Launch iOS simulator from Xcode and getting a black screen, followed by Xcode hanging and unable to stop tasks

Surprisingly, what worked for me was going to iOS Simulator menu, and pressing "Reset Content and Settings". (in iOS 13, its under Hardware)

Before resetting the emulator first go to your projects "project navigator" screen and under the general -> depoyment info screen check that the main interface property is properly setup!

https://i.stack.imgur.com/65P0S.png

If you're using SwiftUI

If you're updating from a previous version of Xcode 11, there are some changes to the SceneDelegate willConnectTo session: options connectionOptions initialization:

The main window is now initialized using UIWindow(windowScene: windowScene), where it use to be UIWindow(frame: UIScreen.main.bounds)

On previous version:

    let window = UIWindow(frame: UIScreen.main.bounds)
    window.rootViewController = UIHostingController(rootView: ContentView())
    self.window = window
    window.makeKeyAndVisible()

In new version:

    if let windowScene = scene as? UIWindowScene {
        let window = UIWindow(windowScene: windowScene)
        window.rootViewController = UIHostingController(rootView: ContentView())
        self.window = window
        window.makeKeyAndVisible()
    }

I am a newbie to the iOS app development. I was practising to develop iOS apps from the very beginning and while running a very basic Hello World app, I also faced same issue that only a black blank screen appears after building and running the app in iOS simulator. Somehow while struggling to find out a solution to the problem I accidentally clicked Window-->Scale-->50% in iOS simulator and it did solve my problem. I could then see the Home page with my app and clicking on app icon I was able to run my app successfully. App versions: Xcode 5.1 iOS Simulator: 7.1 OSX: 10.9.3

Restarting your computer should be all you need to do.

This could result from not setting the correct deployment info. (i.e. if your storyboard isn't set as the main interface)

Solution 1 : You can Quit simulator and try again.

Solution 2 (Recommended) : Go to iOS Simulator -> Reset Content and Settings...

https://i.stack.imgur.com/OM6Mn.png

This will pop-up an alert stating 'Are you sure you want to reset the iOS Simulator content and settings?'

https://i.stack.imgur.com/k77cn.png

Select Reset if you wish to or else Don't Reset button.

Note that once you reset simulator content all app installed on simulator will be deleted and it will reset to initial settings.

Another Solution is that if you are building UI programatically in Objective C project, then you might need to add some code to inflate the view, so you will need to add those 3 lines to make the window's interface interacts with the code (the outer 2 are actually interacting with the code and the other one will change the screen to white so you will know it works).

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.

...

self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];


return YES;
}

If you should loose your entry point in your Storyboard or simply wish to change the entry point you can specify this in Interface Builder. To set a new entry point you must first decide which ViewController will act as the new entry point and in the Attribute Inspector select the Initial Scene checkbox.

You can try: http://www.scott-sherwood.com/ios-5-specifying-the-entry-point-of-your-storyboard/

I struggled with this for a couple of hours. Finally what solved it for me was:

sudo xcrun simctl erase all

xcrun simctl shutdown all

https://i.stack.imgur.com/jesi4.png

I fixed this issue by cleaning the project by pressing cmd + shift + k and exited my simulator and built again.

I solved this question with set window background color like this in iOS 13:

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    guard let _ = (scene as? UIWindowScene) else { return }
    if let windowScene = scene as? UIWindowScene {
        window = UIWindow(windowScene: windowScene)
        window?.backgroundColor = .white
        let storyBoard = UIStoryboard(name: "Main", bundle: nil)
        
        // workaround for svprogresshud
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        appDelegate.window = window
    }
}

I've managed to find the fix for this. It was found courtesy of this blog post:

http://vandadnp.wordpress.com/2012/03/18/xcode-4-3-1-cannot-attach-to-ios-simulator/

The solution is to press cmd+shift+, (command, shift and then comma ",").. that loads some options for release or debugging.

Change the debugger from LLDB to GDB. This fixes the issue.

To make sure it's a simulator issue, see if you can connect to the simulator with a brand new project without changing any code. Try the tab bar template.

