搜索NSArray词典的所有对象

Question

I have implemented the search method for a UITableView populate from a NSArray (mylist):

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope{

    // reset array
    [self.filteredListContent removeAllObjects]; 

    // check the elements contained in the list
    NSString *cellTitle;

    for (cellTitle in myList){  //CHANGE HERE

        NSComparisonResult result = [cellTitle compare:searchText options:NSCaseInsensitiveSearch range:NSMakeRange(0, [searchText length])];
        if (result == NSOrderedSame){
            [filteredListContent addObject:cellTitle];
        }
    }
}

Now i would the same method for search a char in objectForKey:@"name" of a List of NSDictionary :

myList [0]:
{
        gender
        id
        name
        picture }
myList [1]
{
        gender
        id
        name
        picture }

I would something like this:

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope{

    [self.filteredFriendsList removeAllObjects]; 

    NSString *cellTitle;


        for (cellTitle in [[friendsList /* all objects */] objectForKey:@"name"]){

        NSComparisonResult result = [cellTitle compare:searchText options:NSCaseInsensitiveSearch range:NSMakeRange(0, [searchText length])];

        if (result == NSOrderedSame){
            [filteredFriendsList addObject:cellTitle];
        }

        }
}

Someone has some ideas? Thank you.

Answer 1

Why don't you just have the method do:

Friend *friend;

for (friend in friendsList) {
     NSString *cellTitle = [friend objectForKey:@"name"];
     /* do comparison */
}

Answer 2

Try this one:

for (NSString *name in [friendsList valueForKey:@"name"])
{
    if ([name isEqualToString:searchText]) [filteredFriendsList addObject:name];
}

The key here is the fact that valueForKey: method once invoked on an NSArray it calls valueForKey: on every of its objects.

Ps. If you want a case insensitive comparison you can do so like:

NSComparisonResult res = [searchTex caseInsensitiveCompare:name];
if (res == NSOrderedSame) [filteredFriendsList addObject:name];

EDIT: (To include solution for substring matching)

if ([name rangeOfString:searchText].location =! NSNotFound) 
{ 
    // 'name' contains 'searchText' 
}