How to Get Unicode Value into a String Objective C -

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I'm actually trying to get the unicode value of a letter, and put it in a escape string . I set the title of an NSButton to ±, now I am trying to get the title of this button and convert it to "\ U00B1";

For example 

  Aichaara the Kart = [The Batton Nightlight at Endx: 0]; // Now how will I change the top of the string like "@ \ \ u03b2"

There will be a solution: 

  unichar theChar = ... NSString * escapeCode = [NSString stringWithFormat: @ "\\\\ u% 04x", author];

Note that to get two in the string as a result, you need four backslashes.


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