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08-May-2020 23:04

When an application crashes on the i Phone, it disappears without telling the user what happened.

However, it is possible to add exception and signal handling to your applications so that an error message can be displayed to the user or you can save changes.

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Of course, programs do sometimes get released with bugs that may lead to a crash.

However, an unexpected exception can still leave the application in such a bad state that a crash will subsequently occur.

The correct way to handle an uncaught exception is to fix the cause in your code.

In addition, you may simply want more information back from your testers when you know that there are bugs in your program.

In these cases, there are two ways to catch otherwise uncaught conditions that will lead to a crash: Save your data: The very first task to perform in your uncaught exception handler should be to save data that might need saving or otherwise clean up your application.

Of course, programs do sometimes get released with bugs that may lead to a crash.

However, an unexpected exception can still leave the application in such a bad state that a crash will subsequently occur.

The correct way to handle an uncaught exception is to fix the cause in your code.

In addition, you may simply want more information back from your testers when you know that there are bugs in your program.

In these cases, there are two ways to catch otherwise uncaught conditions that will lead to a crash: Save your data: The very first task to perform in your uncaught exception handler should be to save data that might need saving or otherwise clean up your application.

This will mean that the stack memory used by the thread that caused the exception will be permanently leaked. Since a run loop will be used to display the dialog, we can keep that run loop running indefinitely and it can serve as a possible replacement for the application's main run loop.