在ios开发中搜索条的使用挺常见的,不过之前一直没用到也没细细研究,最近做外包项目的时候刚好用到,在这里记录一下使用的过程,只要理解了原理,其实还是比较简单的!上传的图片有点大,刚好可以看清楚它的使用效果!

ios开发搜索栏 ios15 搜索条在下方_ci

  我喜欢一步步的解析控件使用过程,其实真正的用心做一件事情是很享受的,虽然现在的社会都很注重效率和回报,这也是中国这种社会环境下难出大师级的人物的很重要的一个因素。扯得有点远了,只是希望国内开发者不要太急功近利,熟练应用本不是难事,一点点积累就好。下面开始搜索条 

UISearchBar 和 UISearchDisplayController 的使用介绍。

第一步:添加UISearchBarDelegate,UISearchDisplayDelegate 委托
  第二步:就是UISearchBar 和UISearchDisplayController的使用
 //搜索框
    self.searchBar = [[[UISearchBar alloc] initWithFrame:CGRectMake(10, 15, self.view.bounds.size.width-20, 45)]autorelease];
    searchBar.placeholder=@"输入城市名或拼音";
    searchBar.delegate = self;
    searchBar.backgroundColor=[UIColor clearColor];
    searchBar.backgroundImage=[UIImage imageNamed:@"搜索背景"];
    searchBar.keyboardType=UIKeyboardTypeDefault;
    myTableView.tableHeaderView = searchBar;
    searchBar.autocorrectionType = UITextAutocorrectionTypeNo;
    searchBar.autocapitalizationType = UITextAutocapitalizationTypeNone;
    
    
    self.searchdispalyCtrl = [[[UISearchDisplayController  alloc] initWithSearchBar:searchBar contentsController:self]autorelease];
    //设置取消按钮文字颜色
    searchdispalyCtrl.searchBar.tintColor=BB_Yanzheng_Color;
    //search dispalyCtrl.active = NO;
    //[searchdispalyCtrl.searchResultsTableView setHidden:NO];
    searchdispalyCtrl.delegate = self;
    searchdispalyCtrl.searchResultsDelegate=self;
    searchdispalyCtrl.searchResultsDataSource = self;

  这里面有两个点需要注意一下,一个是 myTableView.tableHeaderView = searchBar;这里是将searchbar放在对应列表的第一个section之中,而且section的高度不用设置,当然可以通过addsubview添加这种方式会产生一种移位,建议默认的方式比较好些!另一点是UISearchDisplayController是对searchbar的进一步封装,里面的东西确实简化了好多,可以采用这种方法设置取消按钮文本的颜色searchdispalyCtrl.searchBar.tintColor=BB_Yanzheng_Color;

  第三步:相关委托的使用

我们通过实验发现点击searchbar的输入框会弹出一个独立的tableview视图,并显示一个取消按钮,搜索的数据显示在这个独立的视图列表中。而这个视图列表和普通的列表用法一样,需要设置

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 
{
 
    if (tableView == self.searchDisplayController.searchResultsTableView)
 
    {
 
        return 1;
 
    }
 
    else
 
    {
 
        return 26;
 
    }
 
}
 
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 
{
 
    if (tableView == self.searchDisplayController.searchResultsTableView)
 
    {
 
        NSLog(@"我去:%@",searchResult);
 
        return [searchResult count];
 
    }
 
    else
 
    {
 
        if (section==0||section==1||section==2||section==3)
 
        {
 
            return 1;
 
        }
 
        if (isZiMu)
 
        {
 
            NSLog(@"zimugeshu:%@,%d",[zimuList objectAtIndex:section-4],[[cityGroupList objectForKey:[zimuList objectAtIndex:section-4]]count]);
 
            return [[cityGroupList objectForKey:[zimuList objectAtIndex:section-4]]count];
 
        }
 
       
 
        /*
 
        char mychar='a';
 
        //当前字母
 
        NSString *zimu=[NSString stringWithFormat:@"%c",mychar-32];
 
        
 
        //NSString *zimu=[NSString stringWithFormat:@"%c",c];
 
        if (![zimu isEqualToString:@"i"]&&![zimu isEqualToString:@"o"]&&![zimu isEqualToString:@"u"]&&![zimu isEqualToString:@"v"])
 
        {
 
            NSLog(@"zimugeshu:%@,%d",zimu,[[cityGroupList objectForKey:zimu]count]);
 
            return [[cityGroupList objectForKey:[zimuList objectAtIndex:section-4]]count];
 
            
 
        }*/
 
       
 
        return 0;
 
        
 
    }
 
    
 
