Question

I need to validate a UITextField to replace a blank space ‘ ‘ with ‘%20’ and was wondering how this is possible?

Answer 1

Check out the method stringByReplacingOccurrencesOfString:withString: on NSString if you are just looking to replace the characters in a string with another value.

Returns a new string in which all occurrences of a target string in the receiver are replaced by another given string.

NSString *originalString = @"Sample text with spaces";

NSString *newString = [originalString stringByReplacingOccurancesOfString:@" " withString:@"%20"];

If you are attempting to encode a URL, use stringByAddingPercentEscapesUsingEncoding: on NSString.

Returns a representation of the receiver using a given encoding to determine the percent escapes necessary to convert the receiver into a legal URL string.

NSString *originalString = @"Sample text with spaces";

NSString *newString = [originalString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];