Question

Why am I getting memory leaking while analyzing using XCode?

NSString *email = [defaults objectForKey:@"email"];
NSString *encodeEmail = (__bridge NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (__bridge CFStringRef)email, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));


NSString *urlp1=@"/xyz/xx/";
NSString *fullUrl=[urlp1 stringByAppendingString: [NSString stringWithFormat:@"%@/following", encodeEmail]];

Answer 1

From transitioning to ARC release notes

__bridge transfers a pointer between Objective-C and Core Foundation with no transfer of ownership.

It means encodeEmail doesn’t have the ownership of the allocated memory, and so it won’t be released by ARC.

I think you should use __bridge_transfer

__bridge_transfer or CFBridgingRelease moves a non-Objective-C pointer to Objective-C and also transfers ownership to ARC. ARC is responsible
for relinquishing ownership of the object.

NSString *encodeEmail = (__bridge_transfer NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (__bridge CFStringRef)email, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));