With iOS, how to check if URL is empty

Hmm, try

if ([URL isEqualToString:@"The URL?"]) {

if (URL ==  [NSNull null]) {
    //...
} else {
    //...
}

Or

if (URL == nil) {
    //...
} else {
    //...
}

Or Check with length of URL

If the URL object is a string, you can use either,

if([string length] == 0) { //empty }

or

if([string isEqualToString:@""]) { // empty }

If the URL object is an NSURL, you can use:

if([[url absoluteString] isEqualToString:@""]) { //empty }