对我来说有用的是安装XCode 6.1(兼容iOS 8.1)

我的iPad是8.0，但我的部署目标设置为8.1。我在构建设置中更改了部署目标，ipad立即从“不合格”类别中移出。(我在Yosemite和XCode 6.1)

除了将iOS部署目标设置为iOS 8.0之外，还要重新启动你的iOS8 iPhone/iPad。这招对我很管用。

在使用Unity3D时也遇到了同样的问题

Xcode 6.3需要Unity 4.6.4

如果你使用的是较旧的Unity版本(例如4.6.3)，你的设备总是会出现在“非合格设备”部分

随着Xcode 6.3.1的发布，首先检查更新5

验证“iOS部署目标”是<=您的设备的版本。

当你在Xcode中点击项目的目标时，你会在“Build Settings”选项卡中找到这个选项。

Then if does not work, try to restart Xcode. Sometimes we have to restart the Mac and iPhone/iPad. Take a look at the Updates below before restarting Xcode Update: in Yosemite, Xcode 6.0.1 does not support iOS 8.1, you have to update to Xcode 6.1 if you want to debug on iOS 8.1 device, or you will probably have the same problem as described in the topic Update 2: Xcode Beta 6.3 does not support iOS 8.2 (and also 8.1 - thanks @steveb). You won't see your device in deploy target list. I don't know if other versions are supported. Update 3. Use Xcode 6.2 instead of Xcode 6.3 beta in order to debug with a device running iOS 8.2 Updated 4 : for Xcode 6.3 (and eventually 6.3 beta if someone use it :) ), if you have this problem, just go to Product > Destination to select your device. Even though it says your device is ineligible, it will still allow you to select it. If your device version is >= target version, the build should work. It must be a bug for Xcode 6.3 in debug with iOS 8.3 (or maybe other iOS version) (thanks @einfach).

更新5:苹果发布了Xcode 6.3.1，修复了不合格设备的问题。如果你在Xcode 6.3中遇到这个问题，请升级到Xcode 6.3.1

发布说明(Xcode 6.3.1):

固定:设备之前被列为“不符合运行条件” 错误的被正确列出。(20121178)

请检查您的设备iOS版本和您的Xcode应用程序构建目标版本。这可能就是问题所在。