对我来说，这个问题是由于我的苹果全球开发者关系认证机构无效。

从这里下载: https://developer.apple.com/certificationauthority/AppleWWDRCA.cer

拖放到Keychain Access中，清理项目，然后运行。

重启Xcode就解决了这个问题。

我试了上面给出的所有答案，都没用。

终于工作后更新到优胜美地

我有一个Obj-C项目，我开始添加swift源文件。 以下为我解决了这个问题:

链接:RUNPATH SEARCH PATHS = $(inherited) @executable_path/Frameworks Swift编译器-代码生成:嵌入内容包含Swift = YES

我刚刚从Xcode 6.3模板创建了一个新项目，并将项目设置与旧的原始项目进行了比较。

发生这种情况的原因有很多。刚刚度过了一个有趣的周末，发现了另一个导致这个问题的问题(代码签名的顺序)，我想创建一个总结答案，将所有可能的解决方案放在一起:

Add Embedded Content Contains Swift Code to project. You need to set this flag if your app contains Swift code. Clean project. In addition to a Project > Clean you can also delete the DerivedData and Build directories. Look under the Preferences for the location of DerivedData. Build should be in your project folder. Ensure Runpath Search Paths contains @executable_path/Frameworks. Ensure that your certificate contains your Apple Team ID in the OU (Organization Unit) field Apple will add this for you, just revoke your existing distribution certificate and create a new one, download, install on KeyChain, regenerate all provisioning profiles, download those and rebuild. Xcode restart. If everything is basically good, but Xcode hasn't gotten there yet.

这很简单。如果你正在进行自己的命令行构建，你可能会创建自己的.ipa文件来上传。在这种情况下，您需要确保以下内容:

Make sure the version of the Swift files in SwiftSupport/iphoneos is the same as the version in Contents/YourApp.app/Frameworks Because Swift is not yet binary compatible between version, you must ensure these versions are the one that you built your app with. You can find these libraries under /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos. Sign the libraries and frameworks first. You need to codesign the libraries and framework files (under Frameworks in the .app folder) first and then sign the entire .app tree. The .app tree must be signed with an entitlements.plist but not the frameworks.

希望当Swift 3.0问世时，我们不再需要将Swift捆绑到我们的应用程序中，这个问题就会消失。

我真的不知道为什么这个问题被否决了，当我第一次尝试在一个现有的项目中使用Swift时，我也遇到了这个问题。Xcode重启也为我解决了这个问题。