Hello World导致Iphone 5s死机

Question

I recently began going through the official Apple documentation and tutorials to learn iPhone development. I got my Iphone 5s a couple of days ago, but the sample ToDo list app that I'm making causes the device to lock up randomly when I try to test on the device. For example, I if I make a chance to the code and build/run it on the device, it will work. However, as I keep updating the code and testing it, eventually it will just open up my app on the device as a complete black screen, and freezes. The home button then no longer works, no touch events work, the only think I can do is to hold Home+lock button until the device shuts down.

This cannot be normal, can it? I mean, its just a basic app, what could be causing it?

Attached is the error that shows in xcode, and also a screenshot of the Iphone when it its frozen. Surprisingly, I was able to use the screenshot functionality on the phone... :/

Answer 1

Please check whether you are using a distribution provisioning profile/certificate to sign the app. If you plan to debug the app on the device (use breakpoints etc.), you should sign it with a development provisioning profile.

Answer 2

It only happens sometimes, so it's not provisioning related.

It causes a message to popup in XCode itself, so it's not code related.

I had the same problems before (not that often really...). What I did was

1. Restart the device
2. Remove the app from the device
3. Clear the project builds (CMD SHIFT K)
4. Restart XCode.
5. Build & Run again

I actually haven't seen this for a while. I always thought that they fixed the bug. Hope this helps!