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)

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。

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.

尝试了所有可能的更新，Xcode 6.3, iOS 8.3和OSX 10.10.3，但没有得到永久的解决方案。

向skywinder致敬，第一个选择成功了!

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。