IOS之表视图添加搜索栏
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1.将Search bar and search display拖动到ViewController中。不要添加Search Bar.

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2.修改ViewController的头文件

#import <UIKit/UIKit.h>@interface IkrboyViewController4 : UIViewController{    NSArray *dataArr;//用于显示表视图的数据    NSArray *allDataArr;//存储所有数据，通过关键词搜索将搜索结果赋值给dataArr}@property (weak, nonatomic) IBOutlet UISearchBar *searchBar;@end

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?3.修改自定义方法initTableViewData。将ScopeBar隐藏是考虑到iphone的显示高度问题。可自行决定。

-(void)initTableViewData{    NSBundle *bundle = [NSBundle mainBundle];    NSString *plistPath = [bundle pathForResource:@"user_head" ofType:@"plist"];    allDataArr = [[NSArray alloc] initWithContentsOfFile:plistPath];    dataArr = [NSArray arrayWithArray:allDataArr];    NSLog(@"table data count = %d",[allDataArr count]);        //设定搜索栏ScopeBar隐藏    [self.searchBar setShowsScopeBar:NO];    [self.searchBar sizeToFit];}

4.添加SearchBar的三个事件触发

//以下三个方法实现SearchBar的搜索功能//当文本内容发生改变时候，向表视图数据源发出重新加载消息- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString{    [self filterContentForSearchText:searchString scope:self.searchBar.selectedScopeButtonIndex];    //YES情况下表视图可以重新加载    return YES;}// 当Scope Bar选择发送变化时候，向表视图数据源发出重新加载消息- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption{    [self filterContentForSearchText:self.searchBar.text scope:searchOption];    // YES情况下表视图可以重新加载    return YES;}//点击cancel按钮的事件- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{    //查询所有    [self filterContentForSearchText:@"" scope:-1];}

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?5.自定义关键词搜索功能

//自定义搜索方法，根据关键词从allDataArr中搜索到满足搜索条件的元素，并将匹配的数组赋值给dataArr，由于dataArr是表视图的数据源，因此表视图的记录也会随之改变。- (void)filterContentForSearchText:(NSString*)searchText scope:(NSUInteger)scope;{    if([searchText length]==0)    {        //查询所有        dataArr = [NSArray arrayWithArray:allDataArr];        NSLog(@"dataArr count = %d",[dataArr count]);        return;    }        NSPredicate *scopePredicate;        switch (scope) {        case 0:            scopePredicate = [NSPredicate predicateWithFormat:@"(SELF.itemName contains[c] %@) OR (SELF.itemImagePath contains[c] %@)",searchText,searchText];            NSLog(@"searchText=%@",searchText);            dataArr =[NSArray arrayWithArray:[allDataArr filteredArrayUsingPredicate:scopePredicate]];            break;        case 1:            scopePredicate = [NSPredicate predicateWithFormat:@"SELF.itemName contains[c] %@",searchText];            dataArr = [NSArray arrayWithArray:[allDataArr filteredArrayUsingPredicate:scopePredicate]];            break;        case 2:            scopePredicate = [NSPredicate predicateWithFormat:@"SELF.itemImagePath contains[c] %@",searchText];            dataArr =[NSArray arrayWithArray:[allDataArr filteredArrayUsingPredicate:scopePredicate]];            break;    }}

?6.修改cellForRowAtIndexPath方法

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *CellIdentifier = @"myTableCell";    MyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];    //add code begin:important,for showing searching results    //不对cell进行空值的判断，会导致在搜索时，找不到对应identifier的cell而报错。    if (cell == nil) {    //搜索结果采用简单表视图cell的style，并非自定义的表视图cell的style        cell = [[MyTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];        NSUInteger row = [indexPath row];        NSDictionary *rowDict = [dataArr objectAtIndex:row];        cell.textLabel.text =  [rowDict objectForKey:@"itemName"];        NSString *imagePath = [rowDict objectForKey:@"itemImagePath"];        cell.imageView.image =  [UIImage imageNamed:imagePath];    }    //add code end    NSUInteger row = [indexPath row];    NSDictionary *rowDict = [dataArr objectAtIndex:row];    cell.label.text =  [rowDict objectForKey:@"itemName"];    NSLog(@"cell.label.text =  %@",[rowDict objectForKey:@"itemName"]);        NSString *imagePath = [rowDict objectForKey:@"itemImagePath"];    cell.image.image = [UIImage imageNamed:imagePath];    NSLog(@"cell.image.image  =  %@",imagePath);        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;        return cell;}

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