iphone - How do i replace spaces with +'s in Xcode -

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I am creating an app in which a lot of URLs are called from a MySQL server.

What do I have to do for my app to take text file text and send it (which I already knew how to do) but I need to change the space with + (plus)

- (NSString *) StringByrepling accordions offstring: (NSString *) target withString: (NSString *) replacement; 
  str = [str stringByReplacingOccurrencesOfString: @ "" withString: @ "+"];

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