【背景】
需要去搞清楚，Swift代码能否在旧版本的iPhone上运行。
【折腾过程】
1.搜：
Swift代码能在旧版本的iPhone上运行吗
参考：
新手不太懂，编译swift不是要iOS SDK 8.0才可以吗？那编出来的App能在iOS6及以下运行吗？
对苹果“五仁”编程语言Swift的简单分析 – Proteas的专栏 – 博客频道 – CSDN.NET
2.搜：
Swift run on old ios device
参考：
Will Swift Apps Work on Older iPhones? | One Month
“
Apple’s release of Swift 1.0, has sparked the question:
"Will older iPhones be able to run Swift apps?"
The short answer is yes. But there’s a bit more to it than that.
Will Old Hardware Support Swift?
Yes, as long as you have one of the following you’re good:
- iPhone 6, iPhone 6 Plus
- iPhone 5S, iPhone 5C, iPhone 5
- iPhone 4S, iPhone 4
- 4th Generation iPad, 3rd Generation iPad, iPad 2
- 5th generation iPod touch
Will Old Software Support Swift?
Yes, Swift will support the following operating systems…
iPhone/iPad:
- iOS 7 (current)
- iOS 8 (upcoming)
Mac:
- OS X Mavericks (current)
- OS X Yosemite (upcoming)
What % of People Will Have Trouble?
I’ve got good news… statistically, most people have already upgraded to at least iOS7!
Here’s the raw stats:
- 92% of iOS devices are running iOS 7 right now.
- OS X Mavericks is expected to be running on over 70% of Macs
In Conclusion
Apple put quite a lot of effort to make sure Swift would be fully compatible with the majority of devices. This is a great sign and a big win for Swift.
”
osx – Do Swift-based applications work on OS X 10.9/iOS 7 and lower? – Stack Overflow
“
iOS 7 and OS X 10.9 minimum deployment target
The Swift compiler and Xcode now enforce a minimum deployment target of iOS 7 or OS X Mavericks. Setting an earlier deployment target results in a build failure.
http://adcdownload.apple.com//Developer_Tools/xcode_6_beta_4_o2p8fz/xcode_6_beta_4_release_notes.pdf
So my previous answer(Shown below) will not be applicable to any further development. Swift will no longer available for iOS6 and below ”
【总结】
简答：
可以的。
因为是会，针对旧的iOS设备，会在生成可执行文件时打包相应的库函数的。是编译为二进制的。
所以理论上旧的设备都是可以运行的。
详解：
基于目前绝大多数（92%）的iOS设备都已经升级到iOS7了，而Swift支持iOS7和iOS8，所以可以说成是：
目前针对于绝大部分的iOS设备，都可以正常的运行Swift，没有任何问题。
另：
桌面版的OS X：目前多数Mac设备都是OS X Mavericks或更新设备了，而Swift支持OS X Mavericks和OS X Yosemite，所以也是：
目前多数的Mac桌面端设备都支持Swift。
转载请注明：在路上 » 【整理】Swift代码能在旧版本的iPhone上运行吗