自十年前 App Store 正式推出之时起，在每个程序包（.IPA）里都有应用图标文件，有各种规格用于适配 iPhone、iPad 以及高清屏等不同版本。
除此之外在正式发布应用时，也会要求提交在 App Store 上展示的图标，开始只要求提供 512x512 大小的图标，后来还要求提供 1024x1024 大小的图标。
有些应用图标赏心悦目，据传 Steve Jobs 要求图标做到能让他想用舌头去舔一下的水平。也有一些很粗糙，但总体来说各式各式都有可谓百花齐放。
小林特别喜欢分享 App 或音乐，经常第一时间分享。无论在微博还是朋友圈，贴出高清应用图标或者音乐封面，加上一些应用或音乐描述，感觉特别美好。
在 App Store 里是无法直接保存图标的，在网页上也隐藏很深，在电脑上下载 APP 后再解开封包更复杂，其实通过 iTunes Search API（https://affiliate.itunes.apple.com/resources/documentation/itunes-store-web-service-search-api/）也可以解决这个问题。
如搜索 QQ 出来的 JSON 结构里面，其中 artworkUrl512 字段正常就是最大的图标，不过还有更大的图片没有输出，可以自己替换成 1024x1024。
不过这种方法对非技术人员就不太友好了，但是不用灰心，你可以试试小林自己的小工具，长按识别二维码或者拷贝下方网址进去试试看，搜索出来之后点击图标既可下载 1024x1024 的图标或长按保存当前 512x512 的图标。
http://lxl.cn/tools/icon.php
QQ应用图标：
https://is3-ssl.mzstatic.com/image/thumb/Purple113/v4/8e/d1/f8/8ed1f820-fed3-5e64-e899-6816269880c9/source/1024x1024.jpg
微信应用图标：
https://is4-ssl.mzstatic.com/image/thumb/Purple124/v4/eb/b5/a8/ebb5a892-c161-c79f-ba51-2089219fb833/source/512x512bb.jpg
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