升级XCode以确保它支持当前设备上的iOS版本。

(就我而言，我的手机使用的是iOS 9.1.x)但XCode版本是7，支持iOS 9.0设备)

改变你的部署目标并不是解决这个问题的好方法(它会改变你在应用商店中支持的iOS版本)。

我所做的就是重新启动Xcode，它就修复了。

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.

我同意txulu，改变部署目标是一个荒谬的想法。我需要支持设备回至少一个版本，这是不容讨价还价的我。

在更新到iOS 8.1和Xcode到6.1后重新启动我的iPhone 5对我来说很有效。

我的解决方案是，我最近将iOS设备升级到8.3，但Xcode仍然无法识别。修复方法是简单地将Xcode升级到6.3:)

请确保“设置”中的部署目标版本小于或等于iPhone版本

如果部署目标是7.1，但iPhone是7.0.3

您将看到错误消息