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I've been debugging up to 4 devices at once recently for an iOS networking project with XCode 4. Having today updated to XCode 5 to be able to build to iOS7 devices, I've found that XCode will crash when ever I try to debug a second device simultaneously. The simulator seems to debug fine while one other device is debugging however.
The crash seems to be at the point where XCode tries to launch the app on the device. XCode immediately closes, and bring up the all too familiar 'Xcode quit unexpectedly' dialogue box. There doesn't appear to be anything all that helpful in the output other than the following.
ASSERTION FAILURE in /SourceCache/DVTFoundation/DVTFoundation-3532/Framework/Classes/FoundationClassCategories/DVTNSKeyValueObserving.m:427
Anyone have any clues if there's something I can do about this or do I just have to wait for an update to fix the problem?
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When trying to run the default iOS test App from Xcode, the simulator gets stuck and just shows a black screen. I'm on MacOS Ventura 13.1 with Xcode version 14.2, the simulated iOS device has iOS version 16.2.
I created a new iOS App project in Xcode, changed nothing (everything as default) and tried to run it. It compiled successfully and starts the simulator (which shows the apple logo for a short time) but then hangs on a black screen.
I think the problem was that I downloaded XCode from the Apple website and not from the App Store, so I uninstalled it and downloaded it from the App Store, now the iOS Simulator works just fine.
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I clearly updated Xcode in my Appstore to version 7.2, and it completed the update, but when I open the about Xcode window, it still shows version 7.1.1 Why hasn't it updated? I cant run it into my iPhone devices which is having iOS 9.2 OS..
If i try to run my xcode project in my iphone device (iOS 9.2) it shows an alert "Could not find developer disk image"
Here i attached the screenshots
Restart Xcode. If that don't fix - check if you have only one Xcode installed.
Go to Xcode Preferences and click on Locations
There you can see command line change that from new to old now try it.
In that Command line tools there in no 7.2 means you need to reinstall it.
Hope this helps you.
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My iOS app is not working in the new version of iOS 9 device.It worked perfectly for my older versions .I am using iPhone 6 and the Xcode doesn't provide the app to be run properly after the new update of Xcode. can anyone suggest any solutions?
You are not able to run because of the new update in Xcode. follow these steps:
open Xcode and click on the target on the left side of your project.
click the info button and custom iOS target properties.Try adding the required support for your app in custom targets.Hope that works for you.
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My watchkit app can't run on simulator.
After I choose the xxx Watch App scheme, and click Run,
It display "Running xxx on iPhone 6", but never go to the second step of
"Running xxx WatchKit Extension", so Watch application never displayed.
I following Apple's standard steps of creating a simple demo application. Apple's demo app can't be started either. Anything I did wrong?
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I want to know that testing in real device and the instrument is same? only for producing crash. that means the crash which produced in device will be produced in instruments also?
Note: ARC enabled projects
99% crashes happenning on devices will also happen on simulators (ie can be instrumented), that is, as long as you have covered all possible combinations of iOS version and device type - iPhone / iPad, and with exception of features not supported by simulators: phone call, location tracking, motions etc.
Testing on devices however is strongly recommended, not because of 1% crashes, but because the experience of user with a device is very different from that with a simulator. Examples: a tiny button can easily be clicked with a mouse / trackpad, but might not be accessible with a finger; element sizes / colors might feel different on a real device...