UISearchController

UISearchController在iOS8.0之后替换了原来的UISearchBar，这里介绍一下搭配UITableView的使用；
先上图实现效果如下：

Search.gif

1.xib创建一个VC，并在上面添加一个UITableView添加约束，内容页代码如下：

@interface ApplicationViewController ()<UISearchResultsUpdating>
@property (strong, nonatomic) IBOutlet UITableView *tableView;
@property (strong, nonatomic) UISearchController *searchController;
@end

@implementation ApplicationViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    self.navigationController.navigationBar.translucent = NO;
    self.automaticallyAdjustsScrollViewInsets = NO;
    
    [self.tableView registerNib:[UINib nibWithNibName:@"ApplicationTableViewCell" bundle:nil] forCellReuseIdentifier:@"ApplicationTableViewCell"];
    _tableView.tableHeaderView = self.searchController.searchBar;
    _searchController.searchResultsUpdater = self;
    self.definesPresentationContext = YES;
}

//懒加载搜索控制器
- (UISearchController *)searchController {
    if (!_searchController) {
        SearchResultTableViewController *result = [SearchResultTableViewController new];
        _searchController = [[UISearchController alloc] initWithSearchResultsController:result];
        _searchController.searchBar.frame = CGRectMake(0, 0, SCREEN_WIDTH, 40);
        _searchController.searchBar.placeholder = @"搜索";
        _searchController.searchBar.searchBarStyle = UISearchBarStyleMinimal;
        _searchController.searchBar.barTintColor = [UIColor whiteColor];
        return _searchController;
    }
    return _searchController;
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

#pragma mark UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 10;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    ApplicationTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ApplicationTableViewCell"];
    cell.selectionStyle = NO;
    return cell;
}

#pragma mark UISearchResultsUpdating
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController; {
    
}
@end

2.创建一个继承与UITableViewController的类作为显示搜索内容的VC

#import "SearchResultTableViewController.h"

@interface SearchResultTableViewController ()

@end

@implementation SearchResultTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
    
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 10;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
    
    
    
    return cell;
}