Randomly (that's why I ask the question), my application crashes when want to display data into textView.
The only error message I've got in my debug console is :
libc++abi.dylib: terminate_handler unexpectedly threw an exception
I Googled but can't get a clue to find how correct this and how this happens.
Clean the project. Check each constraints and remove the corrupted one. Clean project again, it should works.
I got the same error and a "clean" didn't resolve it.
It was caused by my internet testing flow, I check to see if WiFi is connected but not if that WiFi has an active internet connection that can resolve a supplied URL. It performs a dataWithContentsOfURL: that will ultimately fail. A similar thread made this suggestion to this question here by user Keith that helped me identify the problem -- which was to add breakpoints to C++ exceptions.
To enable -- click your breakpoints view and the very bottom click the '+' to add a breakpoint. Set it up as follows and the stack trance will be more meaningful.
This can be caused by an outlet that is no longer existing (might have been renamed or removed).
Here is a tip on how to check outlets: Select the container view of the suspected outlet, pay attention to "!" marks in the connections inspector.
I got this question ,because I set [self addObserver:self forKeyPath:@"_defaultAgType" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil];, but I did not remove it in dealloc. I solved this by [self removeObserver:self forKeyPath:@"_defaultAgType"]; in dealloc function.
Another reason why it could happen is when you have a UI element declared but never added to the screen but still you try to do changes on them.
In my case I had a UIBarButtonItem declared in the code but I never added it to View. When I try to remove it without adding it, I had this issue.
If you renamed/moved your view controller class, make sure you've checked Inherit Module From Target on Identity inspector for your scene on the storyboard
来源：https://stackoverflow.com/questions/25932033/libcabi-dylib-terminate-handler-unexpectedly-threw-an-exception-0-stack-tra