IOS之表视图添加搜索栏

       下面是我们要实现的效果。本效果是在上一篇自定义表视图的基础上进行更改的。

1.将Search bar and search display拖动到ViewController中。不要添加Search Bar.

2.修改ViewController的头文件

Cpp代码  

1. #import <UIKit/UIKit.h>  
2.   
3. @interface IkrboyViewController4 : UIViewController  
4. {  
5.     NSArray *dataArr;//用于显示表视图的数据  
6.     NSArray *allDataArr;//存储所有数据，通过关键词搜索将搜索结果赋值给dataArr  
7. }  
8. @PRoperty (weak, nonatomic) IBOutlet UISearchBar *searchBar;  
9.   
10. @end  

#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

 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。

Cpp代码  

1. -(void)initTableViewData{  
2.     NSBundle *bundle = [NSBundle mainBundle];  
3.     NSString *plistPath = [bundle pathForResource:@"user_head" ofType:@"plist"];  
4.     allDataArr = [[NSArray alloc] initWithContentsOfFile:plistPath];  
5.     dataArr = [NSArray arrayWithArray:allDataArr];  
6.     NSLog(@"table data count = %d",[allDataArr count]);  
7.       
8.     //设定搜索栏ScopeBar隐藏  
9.     [self.searchBar setShowsScopeBar:NO];  
10.     [self.searchBar sizeToFit];  
11. }  

-(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

Cpp代码  

1. //以下三个方法实现SearchBar的搜索功能  
2. //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  
3. - (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString  
4. {  
5.     [self filterContentForSearchText:searchString scope:self.searchBar.selectedScopeButtonIndex];  
6.     //YES情况下表视图可以重新加载  
7.     return YES;  
8. }  
9.   
10. // 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  
11. - (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption  
12. {  
13.     [self filterContentForSearchText:self.searchBar.text scope:searchOption];  
14.     // YES情况下表视图可以重新加载  
15.     return YES;  
16. }  
17.   
18. //点击cancel按钮的事件  
19. - (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar  
20. {  
21.     //查询所有  
22.     [self filterContentForSearchText:@"" scope:-1];  
23. }  

//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];}

   5.自定义关键词搜索功能

Cpp代码  

1. //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。  
2. - (void)filterContentForSearchText:(NSString*)searchText scope:(NSUInteger)scope;  
3. {  
4.     if([searchText length]==0)  
5.     {  
6.         //查询所有  
7.         dataArr = [NSArray arrayWithArray:allDataArr];  
8.         NSLog(@"dataArr count = %d",[dataArr count]);  
9.         return;  
10.     }  
11.       
12.     NSPredicate *scopePredicate;  
13.       
14.     switch (scope) {  
15.         case 0:  
16.             scopePredicate = [NSPredicate predicateWithFormat:@"(SELF.itemName contains[c] %@) OR (SELF.itemImagePath contains[c] %@)",searchText,searchText];  
17.             NSLog(@"searchText=%@",searchText);  
18.             dataArr =[NSArray arrayWithArray:[allDataArr filteredArrayUsingPredicate:scopePredicate]];  
19.             break;  
20.         case 1:  
21.             scopePredicate = [NSPredicate predicateWithFormat:@"SELF.itemName contains[c] %@",searchText];  
22.             dataArr = [NSArray arrayWithArray:[allDataArr filteredArrayUsingPredicate:scopePredicate]];  
23.             break;  
24.         case 2:  
25.             scopePredicate = [NSPredicate predicateWithFormat:@"SELF.itemImagePath contains[c] %@",searchText];  
26.             dataArr =[NSArray arrayWithArray:[allDataArr filteredArrayUsingPredicate:scopePredicate]];  
27.             break;  
28.     }  
29. }  

//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

Cpp代码  

1. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath  
2. {  
3.     static NSString *CellIdentifier = @"myTableCell";  
4.     MyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];  
5.     //add code begin:important,for showing searching results  
6.     //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。  
7.     if (cell == nil) {  
8.     //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      
9.     cell = [[MyTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];  
10.         NSUInteger row = [indexPath row];  
11.         NSDictionary *rowDict = [dataArr objectAtIndex:row];  
12.         cell.textLabel.text =  [rowDict objectForKey:@"itemName"];  
13.         NSString *imagePath = [rowDict objectForKey:@"itemImagePath"];  
14.         cell.imageView.image =  [UIImage imageNamed:imagePath];  
15.     }  
16.     //add code end  
17.   
18.     NSUInteger row = [indexPath row];  
19.     NSDictionary *rowDict = [dataArr objectAtIndex:row];  
20.     cell.label.text =  [rowDict objectForKey:@"itemName"];  
21.     NSLog(@"cell.label.text =  %@",[rowDict objectForKey:@"itemName"]);  
22.       
23.     NSString *imagePath = [rowDict objectForKey:@"itemImagePath"];  
24.     cell.image.image = [UIImage imageNamed:imagePath];  
25.     NSLog(@"cell.image.image  =  %@",imagePath);  
26.       
27.     cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;  
28.       
29.     return cell;  
30. }  

- (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;}