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (tableView == self.searchDisplayController.searchResultsTableView)
    {
        return 45;
    }
    if (indexPath.section==0)
    {
        return 0;
    }
    if (indexPath.section==1||indexPath.section==2)
    {
        return 73;
    }
    if (indexPath.section==3)
    {
        //超过的话固定显示203
        if (17+([remenCityList count]/3+1)*47+18<=223)
        {
            if ([remenCityList count]!=0&&[remenCityList count]%3==0)
            {
                return 17+([remenCityList count]/3)*47;
            }
            return 17+([remenCityList count]/3+1)*47;
        }
        return 223;
    }
    return 45;
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    if (tableView == self.searchDisplayController.searchResultsTableView)
    {
        return 0;
    }
    if (section!=0)
    {
        return 32;
    }
    return 0.01f;
}
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    if (tableView == self.searchDisplayController.searchResultsTableView)
    {
        return 0.01;
    }
    return 0.01f;
}
这些个基本的高度和行数 模块信息,当然列表的显示更是必不可少
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (tableView == self.searchDisplayController.searchResultsTableView)
    {
        static NSString *simpleTableIdentifier = @"RecipeCell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
        if (cell == nil)
        {
            cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier]autorelease];
        }
        else
        {
            for(UIView *view in cell.contentView.subviews)
            {
                [view removeFromSuperview];
            }
        }
        //cell.textLabel.text = [searchResult objectAtIndex:indexPath.row];
        //[cell.textLabel setTextColor:BB_Red_Color];
        //NSLog(@"zheli:%@,%d,%@",[searchResult objectAtIndex:indexPath.row],indexPath.row,self.searchDisplayController.searchResultsTableView);
        
        //城市名称
        UILabel *labLeft = [[[UILabel alloc]init]autorelease];
        labLeft.backgroundColor = [UIColor clearColor];
        labLeft.textAlignment = NSTextAlignmentLeft;
        labLeft.font = [UIFont systemFontOfSize:15];
        labLeft.textColor = [UIColor blackColor];
        labLeft.frame = CGRectMake(15, 15, 200, 15);
        labLeft.text=[searchResult objectAtIndex:indexPath.row];
        [cell.contentView addSubview:labLeft];
        return cell;
    }
}
上面列出的只是显示信息,真正数据的搜索要依赖于下面的委托方法实现
 
#pragma mark - UISearchDisplayDelegate
 
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
 
{
 
    [self filterContentForSearchText:searchString
 
                               scope:[self.searchBar scopeButtonTitles][self.searchBar.selectedScopeButtonIndex]];
 
    
 
    NSLog(@"woshuoba:%@,%@,%d,%@",searchString,self.searchBar.scopeButtonTitles,self.searchBar.selectedScopeButtonIndex,[self.searchBar scopeButtonTitles][self.searchBar.selectedScopeButtonIndex]);
 
    return YES;
 
}
 
-(void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
 
{
 
    NSMutableArray *tempResults = [[[NSMutableArray array]init]autorelease];
 
    NSMutableArray *tempResultsId = [[[NSMutableArray array]init]autorelease];
 
    [tempResults removeAllObjects];
 
    [tempResultsId removeAllObjects];
 
 
 
    NSUInteger searchOptions = NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch;
 
    NSLog(@"sousuo:%@,%@,%@",searchText,scope,storeResults);
 
    for (int i = 0; i < storeResults.count; i++)
 
    {
 
        NSString *storeString = [[storeResults objectAtIndex:i]objectForKey:@"name"];
 
        
 
        NSRange storeRange = NSMakeRange(0, storeString.length);
 
        
 
        NSRange foundRange = [storeString rangeOfString:searchText options:searchOptions range:storeRange];
 
       
 
        
 
        if (foundRange.length)
 
        {
 
             NSLog(@"foundRange:%d,%d",foundRange.length,foundRange.location);
 
            [tempResults addObject:storeString];
 
            [tempResultsId addObject:[[storeResults objectAtIndex:i]objectForKey:@"id"]];
 
        }
 
        
 
        
 
        NSLog(@"wodejieguo:%@,%@",[[storeResults objectAtIndex:i]objectForKey:@"id"],storeString);
 
    }
 
    //清空搜索内容Id
 
    [self.searchResultId removeAllObjects];
 
    [self.searchResult removeAllObjects];
 
    [self.searchResultId addObjectsFromArray:tempResultsId];
 
    [self.searchResult addObjectsFromArray:tempResults];
 
    NSLog(@"searchResult:%@,%@",searchResult,searchResultId);
 
    
 
}

说道这里关于搜索条的使用已经基本完成,当然搜索列表选中跳页可以借助自定义委托来实现,这里就不多少了!