I can't choose iOS simulator as destination when I run my project in Xcode.

Hey there,
Several days ago, I reinstalled my Xcode 6 for some reason. Since then, I can no longer run my apps on a simulator.
I tried following steps to solve the problems, but none of them work.
* I deleted my Xcode and reinstalled it from the App Store.
* I changed my project's "Deployment Info" -> "Deployment Target" to 8.1, 8.0, 7.1, 7.0, 6.1, 6.0, none of them worked.
* I download the 7.1 simulator from Xcode -> Preference -> Download, and change the Deployment Target again, nothing happened.
* I clear the download caches in ~/Library/Caches/Xcode, I knew it won't make any difference, but just in case, still, nothing changed.
I launch the simulator from the Xcode -> Open Developer Tools -> iOS Simulator. The 8.1 simulator launch with a alert said "Unable to determine device."
NEED HELP!!!! THANK YOU!!!!
P.S.
* I'm using a macbook pro (15 inch, mid 2012).
* My laptop's OS version is 10.10.2.
* My Xcode version is 6.1.1 (6A2008a).
* My (Default) simulator version is 8.1 (550.3).
* I never ever use bootcamp. =D
Hey there,
Several days ago, I reinstalled my Xcode 6 for some reason. Since then, I can no longer run my apps on a simulator.
I tried following steps to solve the problems, but none of them work.
* I deleted my Xcode and reinstalled it from the App Store.
* I changed my project's "Deployment Info" -> "Deployment Target" to 8.1, 8.0, 7.1, 7.0, 6.1, 6.0, none of them worked.
* I download the 7.1 simulator from Xcode -> Preference -> Download, and change the Deployment Target again, nothing happened.
* I clear the download caches in ~/Library/Caches/Xcode, I knew it won't make any difference, but just in case, still, nothing changed.
I launch the simulator from the Xcode -> Open Developer Tools -> iOS Simulator. The 8.1 simulator launch with a alert said "Unable to determine device."
NEED HELP!!!! THANK YOU!!!!
P.S.
* I'm using a macbook pro (15 inch, 2012 mid).
* My laptop's OS version is 10.10.2.
* I never ever use bootcamp. =D

I finally solved this problem by open the Xcode -> Windows -> Devices and add a new simulator. It is said that Xcode 6 may have such a problem which is easy to fix.

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