In Swift, a char array is bridged as an UnsafePointer. The length is … This got changed in Swift 1.2 so that you need to explicitly cast between these data types, and this remains the same in Swift today. Note, when creating a string constant in this fashion, you should use UTF-8 characters. This is different than calling a method written in Objective-C and supplying a String instead of an NSString as a parameter. Casting to NSString is required to resolve ambiguity between passing Kotlin string as C string and as NSString (casting to Any works too). For possible values, see NSString Encoding. Therefore, you should copy the C string if it needs to be stored outside of the memory context in which you use this property. The simplest way to create a string object is to use the Objective-C @"..." construct − NSString *greeting = @"Hello"; A simple example for creating and printing a string is shown below. NSString to char array objective-c. You can put the actual Unicode data in the string for localized text, as in NSString *hello = @"こんにちは";.You can also insert \u or \U in the string for non-graphic characters.. Objective-C string constant is created at compile time and exists throughout your program’s execution. const char *cstr = [s UTF8String]; Append formatted string to NSString. However, you do not do it this way in Objective-C. Strings in Objective-C are handled using the classes NSString and NSMutableString, and require a little more effort to work with on […] creates a Swift String, not an NSString. Returns NULL if the receiver cannot be losslessly converted to encoding. For example, this code fragment: ... Constructs and returns an NSString object that is the result of interposing a given separator between the elements of the array. Similarly, if the string begins or ends with the separator, the first or last substring, respectively, is empty. To make it work as an NSString, you should cast it to an NSString using the as operator before using it. The simplest way to create a string object is to use the Objective-C @"" Two additional types of Objective-C string … NSString *newStr = [s stringByAppendingFormat:@"%d %f", intVar, floatVar]; Append NSString string to NSString. The string in Objective-C programming language is represented using NSString and its subclass NSMutableString provides several ways for creating string objects. Named arguments are required to resolve ambiguity between initWithFormat: and initWithFormat:locale:. String concatenation is one of the most commonly-used techniques in modern programming. Alternatively one … Accessing characters works the same way in Swift for an NSString: let str: NSString = "hello" let charStr = str.UTF8String // UnsafePointer For a Swift String object things are a little different: let str = "hello" let charStr = str.cStringUsingEncoding(NSUTF8StringEncoding) When Swift originally launched, NSString (older iOS strings) and native Swift strings were completely interchangeable, as were NSArray and Swift arrays, plus NSDictionary and Swift dictionaries. This C string is a pointer to a structure inside the string object, which may have a lifetime shorter than the string object and will certainly not have a longer lifetime. Discussion. Convert NSString to UTF-8 C string. NSString *string = @"example"; NSUInteger length = string.length; // length equals 7 As in the Splitting Example, keep in mind that NSString uses UTF-16 to represent characters. 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