Recently (today and yesterday) my simulators have begun to freeze every single time I open them. I'll start my app up, and within a minute, even less, the entire simulator freezes and I get the spinning wheel of death. If I wait it will unfreeze and do the task, only to freeze again seconds later.
If I restart my computer it'll work for maybe 5 minutes before freezing, same if I reset the simulator. However, it always goes back to freezing on me. This is extremely frustrating, as you can imagine!
I've searched Google but haven't found anything mentioning my problem. Has anyone had this happen to them before? It only freezes after use, and it seems like the Settings app is the main cause of this, usually when I open the settings is when I run into issues.
Does anyone have any ideas on how to fix this? Or what could possibly be going wrong with my simulators? I appreciate any help!
The "Window Snapping" feature in BetterTouchTool might cause this issue.
You could add the Simulator app in BTT, disable the scrolling & snapping feature for the simulator.
There is a known issue with Simulator.app causing periodic SPODs for some use cases in Xcode 7.0 and 7.1. The issue should be addressed in Xcode 7.2 beta.
If you see the issue in Xcode 7.2 beta or later, please take a sysdiagnose while the issue is reproducing, and file a radar at http://bugreport.apple.com
http://www.openradar.me/23504761 recommends to try turn off apps that use accessibility features.
Turning off Flexiglass fixed it for me
来源：https://stackoverflow.com/questions/33507202/xcode-7-1-simulators-constantly-freezing-when-i-use-them