iOS开发实战之搜索控制器UISearchController使用

当tableView中的数据过多的时候，在tableView上加一个搜索框就变的很必要了，本文就讨论搜索控制器的使用，以及谓词的简单实现。

.m文件中代码如下 添加搜索控制器的各种协议

<UISearchBarDelegate,UISearchResultsUpdating,UIAlertViewDelegate>

创建两个实例和数据源

{ NSArray * _dataSource; } @property(nonatomic,strong)UISearchController *searchController;//搜索控制器 @property (strong, nonatomic)NSMutableArray *searchList;//满足搜索条件的数组

初始化搜索控制器的各种属性

-(void)initMysearchBarcontroller { _searchController=[[UISearchController alloc]initWithSearchResultsController:nil]; //设置背景不透明 _searchController.searchBar.translucent=NO; _searchController.searchBar.barTintColor=[UIColor brownColor]; //设置searchbar的边框颜色和背景颜色一致 _searchController.searchBar.layer.borderWidth=1; _searchController.searchBar.layer.borderColor=[[UIColor brownColor] CGColor]; _searchController.searchBar.placeholder=@"搜索联系人"; _searchController.searchResultsUpdater = self; _searchController.dimsBackgroundDuringPresentation = NO; _searchController.hidesNavigationBarDuringPresentation = NO; _searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44); _searchController.searchBar.delegate=self; self.tableView.tableHeaderView = self.searchController.searchBar; //清空tableview多余的空格线 [self.tableView setTableFooterView:[[UIView alloc]initWithFrame:CGRectZero]]; }

在输入搜索框中输入文本执行的代理函数

//每输入一个字符都会执行一次 -(void)updateSearchResultsForSearchController:(UISearchController *)searchController { NSString *searchString = [self.searchController.searchBar text]; //谓词搜索 NSPredicate *preicate = [NSPredicate predicateWithFormat:@"SELF.name CONTAINS[c] %@", searchString]; if (self.searchList!= nil) { [self.searchList removeAllObjects]; } //过滤数据 self.searchList= [NSMutableArray arrayWithArray:[_dataSource filteredArrayUsingPredicate:preicate]]; //刷新表格 [self.tableView reloadData]; }

在这个时候 就可以获得符合你的搜索条件的数值了。 如果你想改变tableView的显示内容，记得reloadData。

NSPredicate *preicate = [NSPredicate predicateWithFormat:@"SELF.name CONTAINS[c] %@", searchString];

这里的SELF.name就是你数据源里的model的属性。SELF就是model的类，这里是按照名字搜索。

获取到筛选数组后，就要改你的tableView上显示的东西了。 例如：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { //控制器使用的时候，就是点击了搜索框的时候 if (self.searchController.active) { return self.searchList.count; } //控制器未使用的时候 return _dataSource.count; }

还有其他tableView的代理函数也要改。

全部写完后，会发现点了搜索框之后右边有个取消的英文。怎么变中文呢，如下

-(BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar { [searchBar setShowsCancelButton:YES animated:YES]; for (id obj in [searchBar subviews]) { if ([obj isKindOfClass:[UIView class]]) { for (id obj2 in [obj subviews]) { if ([obj2 isKindOfClass:[UIButton class]]) { UIButton *btn = (UIButton *)obj2; [btn setTitle:@"取消" forState:UIControlStateNormal]; } } } } return YES; }

怎么截取那个取消按钮的代理呢，给你官方的。

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar; // return NO to not become first responder - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar; // called when text starts editing - (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar; // return NO to not resign first responder - (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar; // called when text ends editing - (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText; // called when text changes (including clear) - (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text NS_AVAILABLE_IOS(3_0); // called before text changes - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar; // called when keyboard search button pressed - (void)searchBarBookmarkButtonClicked:(UISearchBar *)searchBar __TVOS_PROHIBITED; // called when bookmark button pressed - (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar __TVOS_PROHIBITED; // called when cancel button pressed - (void)searchBarResultsListButtonClicked:(UISearchBar *)searchBar NS_AVAILABLE_IOS(3_2) __TVOS_PROHIBITED; // called when search results button pressed - (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope NS_AVAILABLE_IOS(3_0);

原文链接：https://blog.csdn.net/clmd_ld/article/details/50782510/

转载于:https://www.cnblogs.com/lishanshan/p/10107782.html

相关资源：数据结构—成绩单生成器