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I feel incredibly stupid for asking this, but the documentation and Google are giving me no love at all.
I have a Unicode character I want to insert into a string literal in the source code of my iPhone app. I know its hex value. What is the proper escape sequence to use? And for that matter, what obvious source of information am I overlooking that would have told me this?
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A unicode escape sequence is a backslash followed by the letter 'u' followed by four hexadecimal digits (0-9a-fA-F). It matches a character in the target sequence with the value specified by the four digits. For example, ”\u0041“ matches the target sequence ”A“ when the ASCII character encoding is used.
It can represent all 1,114,112 Unicode characters. Most C code that deals with strings on a byte-by-byte basis still works, since UTF-8 is fully compatible with 7-bit ASCII. Characters usually require fewer than four bytes. String sort order is preserved.
To insert a Unicode character, type the character code, press ALT, and then press X. For example, to type a dollar symbol ($), type 0024, press ALT, and then press X. For more Unicode character codes, see Unicode character code charts by script.
Unicode uses two encoding forms: 8-bit and 16-bit, based on the data type of the data that is being that is being encoded. The default encoding form is 16-bit, where each character is 16 bits (2 bytes) wide. Sixteen-bit encoding form is usually shown as U+hhhh, where hhhh is the hexadecimal code point of the character.
Example:
NSString *stuff = @"The Greek letter Beta looks like this: \u03b2, and the emoji for books looks like this: \U0001F4DA"; If you don't want to put it directly in your string you can use a format specifier like this:
[string stringByAppendingFormat:@"%C", 0x2665]; If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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