Hi Readers,

In iOS app many times we have to filter our results according to requirement. We can filter array of results same as following example. Let say we have an array(articleArray) like:

(
        {
        Read = 0;
        Saved = 0;
        Shared = 0;
author = 10;
"comment_status" = open;
date = "2016-07-06T13:10:13";
"primary_type" = article;
}

        {
        Read = 0;
        Saved = 0;
        Shared = 0;
author = 10;
"comment_status" = open;
date = "2016-07-06T13:10:13";
"primary_type" = audio;
}

        {
        Read = 0;
        Saved = 0;
        Shared = 0;
author = 10;
"comment_status" = open;
date = "2016-07-06T13:10:13";
"primary_type" = audio;
}

        {
        Read = 0;
        Saved = 0;
        Shared = 0;
author = 10;
"comment_status" = open;
date = "2016-07-06T13:10:13";
"primary_type" = article;
}

        {
        Read = 0;
        Saved = 0;
        Shared = 0;
author = 10;
"comment_status" = open;
date = "2016-07-06T13:10:13";
"primary_type" = video;
}

        {
        Read = 0;
        Saved = 0;
        Shared = 0;
author = 10;
"comment_status" = open;
date = "2016-07-06T13:10:13";
"primary_type" = video;
}
)

And we have to filler objects according to article_type. Let say we have to check for video and audio only. We need to first make an array with these two string like:

let filterArray = ["audio", "video"]

We need to make predicate for filter like:

let namePredicate = NSPredicate(format:"primary_type IN %@",filterArray)

We will then applied this predicate on our array like:

let filteredArray = newfeaturedArticlesArray.filter {namePredicate.evaluateWithObject($0) };

With this code snippet will filter all audio and video article into filteredArray and you can use if for filtering results accordingly.

Thanks for reading :)