Before for some reason, the Apple family's phone and pad products need to do a time-to-market sequencing, and analysis of what kind of CPU model
Summarized as follows:
ipad family:
1, iPad-2010.1.27 release
2, IPad 2-2011.3.3 released
3. IPad Mini-2012 released at the end of the year
4, IPad Air-2013.10.23 released
5, IPad mini2-2013.10.22 released
6, IPad air2-2014.10.17 released
7, IPad mini3-2014.10.16 released
8, IPad Pro-2015.9.10 released
9, IPad mini4-2015.9.10 released
10. IPad Pro (9.7 inch)-released 2016.3.21
11. IPad Fifth Generation-released 2017.3.23
12. IPad Pro (10.5 inches/12.9 inches)-released 2017.6.6
iphone family:
1, iPhone-2007.1.9 release
2. IPhone 3g-2008.6.9 Released
3. IPhone 3gs-2009.6.8 Released
4. IPhone 4-2010.6.7 Released
5. IPhone 4s-2011.10.4 Released
6. IPhone 5-2012.9.12 Released
7. IPhone 5s-2013.9.10 Released
8. IPhone 6-2014.9.9 Released
9. IPhone 6s-2015.9.9 Released
10, IPhone 7, 7 Plus-2016.9.7 released
11, IPhone 8, 8 Plus, X-2017.9 released
Among the 32-bit and 64-bit CPU processors:
The Iphone:iphone 5s (included) is followed by a 64-bit processor model.
Ipad:ipad Air (included) is followed by a 64-bit processor model.
enjoy~
Apple product time release table stats (IPhone, iPad), and instructions for 32-bit and 64-bit machines