How to filter NSArray using predicate on an object property

Question

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
  [self.map removeAnnotations:self.map.annotations];
  if ([textField isEqual:self.searchText]) {
      NSPredicate *bPredicate = 
      [NSPredicate predicateWithFormat:@"name contains[c],  %@",self.searchText.text];

      self.filteredArray = [self.hotelArray filteredArrayUsingPredicate:bPredicate];
      NSLog(@" HEARE %@",self.filteredArray);
      [self markAllHotels];
  }
  return YES;
}

hotelArray and filteredArray are NSArrays.

hotelArray has objects of type hotel where hotel has a property name.

Problem : I want to filter hotelArray according to hotel.name when hotel.name matches text entered in searchText [text field], but I am getting an empty self.filteredArray.

Your question is missing. What problems do you exactly have with your posted code? — mAu
– mAu, Commented Oct 30, 2013 at 7:41
@Vishwa Patel that code is not working for me . using ANY is crashing the simulator. — shifu
– shifu, Commented Oct 30, 2013 at 7:53

Dipen Panchasara · Accepted Answer · 2017-11-02 02:03:32Z

72

Try following lines, and make sure properyName is case sensitive. and you have placed , in predicate format, thats why its not working. just replace your code with following.

Objective C

NSPredicate *bPredicate = [NSPredicate predicateWithFormat:@"SELF.name contains[cd] %@",self.searchText.text];
self.filteredArray = [self.hotelArray filteredArrayUsingPredicate:bPredicate];
NSLog(@"HERE %@",self.filteredArray);

Swift

var bPredicate: NSPredicate = NSPredicate(format: "SELF.name contains[cd] %@", self.searchText.text)
self.filteredArray = self.hotelArray.filteredArrayUsingPredicate(bPredicate)
NSLog("HERE %@", self.filteredArray)

Using swift filter

var searchText = "Galaxy"

let filteredArray = hotelArray.filter { $0["name"] == searchText }
print("** Result ** \n\(filteredArray)")

Swift 3.0

let arrEmp = [["name": "James", "age" : 27, "city" : "New york"],
                   ["name": "Johnson", "age" : 24, "city" : "London"],
                   ["name": "Alex", "age" : 28, "city" : "Newark"],
                   ["name": "Mark", "age" : 25, "city" : "Paris"],
                   ["name": "Steve", "age" : 25, "city" : "Silicon Valley"],
                   ["name": "Lary", "age" : 28, "city" : "New york"]]

// *** Filter by Name exact match ***
var filterByName = arrEmp.filter { $0["name"] == "Mark" }
print("filterByName \(filterByName)")

// *** Filter by Age ***
var filterByAge = arrEmp.filter { $0["age"] as! Int >  25 }
print("filterByAge \(filterByAge)")

Swift 4.0

var filterByName = arrEmp.filter
do {
    $0["name"] == "Mark"
}
print("filterByName filterByName)")

var filterByAge = arrEmp.filter
do {
    $0["age"] as! Int > 25
}
print("filterByAge filterByAge)")

edited Nov 2, 2017 at 2:03

answered Oct 30, 2013 at 7:56

Dipen Panchasara

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4 Comments

shifu Over a year ago

[NSString "sometext%i",4] IOS makes it number not string that was the error .

Dipen Panchasara Over a year ago

@Anz are you filtering array of dictionary? Given code is tested on Swift 3.0

Anees Over a year ago

@DipenPanchasara Yes it is

Dipen Panchasara Over a year ago

You can post a question with your data and other information, then one can provide solution

user813891 · Accepted Answer · 2013-10-30 08:06:17Z

5

Based on your information, this is your situation:

self.hotelArray      // Array in which we perform a search
self.filteredArray   // Result array
name                 // Property of the object used for the predicate

This predicate should work for you:

NSString *searchText = self.searchText.text;
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self.name contains[c] %@", searchText];
self.filteredArray = [self.hotelArray filteredArrayUsingPredicate:predicate];

answered Oct 30, 2013 at 8:06

user813891

Comments

Jordi Puigdellívol · Accepted Answer · 2016-08-29 18:07:45Z

2

Checkout this library

https://github.com/BadChoice/Collection

It comes with lots of easy array functions to never write a loop again

So you can just do:

NSArray* hotels = [self.hotelArray filter:^BOOL(Hotel *hotel) {
    [return hotel.name isEqualToString:searchText];
}];

or simply

NSArray* hotels = [self.hotelArray where:@"name" is:searchText];

:)

answered Aug 29, 2016 at 18:07

Jordi Puigdellívol

1,7583 gold badges23 silver badges33 bronze badges

Comments

Dipen Panchasara · Accepted Answer · 2015-12-16 06:03:00Z

1

This is the predicate method that might work for you.

-(void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    [filteredContactArray removeAllObjects];

    NSArray *tempArray = [hotelArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"name contains[c] %@ OR name contains[cd] %@",searchText]];

    filteredArray = [NSMutableArray arrayWithArray:tempArray];//if you want the filtered array to be mutable or tempArray will work as as desired by you.
}

contains[c]- means the predicate with case sensitive. contains[cd]- case insensitive string

edited Dec 16, 2015 at 6:03

Dipen Panchasara

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answered Dec 16, 2015 at 5:59

Devang Tandel

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Comments

zbMax · Accepted Answer · 2013-10-30 07:50:31Z

0

I'm not sure if this is what you want to do :

-(NSArray*)searchString:(NSString*)stringToSearch inArray:(NSArray*)myArray
{
    NSMutableArray* filtredArray = [[NSMutableArray alloc] init];
    for (NSString* elmnt in myArray)
    {
        if ([elmnt rangeOfString:stringToSearch].location != NSNotFound) [fitredArray addObject:elmnt];
    }
    return filtredArray;
}

answered Oct 30, 2013 at 7:50

zbMax

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2 Comments

shifu Over a year ago

i don't wanna loop through elements.

shifu Over a year ago

i wanna use filteredArrayUsingPredicate or something similar

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