iOS-UISearchBar和UISearchController(参考网友来练习一下)

#import "ViewController.h"
#import "TestCell.h"
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,UISearchBarDelegate,UISearchResultsUpdating>
{
    NSMutableArray *dataArray;
    NSMutableArray *searchArray;
    UISearchController *mySearchController;
   
}
@property (weak, nonatomic) IBOutlet UITableView *myTableView;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    mySearchController=[[UISearchController alloc]initWithSearchResultsController:nil];
    mySearchController.searchResultsUpdater=self;
    mySearchController.dimsBackgroundDuringPresentation=NO;
    mySearchController.hidesNavigationBarDuringPresentation=NO;
    mySearchController.searchBar.frame=CGRectMake(mySearchController.searchBar.frame.origin.x, mySearchController.searchBar.frame.origin.y, mySearchController.searchBar.frame.size.width, 44.0 );
    self.myTableView.tableHeaderView=mySearchController.searchBar;
    
    dataArray=[NSMutableArray array];
    for(NSInteger i=0;i<100;i++)
    {
        [dataArray addObject:[NSString stringWithFormat:@"%ld-test",(long)i]];
    }
    
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (mySearchController.active)
    {
        return searchArray.count;
    }
    else
    {
        return dataArray.count;
    }

}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 44;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    TestCell *testCell=[tableView dequeueReusableCellWithIdentifier:@"TestCell" forIndexPath:indexPath];
    if (mySearchController.active) {
        testCell.testLabel.text=searchArray[indexPath.row];
    }
    else
    {
        testCell.testLabel.text=dataArray[indexPath.row];
    }
    
    return testCell;
}
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController
{
    NSString *searchString=mySearchController.searchBar.text;
    NSPredicate *predicate=[NSPredicate predicateWithFormat:@"self contains[c]%@",searchString];
    if (searchArray.count)
    {
        [searchArray removeAllObjects];
    }
    searchArray=[NSMutableArray arrayWithArray:[dataArray filteredArrayUsingPredicate:predicate]];
    [_myTableView reloadData];
    
}
@end