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