问题
I have developed an app that required iOS >= 4.0. But when I download it from App Store by using my iPod touch 2 (iOS 4.2.1), it says "This App Is Incompatible With This iPod touch". I don't know why. And when I use this iPod touch to run the app through Xcode, it also don't run on my iPod touch. How can I debug this error?
I have read this and my app build settings show that "Architectures" is "Standard(armv7)" and "Valid Architectures" is "armv6 armv7", I wondered if it's wrong.
回答1:
How to add support for iOS 4.2, armv6 in Xcode 4.2. I have tried to make this easy to follow.
Set your deployment target to 4.2 or earlier:
Modify Architectures to include armv6 like so:
1)Select Other,
2) Click on the "+" button,
3) Type in "armv6",
4) Click done.
Then remove armv7 from required device capabilities by clicking the "-" button in that row.
I personally use this method constantly to run apps on my iPod touch 2nd gen with the newest Xcode.(at this point Build 4D502).
In fact the project that I used for this example now runs on that iPod.
来源：https://stackoverflow.com/questions/8335500/this-app-is-incompatible-with-this-ipod-touch