I just recently finished my project and I was chaining a few things and them suddenly nothing is changing when I run it on simulator or device. It stays the same. When I change the text on label it stays same. Nothing is changing at all! Why is this happening?
Have you tried restarting your computer or cleaning the build. There are times xcode gets buggy and just stops functioning properly.
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As the heading states, I do not get the contents on my live preview appearing on the simulator. The issue does not seem to stem from a syntax error, as the simulator runs perfectly fine. Current solutions I have found have been completed using the storyboard, not the swiftUI.
I have only been able to "resolve" the error through a painstaking restart on my computer every time I update the code. Any solutions appreciated.
Update 1: The white screen persists across projects as well. It may be a software problem, so I am considering reinstalling XCode.
Update 2: "Hello World" works after a bit of waiting. It seems to simply be a really slow launch time..
I realised that all I had to do was run the simulator and then stop the simulator. Then, the updated form would appear within the app.
When I start simulator at random times when I compile/run project my simulator goes like in the attached image...if i press the menu button it doesn't change it remains the same. The error make it impossible to use the simulator.
I tried restarting, resetting simulator work but then it happens again.
What i do to solve the problem:
1. stop project
2. Hardware -> restart simulator
it happened to me 2 times in a row and this method worked and i didnt had to restart laptop.... but you have to do it fast ....
Try to run the default app.
If it doesn't work: there are only two solutions:
run it on an actual device
download the iOS 10.3 simulator (Xcode->Preferences->components->Ios 10.3 simulator)
remember to set this answer to correct if it helped. ;)
When I run the iPhone simulator, sometimes it doesn't move past the opening screen, and sometimes it does.
What I am calling the opening screen is the screen which has the app tittle on it.
I have tried closing and re-opening it. But it doesn't seem to solve the problem, as it still comes back.
I am using the new Xcode beta but this problem also happens to me often in Xcode 6.
The simulator in my opinion is a little buggy to me. This seems to happen to me a lot the first time I run the simulator. After that it seems a little more stable.
This happens to me too sometimes. Simply stop and directly press the "Run" button again.
You can also try to change the Device or uninstall your app on the selected device.
Also try to close the Simulator and open it again and try to run your app after that
My answer is you cannot make sure about that, since it is just a simulator.
This happen to me to when i use xcode6 sometimes, but when i use xcode 5.1.1 it is working perfectly.
I think xcode6 do not stop the current running app before running the other instead it just override the current "same" running app. here is my theory as i observe it.
Assuming simulator is running.
in XCode 5.1.1:
Stops the currently running app > Compile > Run
but in XCode 6:
Compile > Override the same running app
But you dont want to worry about that so much, as long as it doesn't appear in actual device it is all good.
Everything was working perfectly when debugging my keyboard on Xcode 6.2 running iOS 8.2. After updating to Xcode 6.3 and iOS 8.3, I seem to be having difficulty getting the debugger to work. Has anyone experience similar problems? I've tried cleaning my build, uninstalling/installing my app, but nothing seems to work.
What happens is I build and run, and when I switch between keyboards to get to mine it just never pops up, instead it jumps to the default one. Upon ending the task, and doing it again it works perfectly, just not when I'm attempting to debug.
Some of the information from this answer is a bit outdated, but it was useful to me. I am still convinced that extension debugging on devices is 90% broken with XCode 6.3.2 and iOS 8.3. I've been debugging successfully from the simulator, though, and occasionally I'll get the device process to attach correctly from within XCode, but more often than not it just quits on me.
I have been having this weird problem with Xcode 4.3.2, of course after the recent update.
After successfully building and running on the simulator several times, xcode seems to not be able to connect to the simulator and can't even stop the project; it's like the simulator does not exist. I have tried:
Stopping the project – doesn't work.
Quitting the simulator – doesn't work, xcode still shows it's running on the simulator even when I quit the simulator.
Cleaning the project – doesn't work.
I have to force quit xcode to get it communicate with the simulator. Nothing else works. It gets quite frustrating to do it every half an hour. This only started with 4.3.2.
I always stop before building and running, so it is not an issue of simulator/xcode getting thrashed by me.
Any suggestions?
I have found by chance, it is not a solution by any means -
When xcode hangs, saying it is running the app, but nothing is on simulator, opening the simulator from the dock by clicking on the dock icon (not using command+tab) seems to work.
It is very weird,but it works; atelast till xcode fixes it.
I had the same damn issue on XCode 4.5.1, but I resolved it just now.
When the program is running, it gets compiled but doesn't show anything on the simulator. just click on iOS Simulator icon in dock in order to bring it to front. Click iOS Simulator on top left -> Reset content and settings -> then force quit the iOS Simulator and run the program again. !!
Besides a restart, there is one other way I've managed to get around this:
Let's say your app hangs, go to the targets selector in the top of the Xcode window and change your sim target to a new SDK (or if you don't have another SDK, change it to a universal app and run on the opposite device simulator).
Then, when your app loads on the new device/OS completely, quit the sim, change your targets back, et voilà!
Uninstall application from Simulator and again run. Then it will works fine :)
This has frustrated me for -years- now but stumbled across what appears to get things going again for me:
Hide the simulator (iOS Simulator -> Hide iOS Simulator) or Cmd-H, then reopen the simulator.
The problem seems to happen when something CPU intensive is happening in the background (like a Time Machine backup) on my old 2 core MacBook.
Xcode 4.6.3 update (June 13, 2013) resolves the following issue:
Hang when debugging in iOS Simulator on OS X 10.8.4. 13722320
https://developer.apple.com/library/mac/#releasenotes/DeveloperTools/RN-Xcode/
You can try to update your Xcode to see if that works for you..