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iPad OS version history
source link: https://fann.im/blog/2012/07/10/ipad-os-version-history/
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iPad OS version history
Jul 10, 2012
iPad 的系统版本历史 (via iOS version history)：
- 3.2/3.2.1/3.2.2，iPad Only.
- 4.2/4.2.1
- 4.3.x
iPad 的系统版本并不是连续的，3.2 是上市时的版本，iPad 独享。iOS 里程碑 4.0 刚开始并不支持 iPad，直到 4.2 才支持。4.3 随 iPad 2 发布，之后的 iOS 都是全设备支持。
所以做 iPad App 时系统要求可以从 4.2 起步，为了兼容 3.2 的用户需要做很多处理，总体来说不值当。
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