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NSString *string1;
string1=@"aa bb cc dd";
[string1 stringByReplacingOccurrencesOfString:@" " withString:@"+"];
NSLog(@"------string1 is %@--------", string1);
I expect aabbccdd but its still aa bb cc dd. the space didn’t got taken out.
NSString is not mutable, so
stringByReplacingOccurrencesOfString:withString:is returning a new NSString, that you’ll have to assign to a variable.