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苹果开发中文网站iOS多设备适配简史以及相应的API支撑实现
source link: http://www.cocoachina.com/ios/20190505/26904.html
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远古的iPhone3和iPhone4时代，设备尺寸都是固定3.5inch，没有所谓的适配的问题，只需要用视图的frame属性进行硬编码即可。随着时间的推移，苹果的设备种类越来越多，尺寸也越来越大，单纯的frame已经不能简单解决问题了，于是推出了AutoLayout技术和SizeClasses技术来解决多种设备的适配问题。一直在做iOS开发的程序员相信在下面的两个版本交界处需要处理适配的坎一定让你焦头烂额过：
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