思路： 把UISearchVC作為tableView的頭視圖错负，只是顯示一個(gè)搜索框甘耿，當(dāng)點(diǎn)擊搜索框時(shí)，可輸入文字進(jìn)行搜索么翰，根據(jù)searchVC的active屬性來在tabelView上顯示數(shù)據(jù)青灼。searchVC的代理方法暴心，當(dāng)搜索框內(nèi)容變化時(shí)會(huì)調(diào)用，可根據(jù)輸入內(nèi)容篩選搜索結(jié)果在tabelView上顯示杂拨。

代理方法：
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController

效果圖：

效果圖.gif

代碼如下：

#import "MainViewController.h"
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height

@interface MainViewController ()<UITableViewDelegate, UITableViewDataSource,UISearchResultsUpdating, UISearchBarDelegate>
@property (nonatomic, strong) NSMutableArray *allData;
@property (nonatomic, strong) NSMutableArray *searchData;
@property (nonatomic, strong) UITableView *myTable;
@property (nonatomic, strong) UISearchController *searchVC;
@end

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.title = @"搜索";
    
    self.allData = [NSMutableArray array];
    self.searchData = [NSMutableArray array];
    
    [self createTableView];
    [self createSearchVC];
    
    for (int i = 0; i < 100; i++) {
        
        [self.allData addObject:[NSString stringWithFormat:@"%d", i]];
    }
    
}

- (void)createTableView{
    self.myTable = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight)];
    self.myTable.dataSource = self;
    self.myTable.delegate = self;
    [self.view addSubview:self.myTable];
}

-(void)createSearchVC{
    self.searchVC = [[UISearchController alloc]initWithSearchResultsController:nil];
    //設(shè)置searchVC的代理
    self.searchVC.searchResultsUpdater = self;
    //點(diǎn)擊搜索時(shí)是否加半透明遮罩視圖
    self.searchVC.dimsBackgroundDuringPresentation = NO;
    self.searchVC.searchBar.delegate = self;
    //點(diǎn)擊搜索框時(shí)是否隱藏原來的導(dǎo)航欄
    self.searchVC.hidesNavigationBarDuringPresentation = YES;
    //設(shè)置搜索框上的文字
    self.searchVC.searchBar.placeholder = @"搜索";
    self.myTable.tableHeaderView = self.searchVC.searchBar;
    
    //下面這兩行是設(shè)置 searchVC上searchBar后面的cancle改為取消
//   [[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitle:@"取消"];
    [UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]].title = @"取消";
    
}

//這個(gè)方法也能設(shè)置搜索框上的cancelBtn系顯示樣式
#pragma mark -UISearchBarDelegate
//- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar{
//    [searchBar setShowsCancelButton:YES animated:YES];
////    searchBar.showsCancelButton = YES;
//    for (id view in [[searchBar.subviews objectAtIndex:0] subviews]) {
//        if ([view isKindOfClass:[UIButton class]]) {
//
//            UIButton *btn = (UIButton *)view;
//            [btn setTitle:@"取消" forState:UIControlStateNormal];
//            break;
//        }
//    }
//}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}

//設(shè)置區(qū)域的行數(shù)
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    
    if (self.searchVC.active) {
        return [self.searchData count];
    }else{
        return [self.allData count];
    }
}

//返回單元格內(nèi)容
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *flag=@"cellFlag";
    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:flag];
    if (cell==nil) {
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:flag];
    }
    if (self.searchVC.active) {
        [cell.textLabel setText:self.searchData[indexPath.row]];
    }
    else{
        [cell.textLabel setText:self.allData[indexPath.row]];
    }
    //
    return cell;
}

#pragma mark -UISearchResultsUpdating
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{
    
    NSString *searchText = self.searchVC.searchBar.text;
    
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@", searchText];
    if ([self.searchData count] != 0) {
        [self.searchData removeAllObjects];
    }
    
    // 直接用賦值的方法专普，可變數(shù)組會(huì)變成不可變 這樣強(qiáng)轉(zhuǎn)searchData仍是不可變數(shù)組，再去調(diào)removeAllObjects會(huì)崩潰
//    self.searchData = (NSMutableArray *)[self.allData filteredArrayUsingPredicate:predicate];
//    錯(cuò)誤提示： [__NSArrayI removeAllObjects]: unrecognized selector sent to instance
    
    //以下三種方法是可以的
    [self.searchData addObjectsFromArray:[self.allData filteredArrayUsingPredicate:predicate]];
    
//    self.searchData = [[self.allData filteredArrayUsingPredicate:predicate] mutableCopy];

//    self.searchData = [NSMutableArray arrayWithArray:[self.allData filteredArrayUsingPredicate:predicate]];
    
    [self.myTable reloadData];
}

@end