Setting Instruments to Launch an iOS App in iOS Simulator
Launch your iOS app in iPhone or iPad Simulator by configuring an Instruments trace document. This approach is essential for some tests.
Build your iOS app in Xcode with iOS Simulator set as the run destination.
Choose your target in the Choose Target pop-up menu in the Instruments toolbar.
Select the simulator build of your app.
Select the simulator build of an iOS app to target it for launch in the iOS simulator by Instruments. The screenshot shows the process of dragging the app’s icon from a Finder window to the Instruments Choose Target dialog.