如果有匹配项，如何在数组上执行搜索，然后将这些项目复制到ipad应用程序中的另一个数组中

Question

I have a app in which i want searching. I have a array resultArray which contain all the things which display like

 Book*bookObj=[resultArray objectAtIndex.indexPath.row];
 NSString*test=bookObj.title;

I want to perform search on title item in resultArray if search text enter in textfield matches with title with any of the arrays then copy those all array values in testArray.

Answer 1

- (NSArray *)filteredArrayUsingPredicate:(NSPredicate *)predicate is exactly the function that you want. It will return a new array with only the elements that pass the test in the NSPredicate object.

For example:

NSArray *newArray = [oldArray filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(Book *evaluatedObject, NSDictionary *bindings) {
    //Do whatever logic you want to in here
    return [evaluatedObject.title isEqualToString:theTitle];
}];

Answer 2

You have to take another array for this. this will add your object

for (Book * bookObj in resultArray) {
         NSString *strName=[[bookObj.title]lowercaseString];
         if ([strName rangeOfString:searchText].location !=NSNotFound) {
                [arrTemp addObject:bookObj];
            }
        }

Answer 3

Use this as :

   NSMutableArray *searchDataMA = [NSMutableArray new];

       for (int i = 0; i < resultArray.count; i++) {

         Book *bookObj=[resultArray objectAtIndex:i];
         NSString*test=bookObj.title;
        NSRange rangeValue1 = [test rangeOfString:searchText options:NSCaseInsensitiveSearch];

        if (rangeValue1.length != 0) {

            if (![resultArray containsObject:test]) {
                [searchDataMA addObject:test];
            }

        }
    }

Answer 4

It works for me try this:

NSArray *fruits = [NSArray arrayWithObjects:@"Apple", @"Crabapple", @"Watermelon", @"Lemon", @"Raspberry", @"Rockmelon", @"Orange", @"Lime", @"Grape", @"Kiwifruit", @"Bitter Orange", @"Manderin", nil];
NSPredicate *findMelons = [NSPredicate predicateWithFormat:@"SELF contains[cd] 'melon'"];
NSArray *melons = [fruits filteredArrayUsingPredicate:findMelons];
NSPredicate *findApple = [NSPredicate predicateWithFormat:@"SELF beginswith 'Apple'"];
NSArray *apples = [fruits filteredArrayUsingPredicate:findApple];
NSPredicate *findRNotMelons = [NSPredicate predicateWithFormat:@"SELF beginswith 'R' AND NOT SELF contains[cd] 'melon'"];
NSArray *rNotMelons = [fruits filteredArrayUsingPredicate:findRNotMelons];

NSLog(@"Fruits: %@", fruits);
NSLog(@"Melons: %@", melons);
NSLog(@"Apples: %@", apples);
NSLog(@"RNotMelons: %@", rNotMelons);

Predicates also have more condition functions, some of which I have only touched on here:

beginswith : matches anything that begins with the supplied condition
contains : matches anything that contains the supplied condition
endswith : the opposite of begins with
like : the wildcard condition, similar to its SQL counterpart. Matches anything that fits the wildcard condition
matches : a regular expression matching condition. Beware: quite intense to run

The syntax also contains the following other function, predicates and operations:

AND (&&), OR (||), NOT (!)
ANY, ALL, NONE, IN
FALSE, TRUE, NULL, SELF

Still if don't understand take a look at this link;

Useful link