iOS开发---简单地搜索

iOS8之后我们就可以直接运用UISearchController的代理方法进行开发，不用再UIsearch和其他的一下东西了，我就直接给大家上代码吧

UISearchBarDelegate,UISearchResultsUpdating这两个代理方法

viewdidload：

self.dataList=[NSMutableArray arrayWithCapacity:100];
    
    for (NSInteger i=0; i<100; i++) {
        [self.dataList addObject:[NSString stringWithFormat:@"%ld-FlyElephant",(long)i]];
    }
    ALog(@"-====%lu",(unsigned long)self.dataList.count);
  tableview =[[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStylePlain];
    tableview.delegate =self;
    tableview.dataSource =self;
    [self.view addSubview:tableview];
  _search =[[UISearchController alloc]initWithSearchResultsController:nil];
    _search.searchResultsUpdater =self;
    _search.dimsBackgroundDuringPresentation = NO;
    _search.hidesNavigationBarDuringPresentation = NO;
    _search.searchBar.frame = CGRectMake(_search.searchBar.frame.origin.x, _search.searchBar.frame.origin.y, _search.searchBar.frame.size.width, 44);
//当做表的头视图
    tableview.tableHeaderView = _search.searchBar;

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//一定要判断状态
    if (_search.active) {
        return [self.searchList count];
    }
    else{
        return [self.dataList count];
    }
}
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  
        static NSString *flag=@"cellFlag";
        UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:flag];
        if (cell==nil) {
            cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:flag];
        }
        if (_search.active) {
            [cell.textLabel setText:self.searchList[indexPath.row]];
        }
        else{
            [cell.textLabel setText:self.dataList[indexPath.row]];
        }
        return cell;
  
}
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController
{
   NSString *searchString =[_search.searchBar  text];
//筛选语句
    NSPredicate *predicate =[ NSPredicate predicateWithFormat:@"SELF CONTAINS[c]%@",searchString];
    if (self.searchList !=nil) {
        [self .searchList  removeAllObjects];
    }
    
    self.searchList = [NSMutableArray  arrayWithArray:[self.dataList filteredArrayUsingPredicate:predicate]];
    ALog(@"-==%ld",self.searchList.count);
    [tableview  reloadData];
    
}