If I open Instruments and select a standard application (e.g. Mail or MS Word) it has no issue.
If I am in Xcode and I go to Product > Profile (or press Cmd + I), it launches Instruments, allows me to select a template, and loads the standard screen. Then the downward arrow starts tracing to the right as it should, and the iOS simulator launches the program. However, nothing is plotted in Instruments. It shows no changes to anything no matter what the app is doing. I can't click anything in Instruments: no menu's, can't stop recording, can't open tabs, etc.
I randomly discovered that if I hit Cmd + Tab, Instruments will start behaving normally. This seems really strange to me. Either it's a bug or it's a hole in my knowledge about how to operate Instruments.
XCode 4.2 中修复了奇怪的错误！
问题是隐藏的密码对话框，所以有时有效，有时无效。
可能的解决方案之一是：
- 运行仪器
- Cmd Tab 到 Xcode 覆盖仪器。循环并隐藏消息，直到找到密码对话框。
- 关闭 Xcode。
PS：我知道答案已经晚了几年，我只是在寻找未解答的问题。只需检查答案即可 - > 这对我们双方都有好处。 ）
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