如何从 iOS Swift 中的 waveformdata 对象绘制波形？

Question

[
  {
    "id": "48250",
    "created_at": "2014-07-06 13:05:10",
    "user_id": "7",
    "duration": "7376",
    "permalink": "shawne-back-to-the-roots-2-05072014",
    "description": "Years: 2000 - 2005\r\nSet Time: Warm Up (11 pm - 01 am)\r\n",
    "downloadable": "1",
    "genre": "Drum & Bass",
    "genre_slush": "drumandbass",
    "title": "Shawne @ Back To The Roots 2 (05.07.2014)",
    "uri": "https:\/\/api-v2.hearthis.at\/\/shawne-back-to-the-roots-2-05072014\/",
    "permalink_url": "http:\/\/hearthis.at\/\/shawne-back-to-the-roots-2-05072014\/",
    "artwork_url": "http:\/\/hearthis.at\/_\/cache\/images\/track\/500\/801982cafc20a06ccf6203f21f10c08d_w500.png",
    "background_url": "",
    "waveform_data": "http:\/\/hearthis.at\/_\/wave_data\/7\/3000_4382f398c454c47cf171aab674cf00f0.mp3.js",
    "waveform_url": "http:\/\/hearthis.at\/_\/wave_image\/7\/4382f398c454c47cf171aab674cf00f0.mp3.png",
    "user": {
      "id": "7",
      "permalink": "shawne",
      "username": "Shawne (hearthis.at)",
      "uri": "https:\/\/api-v2.hearthis.at\/shawne\/",
      "permalink_url": "http:\/\/hearthis.at\/shawne\/",
      "avatar_url": "http:\/\/hearthis.at\/_\/cache\/images\/user\/512\/06a8299b0e7d8f2909a22697badd7c09_w512.jpg"
    },
    "stream_url": "http:\/\/hearthis.at\/shawne\/shawne-back-to-the-roots-2-05072014\/listen\/",
    "download_url": "http:\/\/hearthis.at\/shawne\/shawne-back-to-the-roots-2-05072014\/download\/",
    "playback_count": "75",
    "download_count": "9",
    "favoritings_count": "7",
    "favorited": false,
    "comment_count": "0"
  }
]

这个Apireturns波形url和波形数据。如何转换波形数据以在波形url

中绘制类似于图像的波形

Api - https://hearthis.at/api-v2/

Answer 1

看起来 "data" 只是一连串的条形高度：

[136,132,133,133,138,...]

所以只需在这些高度（或与它们成比例的高度）绘制一连串条形。您可能需要每隔 n 个条绘制一次，或者可能需要将 n 个条的每个块平均在一起，以获得更整洁的表示（这就是他们在您指向的站点上所做的）。

如何从 iOS Swift 中的 waveformdata 对象绘制波形？

How to draw waveform from waveformdata object in iOS Swift?

iphone

avaudioplayer

ios

swift