![]() You can perform these steps using your own iOS app or, if you do not have an app to use, with the HelloWorld sample code. The chapter presents the basics of using Simulator. You interact with Simulator by using the keyboard and the mouse to emulate taps, device rotation, and other user actions. Simulator app, available within Xcode, presents the iPhone, iPad, or Apple Watch user interface in a window on your Mac computer. For Xcode 9 and later, see Simulator Help by choosing Help > Simulator Help in Simulator. Therefore always test on the real device when we have computation heavy tasks at hand.The information in this document is deprecated in Xcode 9. While cool, this might make things go well on the simulator, but lag on the real device (because now we can have better performance in the mac). The talk ends with an overview of Metal being available to the simulator and reasons why it is awesome, for us we will see all the places where we use it (a.k.a. $ xcrun simctl delete unavailable removes all simulators that are not available any longer (old Xcode installs).e.g: $ xcrun simctl launch -console-pty booted -MyDefaultKey YES launches the app, connect the logs to the terminal, writes the usersDefault value true for key “MyDefaultKey”.$ xcrun simctl launch launches the app.$ xcrun simctl diagnose captures logs and states useful especially on CI when a test fails.$ xcrun simctl spawn lets you launch and change the simulator behavior (logs, inject user defaults.).$ xcrun simctl create "Test Watch" "Apple Watch Series 4 - 44mm" watchOS6.0 $ xcrun simctl create creates a new device.$ xcrun simctl list shows installed devices and their statuses.The talk then goes through an overview of the xcrun simctl command line:  You can then target a single simulator or to all the simulator at once. The most common way is just drag and drop, however you can also use the share sheet: Build/run to new Simulator (the new simulato will show as a build target in old Xcode).Leave Simulator.app open while closing new Xcode.Launch new Xcode and boot its new iOS Simulator.Interesting bits: Simulator window size Run new iOS simulators with old Xcode: ![]() ![]() The talk continues with different tips and tricks on what you can do in the simulator. Thread Sanitizer supported (even on platforms that don’t support them natively).Simulates case-sensitive filesystem (most platforms are case-insensitive, but this adds a nice extra safety net).Different core counts, different threading behaviors. ![]()
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