微信自定义搜索框实现

项目介绍：

模仿微信的搜索框效果，自定义SearchController，实现了和系统默认的UISearchController相同的使用方式和代理回调。
和UISearchController相同的初始化方法：
[Actionscript3] 查看源文件 复制代码

- (JKRSearchController *)searchController {
    if (!_searchController) {
        JKRSearchResultViewController *resultSearchController = [[JKRSearchResultViewController alloc] init];
        _searchController = [[JKRSearchController alloc] initWithSearchResultsController:resultSearchController];
        _searchController.searchBar.placeholder = @"搜索";
        _searchController.hidesNavigationBarDuringPresentation = YES;
        _searchController.searchResultsUpdater = self;
        _searchController.searchBar.delegate = self;
        _searchController.delegate = self;
    }
    return _searchController;
}

和UISearchController相同的加载方式：
[Actionscript3] 查看源文件 复制代码

[self.tableView setTableHeaderView:self.searchController.searchBar];

和UISearchController相同的代理回调：
[Actionscript3] 查看源文件 复制代码

#pragma mark - JKRSearchControllerhResultsUpdating
- (void)updateSearchResultsForSearchController:(JKRSearchController *)searchController {
    NSString *searchText = searchController.searchBar.text;
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(SELF CONTAINS %@)", searchText];
    JKRSearchResultViewController *resultController = (JKRSearchResultViewController *)searchController.searchResultsController;
    if (!(searchText.length > 0)) resultController.filterDataArray = @[];
    else resultController.filterDataArray = [self.dataArray filteredArrayUsingPredicate:predicate];
}

#pragma mark - JKRSearchControllerDelegate
- (void)willPresentSearchController:(JKRSearchController *)searchController {
    NSLog(@"willPresentSearchController, %@", searchController);
}

- (void)didPresentSearchController:(JKRSearchController *)searchController {
    NSLog(@"didPresentSearchController, %@", searchController);
}

- (void)willDismissSearchController:(JKRSearchController *)searchController {
    NSLog(@"willDismissSearchController, %@", searchController);
}

- (void)didDismissSearchController:(JKRSearchController *)searchController {
    NSLog(@"didDismissSearchController, %@", searchController);
}

#pragma mark - JKRSearchBarDelegate
- (void)searchBarTextDidBeginEditing:(JKRSearchBar *)searchBar {
    NSLog(@"searchBarTextDidBeginEditing %@", searchBar);
}

- (void)searchBarTextDidEndEditing:(JKRSearchBar *)searchBar {
    NSLog(@"searchBarTextDidEndEditing %@", searchBar);
}

- (void)searchBar:(JKRSearchBar *)searchBar textDidChange:(NSString *)searchText {
    NSLog(@"searchBar:%@ textDidChange:%@", searchBar, searchText);
}

Demo地址：https://github.com/Joker-388/JKRCustomSearchController