What is nsstring

Again, it's important to use the right range conversion initializer, because otherwise we'd have the same problem as before, but this time in the other direction: from NSRange to Range. If we select "Hello" again, the info looks straightforward, in that both the Swift string and the NSString are five characters long, and so too are the other views of the Swift string:.

The Swift string is one character long, as expected. You can look up online what the elements of a Unicode character are. In this case, the firefighter emoji character is composed of "woman," a skin tone modifier, a zero-width joiner, and "fire engine" — four scalars in total. Looking at all these different counts, it makes sense that mixing up ranges and indices doesn't work.

You can get away with using Range and NSRange interchangeably if you're only dealing with simple letter characters. Cezar Cezar I notice in the Swift 3 manual that the Foundation types are passed by reference, while the native types are passed by value or something like that I don't fully understand at this point. It would be great if you could update your answer discussing the implications of that.

NSString : Creates objects that resides in heap and always passed by reference. It creates copy when you first mutate it. Swift String is very powerful it has plethora of inbuilt functions. For more information please refer apple documents. Sandy Rawat Sandy Rawat 7 7 silver badges 12 12 bronze badges. This answer should get more up-votes.

This is the fundamental difference between String and NSString. Everywhere else they are almost interchangeable — Max. Great answer. Emanuel Emanuel 1, 1 1 gold badge 19 19 silver badges 27 27 bronze badges. Gabriele Petronella Gabriele Petronella k 20 20 gold badges silver badges bronze badges. Swift's Int data type is stated, in the book, to be the same as the architecture's word size.

NSInteger is also the same size as the word size of the architecture. Swift 4 update String gets revisions in swift 4. Fangming Fangming 22k 4 4 gold badges 91 91 silver badges 85 85 bronze badges. NSString s probably won't be updated to deal with grapheme clusters: It would break too many apps that rely on the old behavior. Also, NSString.

Jiaaro Jiaaro 69k 39 39 gold badges silver badges bronze badges. Yes thats exactly the answer. And the avoidance of dynamically dispatched methods and object variable access is all that makes this speed improvements they talked about at WWDC.

This means that all other initialisers call the documented designated initialiser which calls -init only for MacOS-X compatibility , and anyone writing a subclass only needs to override that one initialiser in order to have all the other ones work.

For MacOS-X compatibility, you may also need to override various other initialisers. Exactly which ones, you will need to determine by trial on a MacOS-X system So to be safe, on MacOS-X you probably need to re-implement all the class cluster initialisers you might use in conjunction with your subclass.

If the data can not be interpreted using the encoding , the receiver is released and nil is returned. Subclasses must override this method. Initialises the receiver with the supplied length of bytes , using the specified encoding. If the data is not in a format which can be used internally unmodified, it is copied, otherwise it is used as is. If the data is not copied the flag determines whether the string will free it when it is no longer needed ie whether the new NSString instance 'owns' the memory.

In the case of non-owned memory, it is the caller's responsibility to ensure that the data continues to exist and is not modified until the receiver is deallocated. Note, this is the most basic initialiser for strings. In the GNUstep implementation, your subclasses may override this initialiser in order to have all other functionality.

Initialize with given C string byteString , which should be null-terminated. Characters are converted to unicode based on the default C encoding. Copies the string. Initialize with given C string byteString up to first nul byte. Characters converted to unicode based on the specified C encoding. Initialize with given C string byteString up to length , regardless of presence of null bytes. Characters converted to unicode based on the default C encoding. Does not copy the string.

If flag , frees its storage when this instance is deallocated. Initialize with given unicode chars up to length , regardless of presence of null bytes.

Copies the string and frees copy when deallocated. Initialises the receiver with the contents of the file at path. Invokes [NSData -initWithContentsOfFile:] to read the file, then examines the data to infer its encoding type, and converts the data to a string using -initWithData:encoding:. The encoding to use is determined as follows Otherwise, the default C String encoding is used.

Releases the receiver and returns nil if the file could not be read and converted to a string. Releases the receiver and returns nil if the URL contents could not be read and converted to a string. Returns the string's content as an int. Current implementation uses a C runtime library function, which does not detect conversion errors -- use with care! Returns NO otherwise. An absolute path in unix mode is one which begins with a slash or tilde.

In windows mode a drive specification eg C: followed by a slash or backslash, is an absolute path, as is any path beginning with a tilde.

In the default gnustep path handling mode, the rules are the same as for windows, except that a path whose root is a slash denotes an absolute path when running on unix and a relative path when running under windows. See also -compare: and related methods. The path component is the last non-empty substring delimited by the ends of the string, or by path separator characters. If the receiver only contains a root part, this method returns it. If there are no non-empty substrings, this returns an empty string.

In a windows UNC path, the host and share specification is treated as a single path component, even though it contains separators. Other special cases are apply when the string is the root. Returns 0 if the conversion is not possible. Calls -getLineStart:end:contentsEnd:forRange: to do the work.

This may be larger than the actual number of bytes needed. If the receiver begins with a root sequence such as the path separator character or a drive specification in windows then that is used as the first element in the array.

Empty components are removed. If a trailing path separator which was not part of the root was present, it is added as the last element in the array. The path extension is a suffix on the last path component which starts with the extension separator a '. Returns an empty string if no such extension exists. Attempts to interpret the receiver as a property list and returns the result. If the receiver does not contain a string representation of a property list then the method returns nil.

Containers arrays and dictionaries are decoded as mutable objects. There are three readable property list storage formats - The binary format used by NSSerializer does not concern us here, but there are two 'human readable' formats, the traditional OpenStep format which is extended in GNUstep and the XML format.

By default GNUstep writes old style data and always supports reading of either style. The traditional format is more compact and more easily readable by people, but without the GNUstep extensions cannot represent date and number objects except as strings. The XML format is more verbose and less readable, but can be fed into modern XML tools and thus used to pass data to non-OpenStep applications more readily.

The traditional format is strictly ascii encoded, with any unicode characters represented by escape sequences. Both the traditional format and the XML format permit comments to be placed in property list documents. See the documentation for NSPropertyListSerialization for more information on what a property list is. If the string cannot be parsed as a normal property list format, this method also tries to parse it as 'strings file' format see the -propertyListFromStringsFileFormat method.

Reads a property list see -propertyList from a simplified file format. As a convenience, it is possible to omit the equals sign and the value, so an entry consists of a key string followed by a semicolon. In this case, the value for that key is assumed to be an empty string. Positions start at 0. If the character is a composed character sequence, the range returned will contain the whole sequence, else just the character itself.

Search only carried out within aRange. If character at anIndex is part of a composed character sequence anIndex note indices start from 0 , returns the full range of this sequence. If aString does not exist in the receiver an empty string is never considered to exist in the receiver , the length of the returned range is zero. If aString is nil , an exception is raised. If any part of aRange lies outside the range of the receiver, an exception is raised.

Options should be OR'd together using ' '. The original string is converted to bytes using the specified encoding and then those bytes are escaped unless they correspond to 'legal' ASCII characters.

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