Create, save, and read text file

I want to open one blank new text file on a button event, 开发者_如何转开发edit the text, and save it in a directory, and also read that file at any time.

You can read a text file into a string with this method on NSString:

+ (id)stringWithContentsOfFile:(NSString *)path
                  usedEncoding:(NSStringEncoding *)enc
                         error:(NSError **)error

You can write it again with:

 - (BOOL)writeToFile:(NSString *)path 
          atomically:(BOOL)useAuxiliaryFile 
            encoding:(NSStringEncoding)enc 
               error:(NSError **)error