Apply Nspredicate on [(String, Array<String>)]

Apply NSPredicate on [(String, ArrayString)]

Since your array contains tuples, instead of using NSPredicate, you can use the following method for filtering your data:

func getFilteredData(data : [(String, Array<String>)], ltrToCompare : String) -> [(String, Array<String>)]
{
    // For keeping the filtered result
    var returnData = [(String, Array<String>)]()

    // Looping through parent array        
    for (letter, arr) in data
    {
        // Filters the internal array [String]
        let filter = arr.filter()
        {
            return $0.lowercaseString.rangeOfString(ltrToCompare.lowercaseString) != nil
        }

        // Checks whether the inner array filtering returns any element
        if (filter.count != 0)
        {
            returnData.append((letter, filter));
        }
    }
    return returnData
}

Call that method from:

func updateSearchResultsForSearchController(searchController: UISearchController)
{
      data = getFilteredData(data, ltrToCompare: searchController.searchBar.text)
      //reload tableView with fresh data
      self.tableView.reloadData()
}

Search array of array of strings with NSPredicate

You need to use ANY SELF.

let pairs = [["key1","value1"],["key2","value2"]]
let searchPredicate = NSPredicate(format: "ANY SELF CONTAINS[c] %@", "lue2")
let searcher = (pairs as NSArray).filteredArrayUsingPredicate(searchPredicate)
println(searcher) // Prints the second element

From the official documentation for ANY:

Specifies any of the elements in the following expression.

iOS: How to use NSPredicate to filter string *Array

First of all, You need to convert an array of NSString to an array of NSDate to apply filter with NSDate. Please use the below code to achieve your requirement.

Code:

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy/MM"];

NSMutableArray *muarray  = @[
                             @"2019/6",@"2019/5",@"2019/4",@"2019/3",@"2019/2",@"2019/1",@"2018/12",@"2018/11",@"2018/10",@"2018/9",@"2018/8",@"2018/7",@"2018/6",@"2018/5",@"2018/4",@"2018/3",@"2018/2",@"2018/1",@"2017/12",@"2017/11",@"2017/10",@"2017/9",@"2017/8",@"2017/7",@"2017/6",@"2017/5",@"2017/4",@"2017/3",@"2017/2",@"2017/1"
                             ].mutableCopy;

NSMutableArray* aryDates = [NSMutableArray new];
for (NSString* strDate in muarray) {
    NSDate *dateFromString = [dateFormatter dateFromString:strDate];
    [aryDates addObject:dateFromString];
}
NSDate* date1 = [dateFormatter dateFromString:@"2017/8"];
NSDate* date2 = [dateFormatter dateFromString:@"2018/8"];

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF BETWEEN %@", [NSArray arrayWithObjects:date1, date2, nil]];
[aryDates filterUsingPredicate:predicate];
NSLog(@"%@",aryDates);

Predicate to filter array of strings in SWIFT throws error saying NSCFString is not key-value coding

NSPredicate(format:) strongly expects to be used with printf-style format strings (it automatically quotes arguments as it inserts them, etc).

You're using Swift's string interpolation, so the already-formatted query comes to NSPredicate as a single string. That keeps it from doing whatever voodoo it does with arguments, leaving you with a malformed query.

Use printf-style formatting instead:

if let predicate = NSPredicate(format: "SELF CONTAINS %@", searchText) {
    self.listItemToBeDisplayed = (listItem as NSArray).filteredArrayUsingPredicate(predicate)
    (self.view.viewWithTag(1) as UITableView).reloadData()
}

Using NSPredicate to search an array with an array

Considering array contains card Object.

 NSArray *keyWordsList = [keywords componentSeparatedByString:@","];
 [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"ANY %K IN %@",@"tags",keyWordsList]]

EDIT:

To search partially you can use LIKE operator.

[array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"ANY %K LIKE[cd] %@",@"tags",[partialkeyWord stringByAppendingString:@"*"]]]

How to use NSPredicate to filter an array stored in CoreData?

You cannot do that. Check this answer core data array of string filter

You might consider to have an entity for tags, or join the array of tags and have it as a whole string in your current entity, thus having the tags property as type String. For the last approach, you could search with the predicate below.

 NSPredicate(format: "tags CONTAINS[cd] %@", searchText)

The [cd] expression is to specify case and diacritic insensitivity respectively.
You can get know more about the Core Data operations here.

I got some basic operators from the documentation and put them below:

BEGINSWITH
The left-hand expression begins with the right-hand expression.

CONTAINS
The left-hand expression contains the right-hand expression.

ENDSWITH
The left-hand expression ends with the right-hand expression.

LIKE
The left hand expression equals the right-hand expression: ? and * are allowed as wildcard characters, where ? matches 1 character and * matches 0 or more characters.

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