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  • 关于索引

    //

    //  ViewController.m

    //  Project New

    //

    //  Created by sjq-4-1 on 16/10/8.

    //  Copyright © 2016年 sjq-4-1. All rights reserved.

    //

    //h.文件

    @interface ViewController : UIViewController <UITableViewDataSource,UITableViewDelegate,UISearchBarDelegate,UISearchResultsUpdating>

    #import "ViewController.h"

    #import "ToDoItem.h"

    #import "AddItemViewController.h"

    #import "CustomTableViewCell.h"

    @interface ViewController ()

    @property (strong,nonatomic) NSMutableArray *toDoList;

    @property (weak, nonatomic) IBOutlet UITableView *tableview;

    @property (nonatomic,strong) UISearchController *searchController;

    @property (strong,nonatomic) NSMutableArray *searchResult;

    //建立索引数组

    @property (strong,nonatomic) NSMutableArray *dataSource,*dataBase;

    @end

    @implementation ViewController

    - (void)viewDidLoad {

        [super viewDidLoad];

        // Do any additional setup after loading the view, typically from a nib.

        

        _searchController = [[UISearchController alloc] initWithSearchResultsController:nil];

        _searchController.searchResultsUpdater = self;

        _searchController.dimsBackgroundDuringPresentation = NO;

        _searchController.hidesNavigationBarDuringPresentation = NO;

        _searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0);

        self.tableview.tableHeaderView = self.searchController.searchBar;

        

        

        

       

        

        

        

        

        

        [self initialList];

    }

    - (void)initialList {

        self.toDoList = [NSMutableArray array];

        

        ToDoItem *tempItem = nil;

        

        for (int i='A'; i<='Z'; i++) {

            tempItem = [ToDoItem new];

            NSString *tempName = [NSString stringWithFormat:@"%c 项目",i];

            tempItem.itemName = tempName;

            

            [self.toDoList addObject:tempItem];

        }

        

        

        

        

    }

    - (void)didReceiveMemoryWarning {

        [super didReceiveMemoryWarning];

        // Dispose of any resources that can be recreated.

    }

    //接受来自添加页面获得 的新信息

    -(IBAction)unwindToList:(UIStoryboardSegue *)segue {

        AddItemViewController *addVC = segue.sourceViewController;

        

        ToDoItem *item = addVC.toDoItem;

        if (item != nil) {

            [self.toDoList addObject:item];

        }

        

        //刷新页面

        [self.tableview reloadData];

        

    }

    //两个协议的必须实现的方法

    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

        

        if (self.searchController.active) {

            return self.searchResult.count;

        }else{

            return self.toDoList.count;

        }

        

        

        

    }

    // Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:

    // Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

        

        NSString *reuseIdentifier= @"reuseIdentifier";

        CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier];

        

        if (cell == nil) {

            cell = [[CustomTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier];

        }

        

        ToDoItem *item =nil;

        if (self.searchController.active) {

            item = [self.searchResult objectAtIndex:indexPath.row];

        }else{

            item = [self.toDoList objectAtIndex:indexPath.row];

        }

        

        

        

        

        

        //    cell.textLabel.text = item.itemName;

        

        UIImage *image1 = [UIImage imageNamed:@"zj.jpg"];

        

        CGSize size = cell.UIImageview.frame.size;

        

        cell.UIImageview.image = [self OriginImage:image1 scaleToSize:size];

        

        //    cell.imageView.contentMode = UIViewContentModeScaleAspectFill;

        cell.UIName.text = item.itemName;

        cell.UIStateTime.text = @"0.5  小时";

        

        

        return cell;

        

    }

    -(UIImage *)OriginImage:(UIImage *)image scaleToSize:(CGSize)size{

        

        UIGraphicsBeginImageContext(size);

        

        [image drawInRect:CGRectMake(0, 0, size.width, size.height)];

        

        UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();

        

        UIGraphicsEndImageContext();

        

        return scaledImage;

    }

    //搜索需实现函数

    - (void) updateSearchResultsForSearchController:(UISearchController *)searchController{

        

        NSString *searchString = [self.searchController.searchBar text];

        NSPredicate *preicate = [NSPredicate predicateWithFormat:@"itemName contains[c] %@",searchString];

        if (self.searchResult!=nil) {

            [self.searchResult removeAllObjects];

        }

        // 过滤数据

        self.searchResult = [NSMutableArray arrayWithArray:[_toDoList filteredArrayUsingPredicate:preicate]];

        //刷新数据

        [self.tableview reloadData];

        

        

    }

    #pragma mark - Table view delegate

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

    {

        

    }

    @end

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  • 原文地址:https://www.cnblogs.com/qiyiyifan/p/5946061.html
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