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POUse NSPredicate for matching id's in two arrays
 

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    <p>Hello i have a maybe easy question but i cant handle it yet.</p> <ul> <li>I have a Modelclass 'Location' which holds an Array with Category ID's (12, 23, 56).</li> <li>Then i have an Array with all available Category ID's (1,2,3,4,5,6,7,...)</li> <li>All this Categories have an ID are shown in a TableView and are able to select or not.</li> <li>I show a punch of Markers on a MapView (Annotation Class is Location) which should be shown based on the selection of the filters in the mentioned Filter TableView.</li> </ul> <p>I need to implement a "Filter by Category" function which removes all markers and add them again but just based on the selection in the list.</p> <p>So i need to compare the array with the filter-id's in the Location Model with the Array with all the Filter-ID's in the TableView. i used the following function for this:</p> <pre><code>for (Location *currLocation in arrListOfLocationsNearby) { </code></pre> <p>for (NSString *currKatId in currLocation.arrKatIds) {</p> <pre><code>NSInteger intCurrKatId = [currKatId integerValue]; NSLog(@"Current KatId %@ id: %d \n", currLocation.strAdr, intCurrKatId); for (Filter *currFilter in [SDM getSharedDataManager].arrListOfFilterOptions) { if (currFilter.isSelected) { NSInteger intCurrFilterId = [currFilter.strAtt_id intValue]; NSLog(@"Current Filter %@ id: %d \n", currFilter.strAtt_text, intCurrFilterId); if ([currKatId intValue] == [currFilter.strAtt_id intValue]) { currLocation.isVisible = YES; }else { currLocation.isVisible = NO; } } } </code></pre> <p>} }</p> <p>I know this will be the most ineffective way to loop through everything. I want to use somehow NSPredicate for this but i never used them before and i can't find examples for my problem.</p> <p>Any Hints from you guys?</p> <p>regards m.</p>
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    1. USJosephH
    1. USgrobald
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    1. COI started answer, got confused, but now I think I get it again. So basically, you have three arrays: one with all the categories, one with the categories that the user has selected in a tableview and one ... -- no, confused again.
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      1. USElise van Looij
 

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