How should I use NSSetUncaughtExceptionHandler in Swift

by

As of Swift 2 (Xcode 7), you can pass Swift functions/closures
to parameters taking a C function pointer. From the Xcode 7 release notes:

Native support for C function pointers: C functions that take function
pointer arguments can be called using closures or global functions,
with the restriction that the closure must not capture any of its
local context.

So this compiles and works:

func exceptionHandler(exception : NSException) {
    print(exception)
    print(exception.callStackSymbols)
}

NSSetUncaughtExceptionHandler(exceptionHandler)

Or with an “inline” closure:

NSSetUncaughtExceptionHandler { exception in
    print(exception)
    print(exception.callStackSymbols)
}

This does exactly the same as the corresponding Objective-C code:
it catches otherwise uncaught NSExceptions.
So this will be caught:

let array = NSArray()
let elem = array.objectAtIndex(99)

NOTE:- It does not catch any Swift 2 errors (from throw) or Swift runtime errors, so this is not caught:

let arr = [1, 2, 3]
let elem = arr[4]

More Related Contents:

  1. How get the list of errors thrown by a function?
  2. Reset Score Button iOS
  3. How do I make an HTTP request in Swift?
  4. How to convert a UIView to an image
  5. Create thread safe array in Swift
  6. Add an element to an array in Swift
  7. UIButton action in table view cell
  8. Xcode, where to assign the segue identifier
  9. Closure cannot implicitly capture a mutating self parameter
  10. Swift Get string between 2 strings in a string
  11. Unexpectedly found nil IBOutlet in prepareForSegue
  12. How to hide keyboard in swift on pressing return key?
  13. How to create a delay in Swift?
  14. How to detect when AVPlayer video ends playing?
  15. Swift – How creating custom viewForHeaderInSection, Using a XIB file?
  16. How to access CoreData model in today extension (iOS)
  17. SwiftUI @Binding Initialize
  18. SwiftUI: Status bar color
  19. Use a generic class as a custom view in Interface Builder
  20. Get an array of property values from an object array
  21. Swift 3 – How to make timer work in background
  22. How to logout user using Facebook authentication using Swift and iOS?
  23. xcode 7.1 swift framework app builds but not archiving
  24. Repeating local notification daily at a set time with swift
  25. The app delegate must implement the window property if it wants to use a main storyboard file swift
  26. Loading ViewController from xib file
  27. Set UITableView’s height to the height of its content with Auto Layout
  28. Accessing variables from another ViewController in Swift
  29. Ambiguous use of subscript xcode 7.1
  30. SwiftUI: Error in dragging logic or is this a bug?

Leave a Comment