Explain NSError in Swift.

1.	Explain NSError in Swift.
Answer» Information about an error condition is encapsulated within an NSError object in an extendable and object-oriented manner. An NSError object is comprised of THREE basic attributes: a predefined error domain (represented as a STRING), a domain-specific error code, and a user info dictionary containing application-specific information. EXAMPLE: The examples below show how to CREATE custom errors. NSString domain = @"com.MyCompany.MyApplication.ErrorDomain"; NSString desc = NSLocalizedString(@"Unable to COMPLETE the process", @""); NSDictionary userInfo = @{ NSLocalizedDescriptionKey : desc }; NSError error = [NSError errorWithDomain:domain code:-101 userInfo:userInfo];

Answer»

Information about an error condition is encapsulated within an NSError object in an extendable and object-oriented manner. An NSError object is comprised of THREE basic attributes: a predefined error domain (represented as a STRING), a domain-specific error code, and a user info dictionary containing application-specific information.

EXAMPLE: The examples below show how to CREATE custom errors.

NSString *domain = @"com.MyCompany.MyApplication.ErrorDomain";

NSString *desc = NSLocalizedString(@"Unable to COMPLETE the process", @"");

NSDictionary *userInfo = @{ NSLocalizedDescriptionKey : desc };

NSError *error = [NSError errorWithDomain:domain code:-101 userInfo:userInfo];

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