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Problem with NSMakeCollectable when converting to ARC

I am trying to convert my code to ARC and I have a problem with NSMakeCollectable in the ASIRequest library.

- (NSString*)encodeURL:(NSString *)string
{
    NSString *newString = NSMakeCollectable([(NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding])) autorelease]);
    if (newString) {
        return newString;
    }
    return @"";
}

It gives me this error: NSMakeCollectable is unavailable: not available in automatic reference counting.

How can i solve this? Need to be guided. Thank.

EDIT: Tried this and didn't work:

 - (NSString*)encodeURL:(NSString *)string
    {
        NSString *newString = NSMakeCollectable([(NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding])) autorelease]);
        if (newString) {
            return (__bridge_transfer NSString*)newString;
        }
        return @"";
    }

Tried this too:

- (NSString*)encodeURL:(NSString *)string
        {
            NSString *newString = NSMakeCollectable([(__bridge_transfer NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding])) autorelease]);
            if (newString) {
                return newString;
            }
            return @"";
        }
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1 answer

NSMakeCollectableno longer required in ARC. Here you can use CFBridgingRelease.

- (NSString*)encodeURL:(NSString *)string
{
    NSString *newString = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding])));
    // or  NSString *newString = (__bridge_transfer NSString*)(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding]));
    if (newString) {
        return newString;
    }
    return @"";
}
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