Length, indices, and ranges are all based on UTF code units. These two are identical:. As a result, wider encodings usually 16 bits were developed. As noted in Object Descriptionif the object responds to -descriptionWithLocale:that gets called. Both isEqual: and isEqualToString: compare strings byte for byte. This is what NSObject will return to us. Note that although strings are conceptually based on UTF, that does not imply that the class always works with UTFencoded data internally. On the other hand, the Unicode Consortium recommends form C for storage due to better compatibility with strings converted from legacy encodings.
You can also split a string by a substring, using NString's componentsSeparatedByString method. Example from documentation: NSString *list.
objective c How to split string into substrings on iOS Stack Overflow
iOS +; macOS +; UIKit for Mac +Beta; tvOS +; watchOS + Similarly, if the string begins or ends with the separator, the first or last substring. Split a string into an array of strings by using NSString's componentsSeparatedByString: NSString *myString = @"This is a test"; NSArray *myWords = [myString.
The latter are only a subset of the former.
Before, looping over the characters in a string was a lot less fun. This can make your code easier to read and will most likely also improve performance:.
Working with Strings ·
Using rangeOfComposedCharacterSequenceAtIndex:you could write a routine that correctly loops over all characters in a string, but it would be quite inconvenient to have to do this every time you want to iterate over a string. We must absolutely not use UTF8String in these cases.
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|It is good practice to override -description for model objects in such a way that the return value can be used to display the object in UI.
If we need to compare strings too many times that it becomes a bottleneck e. As a result, wider encodings usually 16 bits were developed. The space efficiency for western languages and lack of byte order issues make UTF-8 the best encoding for the storage and exchange of Unicode text.
Sorting, Comparing, and Searching Strings Sorting and comparing strings is more complex than first meets the eye. By default, -debugDescription calls -description. Today, Unicode encodes more than 70, unified CJK characters, easily blasting the bit boundary with these alone.
into a NSArray by calling componentsSeparatedByString method on the NSString as shown in below.
componentsSeparatedByString NSString Apple Developer Documentation
iPhone App Rejected - uses one or more non-public APIs. Say you had an NSString, and you're interested in each single character. You'd think there's split NSString into its characters. for (int i=0; i<. NSString *yourString = @"iOS-Blog"; NSString *yourNewString = [NSString if you need to split on a set of several different characters, use NSString's.
Duplicate Characters Many seemingly identical characters are encoded multiple times at different code points, representing different meanings.
NSString and Unicode ·
Accordingly, the length method returns the number of code units not characters in the string. Just be sure not to insert a semicolon or comma at the end of any lines.
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This was a big problem for the text-based computer systems of the time because only one encoding also called a code page could be active at a time; if you wrote a text on one machine and then opened it on another computer that used a different code page, all characters in the range would be interpreted incorrectly.
To read files with unknown encoding, Apple provides this guideline : If you are forced to guess the encoding and note that in the absence of explicit information, it is a guess : Try stringWithContentsOfFile:usedEncoding:error: or initWithContentsOfFile:usedEncoding:error: or the URL-based equivalents. The Apple documentation actually expresses this correctly in a later section of the String Programming Guide, though Apple continues to assign the wrong meaning to the word character.
iPhone development iPhone NSString operations in Objective C
Accessing a unichar directly by its index with the characterAtIndex: method presents the same problems.
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|Because they erase many formatting distinctions, they will prevent round-trip conversion to and from many legacy character sets, and unless supplanted by formatting markup, they may remove distinctions that are important to the semantics of the text.
For compatibility with preexisting standards, certain characters can be represented either as a single code point or as sequences of two or more code points. The code space is divided into 17 planes with 65, characters each. This wonderful method emphasizes that Apple wants us to think of a string as a collection of substrings, rather than characters in the Apple sensebecause a a single unichar is too small a unit to represent a true Unicode character, and b some characters in the common sense are composed of multiple Unicode code points.
There are eight conversion specifiers for floating-point values: eEfFgGaA.
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