How to handle run time exceptions in Swift

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Created Jul ’20

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I am working on a swift based iOS application. I am working with Swift 4.2 and Xcode 11.3.1. I want to implement the try catch exception handling for all the major functions irrespective of whether the function 'throws', so that I can get all the exceptions which are occurring in the application to any user at run time. I am planning to log all such run time exceptions in the text file on device and then upload it to my backend server for analyzing issues.

I have already tried to do this, but it seems Swift is not providing way to handle all the run time exceptions without throws.

Is there a way, I can achieve the exception logging which I have mentioned above?

I will appreciate any help.

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Answer 1

DTS Engineer OP

Apple

Jul ’20

The term exception is commonly used to refer to three different things:

Swift errors — Swift’s error throwing facility looks like an exception mechanism but it is not. For a good introduction to the philosophy behind this, see ErrorHandlingRationale.
Language exceptions — On modern platforms [1], Objective-C and C++ share a common exception mechanism. For example, if you try to add a nil value to an NSMutableArray, this is what gets thrown.
Machine exceptions — These exceptions are raised by the hardware itself, for example, if you try to access a NULL pointert. You can catch these in various ways (Mach exception handling, BSD signals) but it’s a very tricky business.

These different mechanisms are transparent to each other. For example, if you set up a Swift error handler and the code you call throws an language exception, the Swift error handler won’t be invoked.

So, what sort of exceptions do you want to catch?

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[1] Everything exception 32-bit Intel on macOS.

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