Escape Quotes in Objective-C
Solution 1
I needed to take the user inputted NSString from [textField text]
and make sure that if there are quotation marks in the string, they are escaped properly in order to send through a POST statement.
My solution was:
unescaped = [unescaped stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];
Solution 2
First, you don't want to use __bridge_retained
in your cast to a CFStringRef
. Just use __bridge
.
Second, you don't have to escape the quotes manually by string replacement. Just add the quote character to the set of characters to be quoted when calling CFURLCreateStringByAddingPercentEscapes()
. Like so:
NSString *unescaped = [textField text];
NSString *escapedString = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL,
(__bridge CFStringRef)unescaped,
NULL,
CFSTR("!*'();:@&=+$,/?%#[]\""),
kCFStringEncodingUTF8));
(In addition to adding the quote to the set, I changed to use CFBridgingRelease()
rather than a __bridge_transfer
cast because I find it clearer. It satisfies the feeling that all CF "Create" functions need a corresponding "Release". Also, I changed the use of a @""
literal cast to CFStringRef
to just a CFSTR("")
literal.)
Solution 3
Quotes are to be escaped with \"
.
As in:
(CFStringRef)@"I'm an \"example\""
Comments
-
Moe almost 2 years
I'm using this code snippet to encode characters to be friendly with a POST request:
NSString *unescaped = [textField text]; NSString *escapedString = (__bridge_transfer NSString *)CFURLCreateStringByAddingPercentEscapes( NULL, (__bridge_retained CFStringRef)unescaped, NULL, (CFStringRef)@"!*'();:@&=+$,/?%#[]", kCFStringEncodingUTF8);
Which works great, but does not add escape Quotation marks:
"
How do I escape Quotation marks in IOS?
-
Moe about 12 yearsI know this, I want you to know how to get a user inputted
"
and change it to:\"
-
Manoj over 9 yearswhy not use NSRegularExpression's "escapedPatternForString:" class method?