用NSPredicate实现tableView的检索功能

假如在ViewDidLoad中往页面中添加一个UITextField来输入检索内容

    UITextField *searchText=[[UITextField alloc]init];
    searchText.frame=CGRectMake(0, 0, 250, 30);
    searchText.placeholder=@"输入搜索内容";
    searchText.font=[UIFont systemFontOfSize:15];
    searchText.textColor=[UIColor redColor];
    searchText.borderStyle=UITextBorderStyleRoundedRect;
    searchText.delegate=self;
    searchText.returnKeyType = UIReturnKeyDone;
    [searchText addTarget:self action:@selector(search:) forControlEvents:UIControlEventEditingChanged];
//    [self.view addSubview:searchText];
    self.navigationItem.titleView = searchText;

 

-(void)search:(UITextField *)textField{
    if ([textField.text length] == 0) {
        [self viewDidLoad];
        [self.fontsTableViwe reloadData];
        return;
    }
    
    NSString *regex = [NSString stringWithFormat:@"SELF LIKE[c]'%@*'", textField.text];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:regex];
    
    NSArray *array=[self.fontsArray filteredArrayUsingPredicate:predicate];
    
    //重新对检索后的数组进行分组
    self.fontsKeysDic=[[NSMutableDictionary alloc]init];
    self.fontsValuesArr=[[NSMutableArray alloc]init];
    NSString *fontsHeader=@"A";
    for (NSString *fontsValue in array) {
        if ([fontsValue hasPrefix:fontsHeader]) {
            [self.fontsValuesArr addObject:fontsValue];
        }
        else{
            //另一组
            fontsHeader=[fontsValue substringToIndex:1];
            self.fontsValuesArr=[[NSMutableArray alloc]init];
            [self.fontsValuesArr addObject:fontsValue];
        }
        [self.fontsKeysDic setObject:self.fontsValuesArr forKey:fontsHeader];
    }
    //end 分组完成


    [self.fontsTableViwe reloadData];
}