ios - How to put line breaks on strings Objective-C -

If I have a string in Objective-C which is actually long, such as:

  NSString * text = [NSString stringWithFormat: @ "% @", _sometext];   
 How can I scan  _sometext  and add a line break to every hundred letter (letter) string?  
 So if I had  _sometext  like  
 
 it was November. Although it was not too late, when I turned to Londres Street then the sky was dark. Father had finished for the day, stopped the lights of the shop and closed the shutter; But so I will not come home in the dark which he left on the stairs with light on the flat.   
 How can I make it so that it will bring a line break  
 
 It was November. Although it was not too late, when I turned to Londres route   
 and after that  
 
 Father had finished for the day, stopped the lights of the shop and closed the shutter; But so I wo   
 (because they were 100 characters)?  
 But instead of closing in the middle of the word, I can leave this word and end in example in the previous word: if the sentence ends on " this happens"  and The word "wish" was cut, then instead of " but therefore i " it must be stopped   
 
 
 The easiest way I can think from above my head is a two step process.  
 The phase involves breaking the original string into an array of 100 character strings.  
 Phase 2 includes joining that array of stars with the new line.  
  NSMutableArray * line = [NSMutableArray array]; While ([original string length]> 100) {[Lineod object: [originally stringedindexed: 100]]; Original string = [original string substringFromIndex: 100]; } [Lines addObject: original string]; NSString * reformattedString = [lines of components combined breasting: @ "\ n"];