iOS开发实战之搜索控制器UISearchController使用
iOS开发实战之搜索控制器UISearchController使用
用户1219438
发布于 2018-12-26 17:32:34
发布于 2018-12-26 17:32:34
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/
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原始发表：2018-12-12 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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