做项目的遇到这样一个需求，模仿微信的语音消息，点击以后有波纹扩散效果。

代码很简单 几句话就可以搞定，下面是代码：

UIImageView *voice = [[UIImageView alloc]initWithFrame:CGRectMake(40, 22.5, 15, 15)];
//动画未开始前的图片
voice.image = [UIImage imageNamed:@"chat_animation_white3"];
//进行动画效果的3张图片（按照播放顺序放置）
        voice.animationImages = [NSArray arrayWithObjects:
                                      [UIImage imageNamed:@"chat_animation_white1"],
                                      [UIImage imageNamed:@"chat_animation_white2"],
                                      [UIImage imageNamed:@"chat_animation_white3"],nil];
//设置动画间隔
        voice.animationDuration = 1;
        voice.animationRepeatCount = 0;
        voice.userInteractionEnabled = NO;
        voice.backgroundColor = [UIColor clearColor];
        
        [self.view addSubview:voice];