美团HD(8)-利用NSPredicate匹配搜索结果

监听文本框改变：

DJSelectCityViewController.m

/** 当searchBar内的文字发生改变时调用此方法 */
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {

    UIView *cover = [self.view viewWithTag:DJCoverTag];
    if (searchText.length) { // 当前输入内容不为空
        if(cover.subviews.count <= ) {
            cover.alpha = 1.0;
            self.searchResultVC.view.frame = CGRectMake(, , cover.width, cover.height);
            [cover addSubview:self.searchResultVC.view];
        }
        // 将当前内容传递给 DJSearchCityResultViewController 以进行搜索
        [self.searchResultVC setSearchText:searchText];
    } else { // 当前输入内容为空
        [self.searchResultVC.view removeFromSuperview];
         cover.alpha = 0.2;
    }

}

DJSearchCityResultViewController.m

#import "DJSearchCityResultViewController.h"
#import "MJExtension.h"
#import "DJCity.h"

@interface DJSearchCityResultViewController ()

/** 城市列表 */
@property (nonatomic,strong) NSArray *citiesList;
/** 搜索匹配到的结果 */
@property (nonatomic,strong) NSArray *matchSearchResults;

@end

@implementation DJSearchCityResultViewController

/** 加载城市列表 */
- (NSArray *)citiesList {

    if (!_citiesList) {
        _citiesList = [DJCity mj_objectArrayWithFilename:@"cities.plist"];
    }
    return _citiesList;
}

- (void)viewDidLoad {
    [super viewDidLoad];

}

/** 设置搜索内容 */
- (void)setSearchText:(NSString *)searchText {

    // 将待搜索字符串转换成小写
    NSString *searchFormat = searchText.lowercaseString;
    // 使用谓词进行搜索
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name contains %@ or pinYin contains %@ or pinYinHead contains %@",searchFormat,searchFormat,searchFormat];
    self.matchSearchResults = [self.citiesList filteredArrayUsingPredicate:predicate];
    // 匹配完成后刷新tableView
    [self.tableView reloadData];

}

#pragma mark - UITableView数据源方法
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return self.matchSearchResults.count;

}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {

    return [NSString stringWithFormat:@"搜索到%ld条结果",self.matchSearchResults.count];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *ID = @"matchResult";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
    }
    DJCity *city = self.matchSearchResults[indexPath.row];
    cell.textLabel.text = city.name;
    return cell;
}

@end

最终结果：