Catch Objective-C exception in Swift

Question

I am trying to set the value of an @objc object in my Swift code using obj.setValue(value, forKey: key).

It works fine when the object has the

Answer 1

Swift 5 version with utility error type:

NS_INLINE NSException * _Nullable ExecuteWithObjCExceptionHandling(void(NS_NOESCAPE^_Nonnull tryBlock)(void)) {
    @try {
        tryBlock();
    }
    @catch (NSException *exception) {
        return exception;
    }
    return nil;
}

public struct NSExceptionError: Swift.Error {

   public let exception: NSException

   public init(exception: NSException) {
      self.exception = exception
   }
}

public struct ObjC {

   public static func perform(workItem: () -> Void) throws {
      let exception = ExecuteWithObjCExceptionHandling {
         workItem()
      }
      if let exception = exception {
         throw NSExceptionError(exception: exception)
      }
   }
}