有人能指出我在UISearchDisplayController上的范围按钮的文档吗？我正在查看Apple的一个示例，TableSearch，我看不到它们如何填充UISearchBar下面的范围栏。范围栏有
All, Device, Desktop, Portable
我从AppDelegate和MainViewController复制了代码。我不知道这些范围按钮是如何填充的。
在appDelegate中，我看到他们设置了一些产品数据（产品的类型和名称都是NSStrings），
- (void)applicationDidFinishLaunching:(UIApplication *)application
{
// Create and configure the window, navigation controller, and main view controller.
// Create the master list for the main view controller.
NSArray *listContent = [[NSArray alloc] initWithObjects:
[Product productWithType:@"Device" name:@"iPhone"],
[Product productWithType:@"Device" name:@"iPod"],
[Product productWithType:@"Device" name:@"iPod touch"],
[Product productWithType:@"Desktop" name:@"iMac"],
[Product productWithType:@"Desktop" name:@"Mac Pro"],
[Product productWithType:@"Portable" name:@"iBook"],
[Product productWithType:@"Portable" name:@"MacBook"],
[Product productWithType:@"Portable" name:@"MacBook Pro"],
[Product productWithType:@"Portable" name:@"PowerBook"], nil];
// Create and configure the main view controller.
MainViewController *mainViewController = [[MainViewController alloc] initWithNibName:@"MainView" bundle:nil];
mainViewController.listContent = listContent;
[listContent release];
// Add create and configure the navigation controller.
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:mainViewController];
self.navController = navigationController;
[mainViewController release];
[navigationController release];
// Configure and display the window.
[window addSubview:navController.view];
[window makeKeyAndVisible];
然后在他们的MainViewController类中：
/*
File: MainViewController.m
Abstract: Main table view controller for the application.
Version: 1.5
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*/
#import "MainViewController.h"
#import "Product.h"
@implementation MainViewController
@synthesize listContent, filteredListContent, savedSearchTerm, savedScopeButtonIndex, searchWasActive;
#pragma mark -
#pragma mark Lifecycle methods
- (void)viewDidLoad
{
self.title = @"Products";
// create a filtered list that will contain products for the search results table.
self.filteredListContent = [NSMutableArray arrayWithCapacity:[self.listContent count]];
// restore search settings if they were saved in didReceiveMemoryWarning.
if (self.savedSearchTerm)
{
[self.searchDisplayController setActive:self.searchWasActive];
[self.searchDisplayController.searchBar setSelectedScopeButtonIndex:self.savedScopeButtonIndex];
[self.searchDisplayController.searchBar setText:savedSearchTerm];
self.savedSearchTerm = nil;
}
[self.tableView reloadData];
self.tableView.scrollEnabled = YES;
}
- (void)viewDidUnload
{
self.filteredListContent = nil;
}
- (void)viewDidDisappear:(BOOL)animated
{
// save the state of the search UI so that it can be restored if the view is re-created
self.searchWasActive = [self.searchDisplayController isActive];
self.savedSearchTerm = [self.searchDisplayController.searchBar text];
self.savedScopeButtonIndex = [self.searchDisplayController.searchBar selectedScopeButtonIndex];
}
- (void)dealloc
{
[listContent release];
[filteredListContent release];
[super dealloc];
}
#pragma mark -
#pragma mark UITableView data source and delegate methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
/*
If the requesting table view is the search display controller's table view, return the count of
the filtered list, otherwise return the count of the main list.
*/
if (tableView == self.searchDisplayController.searchResultsTableView)
{
return [self.filteredListContent count];
}
else
{
return [self.listContent count];
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *kCellID = @"cellID";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
/*
If the requesting table view is the search display controller's table view, configure the cell using the filtered content, otherwise use the main list.
*/
Product *product = nil;
if (tableView == self.searchDisplayController.searchResultsTableView)
{
product = [self.filteredListContent objectAtIndex:indexPath.row];
}
else
{
product = [self.listContent objectAtIndex:indexPath.row];
}
cell.textLabel.text = product.name;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UIViewController *detailsViewController = [[UIViewController alloc] init];
/*
If the requesting table view is the search display controller's table view, configure the next view controller using the filtered content, otherwise use the main list.
*/
Product *product = nil;
if (tableView == self.searchDisplayController.searchResultsTableView)
{
product = [self.filteredListContent objectAtIndex:indexPath.row];
}
else
{
product = [self.listContent objectAtIndex:indexPath.row];
}
detailsViewController.title = product.name;
[[self navigationController] pushViewController:detailsViewController animated:YES];
[detailsViewController release];
}
#pragma mark -
#pragma mark Content Filtering
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
/*
Update the filtered array based on the search text and scope.
*/
[self.filteredListContent removeAllObjects]; // First clear the filtered array.
/*
Search the main list for products whose type matches the scope (if selected) and whose name matches searchText; add items that match to the filtered array.
*/
for (Product *product in listContent)
{
if ([scope isEqualToString:@"All"] || [product.type isEqualToString:scope])
{
NSComparisonResult result = [product.name compare:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])];
if (result == NSOrderedSame)
{
[self.filteredListContent addObject:product];
}
}
}
}
#pragma mark -
#pragma mark UISearchDisplayController Delegate Methods
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self filterContentForSearchText:searchString scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption
{
[self filterContentForSearchText:[self.searchDisplayController.searchBar text] scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
@end
答案 0 :(得分：1)
您可以设置一个字符串数组，用作每个范围按钮的标题。这些可以在InterfaceBuilder中设置，也可以在代码中设置如下：
self.mainSearchBar.scopeButtonTitles = [NSArray arrayWithObjects:@"All", @"Device", @"Desktop", @"Portable", nil];
您还需要将showsScopeBar设置为YES。
self.mainSearchBar.showsScopeBar = YES;
答案 1 :(得分：1)
打开MainWindow.xib并选择SearBar控件。在实用程序窗格中，您将看到填充范围栏标题。