IOS UI学习 UISearchController

使用UISearchController 配合UITableView实现搜索功能

  1 #import "ViewController12.h"
  2
  3 @interface ViewController12 () <UITableViewDataSource , UITableViewDelegate , UISearchResultsUpdating>
  4
  5 @end
  6
  7 @implementation ViewController12
  8 {
  9     UISearchController * _searchC;//SearchController
 10     UITableView *_tableV; //tableView
 11     NSMutableArray * _selectArr;//存放搜索结果数组
 12     NSMutableArray *_dataArr;//存放所有数据的数组
 13 }
 14 - (void)viewDidLoad
 15 {
 16     [super viewDidLoad];
 17     self.view.backgroundColor = [UIColor whiteColor];
 18     //是否根据按所在界面的navigationbar与tabbar的高度，自动调整scrollview的 inset,设置为no，让它不要自动调整就
 19     self.automaticallyAdjustsScrollViewInsets = NO;
 20     [self createData];
 21     [self createTableView];
 22     _selectArr = [[NSMutableArray alloc] init];
 23 }
 24
 25
 26 #pragma mark 创建数据
 27 -(void)createData
 28 {
 29     if (!_dataArr)
 30     {
 31         _dataArr = [[NSMutableArray alloc] init];
 32     }
 33
 34     for (NSInteger i = 0; i<100; i++)
 35     {
 36         [_dataArr addObject:[NSString stringWithFormat:@"%ld",i]];
 37     }
 38     NSLog(@"%@",_dataArr);
 39 }
 40
 41 #pragma mark 创建 TableView  UISearchController
 42 -(void)createTableView
 43 {
 44     _tableV = [[UITableView alloc] initWithFrame:CGRectMake(0, 64, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-64-54)];
 45
 46     _tableV.delegate = self;
 47     _tableV.dataSource = self;
 48     _searchC = [[UISearchController alloc] initWithSearchResultsController:nil];
 49
 50
 51     _searchC.hidesNavigationBarDuringPresentation = NO;
 52     _searchC.dimsBackgroundDuringPresentation = YES;
 53     //设置代理
 54     _searchC.searchResultsUpdater = self;
 55     //调整SearchBar尺寸为自适应
 56     [_searchC.searchBar sizeToFit];
 57     //把SearchBar 给 TableView的标头
 58     _tableV.tableHeaderView = _searchC.searchBar;
 59     [self.view addSubview:_tableV];
 60
 61 }
 62
 63
 64
 65
 66 -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 67 {
 68     return 1;
 69 }
 70 -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 71 {
 72     //通过active属性判断是否搜索
 73     if (_searchC.active)
 74     {
 75         return _selectArr.count;
 76     }
 77     else
 78         return _dataArr.count;
 79 }
 80
 81 //设置单元格 cell
 82 -(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 83 {
 84     static NSString * str = @"cell";
 85     UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:str];
 86     if (!cell)
 87     {
 88         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:str];
 89     }
 90
 91     if (_searchC.active)
 92     {
 93         cell.textLabel.text = _selectArr[indexPath.row];
 94     }
 95     else
 96     {
 97         cell.textLabel.text = _dataArr[indexPath.row];
 98     }
 99     return cell;
100 }
101
102
103
104
105
106 //执行搜索
107 -(void)updateSearchResultsForSearchController:(UISearchController *)searchController
108 {
109     NSString *searchString = [_searchC.searchBar text];
110     NSPredicate *preicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchString];
111     if (_selectArr!= nil) {
112         [_selectArr removeAllObjects];
113     }
114     //过滤数据
115     _selectArr= [NSMutableArray arrayWithArray:[_dataArr filteredArrayUsingPredicate:preicate]];
116     //刷新表格
117     [_tableV reloadData];
118 }
119
120
121
122 - (void)didReceiveMemoryWarning {
123     [super didReceiveMemoryWarning];
124     // Dispose of any resources that can be recreated.
125 }
126
127 @end