If you think it's a simulator issue, press the iOS Simulator menu. Select "Reset Content and Settings...". Press "Reset."

I can't see your XIB and what @properties you have connected in Interface Builder, but it could also be that you're not loading your window, or that your window is not loading your view controller.

I had the same issue with Xcode... black screen on launching apps, no debugging and clicking would lock up Xcode.

I finally found the problem... following the lead that the simulator could not connect to Xcode I took a look at my etc/hosts file and found that months ago to solve a different issue I had edited the host file to map localhost to my fixed IP instead of the default... my value:

10.0.1.17 localhost

This should work since that is my IP, but changing it back to the default IP fixed Xcode...

127.0.0.1 localhost

Hope this helps.

I was doing what doug suggests ("Reset Content and Settings") which works but takes a lot of time and it is really annoying... until I recently found completely accidental another solution that is much quicker and seems to also work so far! Just hit cmd+L on your simulator or go to the simulator menu "Hardware -> Lock", which locks the screen, when you unlock the screen the app works like nothing ever happened :)

What happened with me was the Type of class was not UIViewController for the script attached to my view controller. It was for a UITabController..... I had mistakenly quickly created the wrong type of class.... So make sure the class if the correct type.. Hope this helps someone. I was in a rush and made this mistake.

Just reset your simulator by clicking Simulator-> Reset Contents and Settings..

you could also go to Hardware -> reboot, then Hardware -> Home, and click on your App

Be sure that Initial View Controller is set

I solved this only after removing simulators with prior iOS versions.

I had black simulator screens only for iOS 11 sims. After trying to reset, reboot, reinstall and creating a brand new useraccount on my machine I found this solution:

defaults write com.apple.CoreSimulator.IndigoFramebufferServices FramebufferRendererHint 3

found in this answer here: Xcode 9 iOS Simulator becoming black screen after installing Xcode 10 beta

Please check for all the constraints for all the views and review complete storyboard. Usually this happens because of that.

Regards, Arora

In case you recently updated to Xcode 11 beta 3 and try to run an older SwiftUI project, you have to make some changes in the SceneDelegate where the views are loaded, otherwise the screens will remain black on devices running iOS 13 beta 3 which of course includes all simulators.

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).

    // Use a UIHostingController as window root view controller
    if let windowScene = scene as? UIWindowScene {
        let window = UIWindow(windowScene: windowScene)
        window.rootViewController = UIHostingController(rootView: ContentView())
        self.window = window
        window.makeKeyAndVisible()
    }
}

The behavior not strictly limited to the simulators, but since most people will run beta software exclusively on simulators it will only occur in this context. It baffled me for quite a while, so hope it helps.

When i have carried my project on Xcode 11.1, i got that problem. That black screen problem may occur any presentation inter ViewControllers.

That answer helped me. Because modal presentation changed with iOS 13. If you don't get that problem before iOS 13, please try to add line below to your ViewController before its presentation;

viewController.modalPresentationStyle = .fullScreen

after your code may seem like below;

let vc = UIViewController()
vc.modalPresentationStyle = .fullScreen //or .overFullScreen for transparency
self.present(vc, animated: true, completion: nil)

I was developing flutter using android studio and running the simulator, the simulator was dark and I reset the contents as per accepted answer. But that didn't fix my issue. My CPU was running somehow high enough, so I restarted , but not fixed the issue. I opened Xcode and run one of my native iOS apps, the simulator re-opened as usual. I closed the Xcode and opened Android Studio, then started developing flutter app again.

https://i.stack.imgur.com/7lufj.png

This was my reason for having this issue.

For some reason, the "Is Initial View Controller" (for my main View Controller) was unchecked which was causing the black screen on load up.

Hope this helps someone out there!

I noticed I had accidentally deleted var window:UIWindow? line from AppDelegate. Introducing it again fixed the issue for me!

For me all it was needed was to shake the device (Device > Shake). Weird but worked for me. If this doesn't work try resetting (Device > Erase All Content and Settings) and then shake the device again.