Objective-C: How to add query parameter to NSURL?

Question

Let\'s say I have an NSURL? Whether or not it already has an empty query string, how do I add one or more parameters to the query of the NSUR

Answer 1

The iOS8+ modern way

adding (or replacing 'ref' value if exists) ref=impm to url which is on min60.com

if ([[url host] hasSuffix:@"min60.com"]) {

    NSURLComponents *components = [[NSURLComponents alloc] initWithURL:url resolvingAgainstBaseURL:NO];
    NSURLQueryItem * newQueryItem = [[NSURLQueryItem alloc] initWithName:@"ref" value:@"impm"];
    NSMutableArray * newQueryItems = [NSMutableArray arrayWithCapacity:[components.queryItems count] + 1];
    for (NSURLQueryItem * qi in components.queryItems) {
        if (![qi.name isEqual:newQueryItem.name]) {
            [newQueryItems addObject:qi];
        }
    }
    [newQueryItems addObject:newQueryItem];
    [components setQueryItems:newQueryItems];

    url = [components URL];
}