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苹果开发中文网站一步一步教你实现iOS音频频谱动画（一）
source link: http://www.cocoachina.com/ios/20190507/26914.html
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基于篇幅考虑，本次教程分为两篇文章，本篇文章主要讲述音频播放和频谱数据的获取，下篇将讲述数据处理和动画绘制。
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