A SIGABRT
or an EXC_BAD_INSTRUCTION usually means the app crashed itself intentionally because some check failed. These should log a message to the debugger console with more information; check there for more information.
Many SIGABRT
s are caused by uncaught Objective-C exceptions. There are a lot of reasons exceptions can be thrown, and they will always log a lot of helpful information to the console.
NSInvalidArgumentException
, which means the app passed an invalid argument to a methodNSRangeException
, which means the app tried to access an out-of-bounds index of an object such as an NSArray
or an NSString
NSInternalInconsistencyException
means an object discovered it was in an unexpected state.NSUnknownKeyException
usually means you have a bad connection in an XIB. Try some of the answers to this question.