What is NSError in Swift?

NSError is a Cocoa class. An NSError object encapsulates information about an error condition in an extendable, object-oriented manner. It consists of a predefined error domain, a domain-specific error code, and a user info dictionary containing application-specific information.

What is NSError code?

code & domain Like exit status codes, an NSError -code signals the nature of the problem. These status codes are defined within a particular error domain , in order to avoid overlap and confusion. These status codes are generally defined by constants in an enum .

What is NSError object made of?

The core attributes of an NSError object are an error domain (represented by a string), a domain-specific error code and a user info dictionary containing application specific information.

How do you beat NSError?

However, you need to be sure the myParser object handles the error parameter properly. In case you want to handle it here, you need to make sure the pointer to pointer error points to something, otherwise you will have crash when dereferencing it. Not a problem when parserError is nil, but when error is nil.

Do catch IOS Swift?

The try/catch syntax was added in Swift 2.0 to make exception handling clearer and safer. It’s made up of three parts: do starts a block of code that might fail, catch is where execution gets transferred if any errors occur, and any function calls that might fail need to be called using try .

What is Nsexception?

An object that represents a special condition that interrupts the normal flow of program execution.

What is NSDictionary?

The NSDictionary class declares the programmatic interface to objects that manage immutable associations of keys and values. Each entry consists of one object that represents the key and a second object that is that key’s value. Within a dictionary, the keys are unique.

What does Nscocoaerrordomain mean?

This error means that the directory cannot be created because of a permission error. That’s where I’m lost as the only reason I can see would be if I’m creating a file outside of my app’s sandbox.

What is NSException?

How do I create a swift error?

1. Create A Custom Error And Conform To The Error Type. To create a custom error, create an enum in Swift that conforms to the Error protocol.
2. Extend A Custom Error.
3. description for Custom Errors Using CustomStringConvertible.
4. localizedDescription For Custom Errors Using LocalizedError.
5. Throw Custom Errors.
6. Catch Custom Errors.

Do catch vs Try Swift?

try – You must use this keyword in front of the method that throws. Think of it like this: “You’re trying to execute the method. catch – If the throwing method fails and raises an error, the execution will fall into this catch block.

What to do with nserror in Apple Developer?

Returns an NSError object initialized for a given domain and code with a given userInfo dictionary. The error code. A string containing the error domain. The user info dictionary. class func setUserInfoValueProvider(forDomain: String, provider: ( (Error, String) -> Any?)?)

Where do I find the nserror code on my Mac?

The enumeration constants beginning with NSFile indicate file-system errors or errors related to file I/O operations. Use the key NSFilePathErrorKey or the NSURLErrorKey (whichever is appropriate) to access the file-system path or URL in the userInfo dictionary of the NSError object. The start of the range of error codes reserved for bundle errors.

What can a nserror object DO FOR YOU?

An NSError object may also provide localized error descriptions suitable for display to the user in its user info dictionary. See Error Handling Programming Guide for more information.

Why did I get a nserror code on my iPhone?

A conflict occurred during an attempt to save changes. Sharing failed due to a network failure. The current user doesn’t have permission to perform the requested actions. An otherwise unspecified cloud-sharing error occurred. The user doesn’t have enough storage space available to share the requested items.