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

Just a friendly post for those who don't want to write boilerplate code while building NSURL with NSURLComponents.
Since iOS8 we have NSURLQueryItem that helps building URL request freaking fast.

I wrote a little handy category to ease the work, that you can grab here: URLQueryBuilder
Here is example of how easy it is to work with it:

NSString *baseURL = @"https://google.com/search";
NSDictionary *items = @{
    @"q"  : @"arsenkin.com",
    @"hl" : @"en_US",
    @"lr" : @"lang_en"
};

NSURL *URL = [NSURL ars_queryWithString:baseURL queryElements:items];  
// https://google.com/search?q=arsenkin.com&hl=en_US&lr=lang_en