Question

Hey i want to filter an NSArray. In this Array is a lot of information like name, town, telephonenumber, and so on. But some towns are twice or three times in the array.
I have property with a town in it.
So i want only those objects from the arry which match with the property.

For example:
in the Array stands:

1. Frank, New York, 123456
2. Oliver, New York, 123456
3. Thomas, Boston, 123456

and when the property is New York i want olny objects 1 and 2.

Does anyone has an idea how i can do it?

This is my code:

NSString *filterString = newsArticle;
NSPredicate *prediacte = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"Ort == '%@'",filterString]];
newsTownArray = [news filteredArrayUsingPredicate:predicate];

and when i come to the line:

cell.textLabel.text=[[newsTownArray objectAtIndex:indexPath.row] objectForKey:"Name"];

Answer 1

You need to use NSPredicate for this.

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"town == 'New York'"];
[yourArray filterUsingPredicate:predicate];

Dynamically you can create predicate like:

NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"town == '%@'",yourInput]];

Here yourInput is a NSString which holds the required town name.

Please check these articles for more details:

1. codeproject
2. useyourloaf