UISearchBar和UISearchDisplayController实现搜索栏

要实现tableview的搜索栏，实现方法有两种：第一种是UISearchBar和UIDisplayController结合起来实现，另一种是通过UISearchController实现。这里只介绍第一种：

注意: UISearchBar和UISearchDisplay只推荐iOS8.0之前使用。

关于UISearchController的使用请跳转至： UITableView使用进阶(一):搜索栏

使用的协议

需要使用四个协议，分别是

<UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate, UISearchDisplayDelegate>

头文件 ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (nonatomic, strong) UITableView *mTableView;
//搜索结果
@property (nonatomic, strong) NSArray *filterData;
//全部数据
@property (nonatomic, strong) NSMutableArray *allData;
@property (nonatomic, retain) UISearchDisplayController *searchDisplayController;

@end

实现文件 ViewController.m

#import "ViewController.h"

@interface ViewController () <UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate, UISearchDisplayDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //初始化数据
    int count = 100;
    self.allData = [NSMutableArray arrayWithCapacity:count];
    for (int i = 0; i < count; i ++) {
        [self.allData addObject:[NSString stringWithFormat:@"第%d行", i]];
    }
    
    
    //定义tableview
    CGRect appFrame = [[UIScreen mainScreen] bounds];
    self.mTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 20, appFrame.size.width, appFrame.size.height - 20) style:UITableViewStylePlain];
    self.mTableView.delegate = self;
    self.mTableView.dataSource = self;
    [self.view addSubview:self.mTableView];
    
    //定义UISearchBar
    
    UISearchBar *mySearchBar = [[UISearchBar alloc] init];
    mySearchBar.delegate = self;
    [mySearchBar setAutocapitalizationType:UITextAutocapitalizationTypeNone];
    [mySearchBar sizeToFit];
    self.mTableView.tableHeaderView = mySearchBar;
    
    //定义UISearchDisplayController
    self.searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:mySearchBar contentsController:self];
    self.searchDisplayController.delegate = self;
    [self.searchDisplayController setSearchResultsDataSource:self];
    
    [self setSearchDisplayController:self.searchDisplayController];
    
    
}


#pragma mark - UITableView Delegate
- (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        return [self.filterData count];
    } else {
        return [self.allData count];
    }
}

#pragma mark - UITableView DataSource
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellid = @"cellid";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellid];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellid];
    }
    
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        cell.textLabel.text = [self.filterData objectAtIndex:indexPath.row];
    } else {
        cell.textLabel.text = [self.allData objectAtIndex:indexPath.row];
    }
    
    return cell;
}

#pragma mark - UISearchDisplayController 
- (BOOL) searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[cd] %@", searchString];
    self.filterData = [self.allData filteredArrayUsingPredicate:predicate];
    
    return YES;
}

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

@end

实现效果