uisearchbar点击时下边有阴影原来是苹果自带的控件UISearchDisplayController

本文介绍如何使用 UISearchDisplayController 实现搜索功能，包括设置搜索栏、自定义搜索结果显示等，并提供完整的代码示例。

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转载自：http://www.devdiv.com/uisearchdisplaycontroller_-blog-243602-50843.html

先把我已经实现的代码岾出来吧，不保证完全准确，但确实实现了：

注：头文件中要加上两个委托 <UISearchBarDelegate,UISearchDisplayDelegate>

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section

{

UISearchBar *searchBar = [[UISearchBaralloc]initWithFrame: CGRectMake(0,0,310, 40)];

searchBar.placeholder=@"输入关键词!";

searchBar.delegate =self;

searchBar.keyboardType =UIKeyboardTypeDefault;

searchBar.barStyle =UIBarStyleDefault;

searchBar.backgroundColor = [UIColorlightGrayColor];

UISearchDisplayController *displayCon = [[UISearchDisplayControlleralloc]initWithSearchBar:searchBarcontentsController:self];

displayCon.delegate =self;

displayCon.searchResultsDataSource =self;

displayCon.searchResultsDelegate =self;

for (UIView *subviewin displayCon.searchBar.subviews)

{

if ([subviewisKindOfClass:NSClassFromString(@"UISearchBarBackground")])

{

[subview removeFromSuperview];

break;

}

return [displayCon.searchBarautorelease];

}

-
 (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section

2
{

3
    return tableView==self.searchDisplayController.searchResultsTableView?0:22;

4
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {

// NSString *scope = [[self.searchDisplayController.searchBar scopeButtonTitles]

// objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]];

// [self filterContentForSearchBarText:searchString scope:scope];

return YES;

}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {

// NSString *scope = [[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption];

// [self filterContentForSearchBarText:self.searchDisplayController.searchBar.text scope:scope];

return YES;

}

其实这个应该是官方就有，这里只是记录给自个看看

其实应该比较好理解，UISearchDisplayController里面自带的tableView是继承我们本来创建的tableView，只是对数据进行更换，就能过显示出来了。

通过这样判断

1
-
 (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section

2
{

3
    return tableView==self.searchDisplayController.searchResultsTableView?0:22;

4
}

加入回调

1
UISearchDisplayDelegate

[代码]c#/cpp/oc代码：

1
UISearchDisplayController
 *m_searchDisplayController;

2
  
3
m_searchDisplayController=[[UISearchDisplayController
 alloc] initWithSearchBar:m_ctable.m_searchbar.m_searchbar contentsController:self];//传入创建的tableVIew

4
m_searchDisplayController.delegate =
 self;

5
m_searchDisplayController.searchResultsDataSource
 = self;

6
m_searchDisplayController.searchResultsDelegate
 = self;

[代码]c#/cpp/oc代码：

01
#pragma
 mark -

02
#pragma
 mark Content Filtering

03
 
04
-
 (void)filteredListContentForSearchText:(NSString*)searchText
 scope:(NSString*)scope

05
{

06
    if(nil==m_filteredListContent)

07
        m_filteredListContent=[NSMutableArray new];

08
    [m_filteredListContent
 removeAllObjects];

09
     
10
    for(NSString*
 str in groups)

11
    {

12
        NSArray
 * contactSection = [contactTitles objectForKey:str];

13
        for (NSMutableDictionary
 *eObj in contactSection)

14
        {

15
            if ([[[eObj
 objectForKey:@"name"]
 uppercaseString] rangeOfString:[searchText uppercaseString]].length>0)

16
            {

17
                [m_filteredListContent
 addObject:eObj];

18
            }

19
        }

20
    }

21
}

22
 
23
#pragma
 mark -

24
#pragma
 mark UISearchDisplayController Delegate Methods

25
 
26
-
 (void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController
 *)controller {

27
     
28
    UISearchBar
 *searchBar = self.searchDisplayController.searchBar;

29
     
30
    [searchBar
 setShowsCancelButton:YES animated:YES];

31
     
32
    for(UIView
 *subView in searchBar.subviews){

33
         
34
        if([subView
 isKindOfClass:UIButton.class]){

35
             
36
            [(UIButton*)subView
 setTitle:@"取消11111" forState:UIControlStateNormal];

37
             
38
        }

39
         
40
    }

41
     
42
}

43
 
44
//-
 (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString

45
//

46
//{

47
//   

48
////   
 [self filterContentForSearchText:searchString];

49
////   

50
////   
 if ([filteredListPinYin count] == 0) {

51
//   

52
//       
 UITableView *tableView1 = self.searchDisplayController.searchResultsTableView;

53
//       

54
//       
 for( UIView *subview in tableView1.subviews ) {

55
//           

56
//           
 if( [subview class] == [UILabel class] ) {

57
//               

58
//               
 UILabel *lbl = (UILabel*)subview; // sv changed to subview.

59
//               

60
//               
 lbl.text = @"没有结果";

61
//               
 return YES;

62
//               

63
//           
 }

64
//           

65
//       
 }

66
//   
 return YES;

67
//}

68
 
69
-
 (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString

70
{

71
    [self
 filteredListContentForSearchText:searchString scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];

72
     
73
    return YES;

74
}

75
 
76
-
 (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption

77
{

78
    [self
 filteredListContentForSearchText:[self.searchDisplayController.searchBar text] scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];

79
     
80
    return YES;

81
}