Learn how to animate buttons, labels, imageView without creating bunch of classes PS：该文章正在掘金翻译计划（https://github.com/xitu/gold-miner）中翻译，大家可以持续关注掘金翻译计划以获取最新译文。千山万水总是情，来个 star 行不行？(◍•ᴗ•`◍)*＊