我尝试了这个页面中的所有方法，对我有效的“新”解决方案是进入模拟器，在iOS模拟器主菜单中“重置内容和设置”。

I was having this very annoying issue since a long time too. I've 3 different XCode versions installed and I'm not sure whether it's the reason or not that none of the above solutions worked for me. But here is the solution I finally found: I don't kill the running Simulator, I just try to launch it again using a Spotlight search, enter "Simu" and you should find it in Applications, then hit Enter. As it's yet running it will magically start my app that was frozen/locked/waiting for attachment. It works perfectly for me now and I hope it will also work for some (all?) of you.

顺便说一句，我用Cmd+空格来调用Spotlight，这样就可以非常快速地解冻模拟器而不使用鼠标。

这里给出的答案没有一个对我有帮助。

我在“编辑方案/信息”部分设置了“启动”单选按钮，以“等待MyApp”。而不是默认的“自动”。

它停止悬挂，现在它不启动模拟器，并在窗帘后面的日志中跟踪以下内容:

error: attach by name 'MyApp' failed
unable to create lldb_private::Process

在尝试谷歌它之后，这个错误似乎是一个相当罕见的。

我不期望这个错误适用于这里的所有情况，但无论如何，我希望我的帖子将为讨论的问题添加一些额外的细节。

Xcode: 4.4.1版本(4F1003)

固定它! !希望这能帮助一些人避免非常沮丧的几个小时。我用以下方法解决了这个问题:

Clicking on the project name in the left pane (at the very top). This will bring up a new menu to the right, something like the project/ target editors in XCode 3. Click on Build Settings up at the top. Under Packaging make sure your product name is the same for every build, and equal to whatever it says it's attaching to. Eg if XCode is Hanging at "Attaching to myLCBO" but your product name is "LCBO Finder" then it won't build. That was exactly my problem because I renamed my app half way through development.

就像Rob说的，还要检查“标识符”默认应该是“com.yourcompany”。我错误地更改了“yourcompany”，这导致了上面提到的相同问题。

我是如何解决这个问题的:

1) iOS模拟器->重置内容和设置…

2)确保项目名称、方案名称和目标名称一致。“AppName”和“AppName”不为真。必须为“AppName”+“AppName”，或者“AppName”+“AppName”。

3)重启XCode并退出模拟器。

生成设置中的项目名称->产品名称。

Product->中的方案名称管理方案。单击当前方案一次以重命名。

有目标的项目列中的目标名称。在当前目标上单击一次以重命名。

祝你好运=)