For most people the cause of the problem is probably mismatch between Xcode, device version and app target version. If versions are not a problem for you, most likely is that the device (iPhone/iPad) has been used with another Mac to copy apps to. This happens particularly more with a team environment where an iDevice can be used between team members. Xcode knows some other developer's Mac has connected to this device, it will show up as "Ineligible". But the previous Mac that connected to it, it will show up as normal. The quickest work around is as shown by joshstaiger among others: Go to Xcode ->Product->Destination Select the ineligible device as target. It should work.

这个问题最常见的原因是Xcode 6.3和在你的设备上运行iOS 8.2。Xcode 6.3默认不安装8.2模拟器。它安装了8.3模拟器。

@joshstaiger的解决方案是有效的，但它不是永久的解决方案。每次你想在你的设备上运行应用程序时，你都必须这样做

永久的解决方法是简单地在Xcode 6.3中安装8.2模拟器。点击Xcode ->首选项->下载。在Components下安装8.2模拟器。

现在您将不再看到您的设备列在不符合条件的设备下。

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)

有很多选项(这个问题有10 23 29个答案!)，都可能导致这个错误。没有人能100%解决这个问题。以下是所有解决方案的总结。

首先:

0. 更新到最新的Xcode版本 导致此问题的大部分原因在Xcode 6.3.1版本中修复(6D1002于2015年4月21日发布)

按出现频率排序的解决方案列表:

最有可能的解决方案是: 在Xcode状态下，进入:菜单栏->产品->目的地，找到你的设备。它将被列在不合格部分 选择您的设备。之后你就可以构建和部署到设备了!(谢谢,@joshstaiger)

如果不起作用:

iOS部署目标应该是设备版本的<=。 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。 如果版本正确-尝试同时重启Mac和iPhone/iPad。它在大多数情况下解决了这个问题!(谢谢,@HoaParis) 最后，如果这两种方法都不奏效，试试下面这个神奇的动作: 将iOS部署目标切换到8.1 重启Xcode 切换回所需的版本。

其他导致这个问题的问题:

Xcode Beta 6.3 does not support iOS 8.2 (and also 8.1). You won't see your iDevice in deploy target list. Use Xcode 6.2 instead of Xcode 6.3 beta in order to debug with an iDevice iOS 8.2 Xcode 6.3 requires Unity 4.6.4 If you're using an older Unity version (e.g. 4.6.3) you'll always get your devices in the Ineligible Devices section (thanks, @d4rk) Also it appears in case of changing name of Xcode project. The fix it - create a new scheme by selecting Manage Schemes > (+) button. (thanks, @dale-moore) Beta to Release upgrade of Xcode can require upgrading iOS or watchOS from beta to release version. For example, when switching from Xcode 8 beta 6 to Xcode 8 release, watchOS 3 beta is listed as unsupported.

对于iOS 9.1+设备，Xcode版本应该升级到7.1(甚至7.0x也不行)

我在“项目”和“目标”中设置了“iOS部署目标”，从7.1到8.0，重新启动Xcode(点击“退出”)，它工作了。