问iOS过滤数组

EN

- (IBAction)anySwitchDidChange:(id)sender
{
    // make a set of all acceptable call types
    NSMutableSet *acceptableCallTypes = [NSMutableSet set];
    if(self.fSwitch.on) [acceptableCallTypes addObject:@"f"];

    // ... etc, to create acceptableCallTypes and acceptableCounties

    NSPredicate *predicate = 
        [NSPredicate predicateWithFormat:
                            @"(%@ contains callType) and (%@ contains county)", 
                            acceptableCallTypes, acceptableCounties];

    /*
       this predicate assumes your objects have the properties 'callType' and 
       'county', and that you've filled the relevant sets with objects that would
       match those properties via isEqual:, whether strings or numbers or
       anything else.

       NSDictionaries are acceptable since the internal mechanism used here is
       key-value coding.
    */

    NSArray *filteredArray = [_sourceArray filteredArrayUsingPredicate:predicate];

    // send filteredArray to wherever it needs to go
}