image borderImage:(UIImage * )borderImg border:(int)border{

    //头像图片

    //    UIImage * image = [UIImage imageNamed:icon];

    //边框图片

    // UIImage * borderImg = [UIImage imageNamed:borderImage];

    //

    CGSize size = CGSizeMake(image.size.width + border, image.size.height + border);

    

    //创建图片上下文

    UIGraphicsBeginImageContextWithOptions(size, NO, 0);

    

    //绘制边框的圆

    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextAddEllipseInRect(context, CGRectMake(0, 0, size.width, size.height));

    

    //剪切可视范围

    CGContextClip(context);

    

    //绘制边框图片

    [borderImg drawInRect:CGRectMake(0, 0, size.width, size.height)];

    

    //设置头像frame

    CGFloat iconX = border / 2;

    CGFloat iconY = border / 2;

    CGFloat iconW = image.size.width;

    CGFloat iconH = image.size.height;

    

    //绘制圆形头像范围

    CGContextAddEllipseInRect(context, CGRectMake(iconX, iconY, iconW, iconH));

    

    //剪切可视范围

    CGContextClip(context);

    

    //绘制头像

    [image drawInRect:CGRectMake(iconX, iconY, iconW, iconH)];

    

    //取出整个图片上下文的图片

    UIImage *iconImage = UIGraphicsGetImageFromCurrentImageContext();

    

    return iconImage;

}

 //颜色形成图片

UIImage *imageWithColor(UIColor *color)

{

    CGRect rect = CGRectMake(0, 0, 13, 17);

    UIGraphicsBeginImageContext(rect.size);

    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [color CGColor]);

    CGContextFillRect(context, rect);

    

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}