What is NSCoding protocol?

NSCoding is a protocol that you can implement on your data classes to support the encoding and decoding of your data into a data buffer, which can then persist on disk. Implementing NSCoding is actually ridiculously easy — that’s why you may find it helpful to use.

What is NSCode?

NSCoder declares the interface used by concrete subclasses to transfer objects and other values between memory and some other format. This capability provides the basis for archiving (storing objects and data on disk) and distribution (copying objects and data items between different processes or threads).

What is the need to use NSCoding protocol?

The NSCoding protocol declares the two methods that a class must implement so that instances of that class can be encoded and decoded. This capability provides the basis for archiving (where objects and other structures are stored on disk) and distribution (where objects are copied to different address spaces).

What are the two required methods for the NSCoding protocol?

Once you conform to the NSCoding protocol, you’ll get compiler errors because the protocol requires you to implement two methods: a new initializer and encode() .

What is NSCoding in Swift?

Broadly speaking, NSCoding is the Objective-C way of archiving data and Codable is the Swift way. method that converts raw data back into a UIColor . Creating an encode(to:) method that converts a UIColor into raw data, which Codable can then base-64 encode.

What is Nssecurecoding?

A protocol that enables encoding and decoding in a manner that is robust against object substitution attacks.

What is Nscopying?

A protocol that objects adopt to provide functional copies of themselves.

What is Nsdictionary?

An object representing a static collection of key-value pairs, for use instead of a Dictionary constant in cases that require reference semantics.

What is NSString?

An NSString object encodes a Unicode-compliant text string, represented as a sequence of UTF–16 code units. The objects you create using NSString and NSMutableString are referred to as string objects (or, when no confusion will result, merely as strings). The term C string refers to the standard char * type.

What is the difference between NSString and string?

NSString : Creates objects that resides in heap and always passed by reference. String: Its a value type whenever we pass it , its passed by value. String is automatically bridged to Objective-C as NSString.

What does NS mean in Swift?

NeXTSTEP
The Foundation Kit, or just Foundation for short, is an Objective-C framework in the OpenStep specification. It provides basic classes such as wrapper classes and data structure classes. This framework uses the prefix NS (for NeXTSTEP). It is also part of Cocoa and of the Swift standard library.

What is an NSString?

What is nscoding and how does it work?

How is NSString represented in a Unicode string?

An NSString object encodes a Unicode-compliant text string, represented as a sequence of UTF–16 code units. All lengths, character indexes, and ranges are expressed in terms of 16-bit platform-endian values, with index values starting at 0.

When to use NSString to interpret UTF-16 data?

Interpreting UTF-16-Encoded Data. When creating an NSString object from a UTF-16-encoded string (or a byte stream interpreted as UTF-16), if the byte order is not otherwise specified, NSString assumes that the UTF-16 characters are big-endian, unless there is a BOM (byte-order mark), in which case the BOM dictates the byte order.

What do you need to know about NSString subclasses?

Any subclass of NSString must override the primitive instance methods length and character (at:). These methods must operate on the backing store that you provide for the characters of the string. For this backing store you can use a static array, a dynamically allocated buffer, a standard NSString object, or some other data type or mechanism.