UISearchController的使用
- (void)addSearchController
{
_searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
_searchController.delegate = self;
_searchController.searchResultsUpdater = self;
// 必须要让searchBar自适应才会显示
[_searchController.searchBar sizeToFit];
_searchController.searchBar.delegate = self;
[_searchController.searchBar setAutocapitalizationType:UITextAutocapitalizationTypeNone];
_searchController.searchBar.backgroundImage = [UIImage imageWithColor:kAppBakgroundColor];
_searchController.searchBar.placeholder = @"用户ID/昵称";
_searchController.hidesNavigationBarDuringPresentation = NO;
_searchController.dimsBackgroundDuringPresentation = NO;
self.definesPresentationContext = NO;
//把searchBar 作为 tableView的头视图
self.tableView.tableHeaderView = _searchController.searchBar;
}
//把searchBar 作为 tableView的头视图
self.tableView.tableHeaderView = _searchController.searchBar;
#pragma mark - UISearchController的代理
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController
{
if (self.searchResults.count) {
[self.searchResults removeAllObjects];
}
NSPredicate *searchPredicate = [NSPredicate predicateWithFormat:@"userId CONTAINS[c] %@",searchController.searchBar.text];
NSArray *array = [(NSArray *)self.searchArray filteredArrayUsingPredicate:searchPredicate];
self.searchResults = [NSMutableArray arrayWithArray:array];
//刷新表格
[self.tableView reloadData];
}
在tableView中使用时，可以根据_searchController.active的属性来判断是否显示搜索到的数据
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (_searchController.active) {
return [self.searchResults count];
}else{
id<IMAContactDrawerShowAble> drawer = [_contact objectAtIndex:section];
if ([self isDrawerFolded:drawer])
{
return 0;
}
else
{
return [drawer items].count;
}
}
}
