Background:
Xcode is a one-stop development app for OSX and iOS devices, including all Macintosh Desktops, laptops, iPhones, iPads, and iPod touch.
Note: I Assume you are on OSX Yosemite 10.10.3 or the Latest Operating System & Xcode 6 or later installed.
With the release of Xcode 6 and later, while developing and running your iOS app in iOS Simulator on your Mac, you may encounter a bug like this: ‘Unable to boot iOS Simulator’ with a blank screen.

Here is how to fix it
Solution 01:
Select iOS Simulator, then go to top Menubar > iOS Simulator > Reset Content and Settings > Reset (On command prompt, press reset)
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