【原/转】iOS中非常强大的过滤器:NSPredicate

1 - (void)viewDidLoad {
2     [super viewDidLoad];
3 
4     self.allResults = @[@"Here's", @"to", @"the", @"crazy", @"ones.", @"The", @"misfits.", @"The", @"rebels.", @"The", @"troublemakers.", @"The", @"round", @"pegs", @"in", @"the", @"square", @"holes.", @"The", @"ones", @"who", @"see", @"things", @"differently.", @"They're", @"not", @"fond", @"of", @"rules.", @"And", @"they", @"have", @"no", @"respect", @"for", @"the", @"status", @"quo.", @"You", @"can", @"quote", @"them,", @"disagree", @"with", @"them,", @"glorify", @"or", @"vilify", @"them.", @"About", @"the", @"only", @"thing", @"you", @"can't", @"do", @"is", @"ignore", @"them.", @"Because", @"they", @"change", @"things.", @"They", @"push", @"the", @"human", @"race", @"forward.", @"And", @"while", @"some", @"may", @"see", @"them", @"as", @"the", @"crazy", @"ones,", @"we", @"see", @"genius.", @"Because", @"the", @"people", @"who", @"are", @"crazy", @"enough", @"to", @"think", @"they", @"can", @"change", @"the", @"world,", @"are", @"the", @"ones", @"who", @"do."];
5     
6     self.visibleResults = self.allResults;
7 }

 1 - (void)setFilterString:(NSString *)filterString {
 2     _filterString = filterString;
 3     
 4     if (!filterString || filterString.length <= 0) {
 5         self.visibleResults = self.allResults;
 6     }
 7     else {
 8         NSPredicate *filterPredicate = [NSPredicate predicateWithFormat:@"self contains[c] %@", filterString];
 9         self.visibleResults = [self.allResults filteredArrayUsingPredicate:filterPredicate];
10     }
11     
12     [self.tableView reloadData];
13 }