Ios – iPhone Simulator suddenly started running very slow

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I have been working on an app in iphone simulator for a number of weeks and it has been running well up until now, but all of a sudden has begun running very slow both when loading content and animations. I have not made any changes to my code since I last tested it successfully.

I tried restarting the simulator (multiple times) and removing the app and doing a completely clean rebuild, but no luck. I also checked my cpu usage through the monitor while the simulator is running and I am only using about 30% of my cpu and 40% of memory.

I fully understand that the simulator is never a quick as the device itself, but it seems strange that it has suddenly started running slow after such a long time, and by slow I mean less than a quarter of its original speed.

Best Answer

In the iOS simulator, at the bar on the top, click on Debug → Toggle Slow Animations (or Slow Animations with Xcode 10+). Chances are you accidentally toggled it on.

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Ios – iPhone simulator – how to detect when app is running on simulator (so can setup test data)

I obviously do use something like this ...

#import <TargetConditionals.h>

#if TARGET_IPHONE_SIMULATOR

// Simulator specific code

#else // TARGET_IPHONE_SIMULATOR

// Device specific code

#endif // TARGET_IPHONE_SIMULATOR

And to your second question ... Something like this should help you. In your app delegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  if ( ! [[NSUserDefaults standardUserDefaults] boolForKey:@"initialized"] ) {
    // Setup stuff
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"initialized"];
  }

  ... your code ...
}

Iphone – Slow down internet for iOS simulator

You can set the network to slow characteristic by testing on devices. Go to Settings -> Developer Settings -> Network Link Conditioner -> Enable. This is for iPhone/iPad running iOS 6 Network Link Conditioner is also available for the Mac in "Additional Tools for Xcode" for testing in the Simulator.

Note: It appears after device has been connected to Xcode, enabled for development and some app run on it.

Here's how you can test HORRIBLE network performance: enter image description here

Best Answer

Related Solutions

Ios – iPhone simulator – how to detect when app is running on simulator (so can setup test data)

Iphone – Slow down internet for iOS simulator

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