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# NSSetUncaughtExceptionHandler(_:)

Changes the top-level error handler.

```
func NSSetUncaughtExceptionHandler(_: ((NSException) -> Void)?)
```

## Discussion

Sets the top-level error-handling function where you can perform last-minute logging before the program terminates.

## See Also

[`NSGetUncaughtExceptionHandler()`](/documentation/Foundation/NSGetUncaughtExceptionHandler())

Returns the top-level error handler.

  <doc://com.apple.documentation/documentation/AppKit/NSApplication/reportException(_:)>


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