After updating to Xcode 15 and macOS Sonoma, there is not an option to download an iOS 14 simulator. My app's minimum deployment target is iOS 14. How can I test that my app is functioning correctly on iOS 14 devices if I cannot download the appropriate simulator? Any ideas for a workaround? Thank you in advance!
I am having the exact same issue. And after trying to manually install the runtime, based on the errors I got I think the iOS 14.5 simulator runtime is just not compatible with macOS Sonoma. Out in the wild a quite large percentage of our user base is using iOS 14 and we just can't drop the iOS 14 support. I am really hoping that an update will fix this soon as iOS 14.5 is still a pretty recent version of iOS to just drop support out of the blue like that.
The release notes seem to only list the newest version that Xcode 15 support. You can download simulator SDKs back to iOS 15.0, but it doesn't seem to support < 15.0, or at least I can't figure out how to download it. You can download the available ones from the Settings/Platforms tab, + in lower left, choose iOS. Then you get a list of simulator runtimes to install. The oldest is iOS 15.0.
So according to Apple's docs, Xcode 15.1 will only run on macOS 13.5, and iOS 14 simulators will only run before macOS 13.3.99. This two requirements are in conflict. Yet, Apple's Xcode support page (which doesn't list Xcode 15.1 yet at all) lists it's possible at least in the Xcode 15.1beta.
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While I understand what simulation and emulation mean in general, I almost always get confused about them. Assume that I create a piece of software that mimics existing hardware/software, what should I call it? A simulator or an emulator?
Simulator mimics the activity of something that it is simulating. It "appears"(a lot can go with this "appears", depending on the context) to be the same as the thing being simulated. For example the flight simulator "appears" to be a real flight to the user, although it does not transport you from one place to another.
It's a difference in focus. Emulators1 focus on recreating the behavior of a system, with no regard for how the system functions internally. Simulators2 focus on modeling the components of a system. You use an emulator when you care mostly about what a system does, and a simulator when you care about how it does it.
In short: an emulator is designed to copy some features of the orginial and can even replace it in the real environment. A simulator is not desgined to copy the features of the original, but only to appear similar to the original to human beings. Without the features of the orginal, the simulator cannot replace it in the real environment.
A simulator is used in another thinking context, e.g a plane simulator, a car simulator, etc. The simulation will take care only of some aspect of the actual thing, usually those related to how a human being will perceive and control it. The simulator will not perform the functions of the real stuff, and cannot be sustituted to it. The plane simulator will not fly or carry someone, it's not its purpose at all. The simulator is not intended to work, but to appear to the pilot somehow like the actual thing for purposes other than its normal ones, e.g. to allow ground training (including in unusual situations like all-engine failure). So simulator definition would be: something that can appear to human, to some extend, like the original, but cannot replace it for actual use. In addition the pilot will know that the simulator is a simulator.
I don't think we'll see any ROM simulator, because ROM are not interacting with human beings, nor we'll see any plane emulator, because planes cannot have a replacement performing the same functions in the real world.
In my view the model inside an emulator or a simulator can be anything, and has not to be similar to the model of the original. A ROM emulator model will likely be software instead of hardware, MS Flight Simulator cannot be more software than it is.
Note that the plane simulator will have also to simulate the earth, the sun, the wind, etc, which are not part of the plane, so a plane simulator will have to mimic some aspects of the plane, as well as the environment of the plane because it is not used in this actual environment, but in a training room.
To understand the difference between a simulator and an emulator, keep in mind that a simulator tries to mimic the behavior of a real device. For example, in the case of the iOS Simulator, it simulates the real behavior of an actual iPhone/iPad device. However, the Simulator itself uses the various libraries installed on the Mac (such as QuickTime) to perform its rendering so that the effect looks the same as an actual iPhone. In addition, applications tested on the Simulator are compiled into x86 code, which is the byte-code understood by the Simulator. A real iPhone device, conversely, uses ARM-based code.
Simulators are commonplace when referring to software that tries to mimic real life actions, such as driving or flying. Gran Turismo and Microsoft Flight Simulator spring to mind as classic examples of simulators.
So if I want to run my old Super Mario Bros game on my PC I use an SNES emulator, because it is using the same or similar computer code (processes) to run the game, and uses the same or similar materials (silicon chip).However, if I want to fly a Boeing 747 jet on my PC I use a flight simulator because it uses completely different processes from the original (there are no actual wings, lift or aerodynamics involved!).
BUT flight simulator is used for a real thing - it trains pilots, gives them skill up and knowledge and it replaces expensive real planes and saves much of money. And we cannot just say a plane-emulator because we have inner feeling that this is much more than that, so we call it simulator :) Plane simulator could contain emulated radar or transponder that is true.
Contra-statements that simulators are used for analysis and study (and emulators for something real), but that analysis and study not less a real thing than emulated GSM boards (even more in the informational age we live in). Analysis adds a value to the business, cuts costs or points out to profits not less than the replaced (emulated) hardware.
The 24-foot NADS-1 simulator is on a six-legged base that rotates up to 330 and moves across the 64-foot square bay floor to simulate driving motions such as accelerating, lane changing, and skidding. There are 23 brakes on the large crossbeam that spans the room, while 42 hydrostatic bearings ride on a thin film of oil across smooth metal belts.
This is an electronic circuit simulator. When the applet starts up you will seean animated schematic of a simple LRC circuit. The greencolor indicates positive voltage. The gray color indicates ground. A red color indicates negative voltage. The moving yellow dots indicate current.
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"Safety is our priority, and we are investing in new technologies that provide enhanced training for our air traffic controllers," FAA Administrator Mike Whitaker said. "The new simulators will help us achieve that by providing real scenarios to train controllers throughout the National Airspace System."
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The Simcyp population-based absorption, distribution, metabolism and excretion simulator is a platform and database for 'bottom-up' mechanistic modelling and simulation of the processes of oral absorption, tissue distribution, metabolism and excretion of drugs and drug candidates in healthy and disease populations. It combines experimental data generated routinely during preclinical drug discovery and development from in vitro enzyme and cellular systems and relevant physicochemical attributes of compound and dosage form with demographic, physiological and genetic information on different patient populations. The mechanistic approach implemented in the Simcyp Simulator allows simulation of complex absorption, distribution, metabolism and excretion outcomes, particularly those involving multiple drug interactions, parent drug and metabolite profiles and time- and dose-dependent phenomena such as auto-induction and auto-inhibition.This review describes the framework and organisation of the simulator and how it combines the different categories of information.
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