iOS tableview 实现简单的搜索功能

转自：http://blog.csdn.net/itpeng523/article/details/23035679

一、先用xcode创建好工程



通过xib文件来初始化视图控制器



二、编写代码

1、先为NSDictionary创建一个分类 实现字典的深拷贝

.h文件

#import <Foundation/Foundation.h>

@interface NSDictionary (MutableDeepCopy)

- (NSMutableDictionary *)mutableDeepCopy;

@end

.m文件

#import "NSDictionary+MutableDeepCopy.h"

@implementation NSDictionary (MutableDeepCopy)

- (NSMutableDictionary *)mutableDeepCopy

{

NSMutableDictionary *mutableDictionary = [NSMutableDictionarydictionaryWithCapacity:[self count]]; //这里的容量也只是个参考值,表示对大小的限制 大小是调用该方法的count

NSArray *keys = [self allKeys]; //self就是个可变的字典

for(id key in keys)

{

id dicValue = [self valueForKey:key]; //从 NSDictionary 取值的时候有两个方法objectForkey
valueForKey

id dicCopy = nil;

if([dicValue respondsToSelector:@selector(mutableDeepCopy)]) //如果对象没有响应mutabledeepcopy 就创建一个可变副本 dicValue 有没有实现这个方法

{

dicCopy = [dicValue mutableDeepCopy];

}

else if([dicValue respondsToSelector:@selector(mutableCopy)])

{

dicCopy = [dicValue mutableCopy];

}

if(dicCopy ==nil)

{

dicCopy = [dicValue copy];

}

[mutableDictionary setValue:dicCopy forKey:key];

}

return mutableDictionary;

}

@end

2、编写主代码

.h文件

NoteScanViewController.h

#import <UIKit/UIKit.h>

@interface NoteScanViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,UISearchBarDelegate>

@property (nonatomic,retain)NSMutableDictionary *words;

@property (nonatomic,retain)NSMutableArray *keys;

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

@property (weak, nonatomic) IBOutlet UISearchBar *search;

@property (nonatomic,retain)NSDictionary *allWords;

- (void)resetSearch;

- (void)handleSearchForTerm:(NSString *)searchTerm;

@end

.m文件

#import "NoteScanViewController.h"

#import "NSDictionary+MutableDeepCopy.h"

@interface NoteScanViewController ()

@end

@implementation NoteScanViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle*)nibBundleOrNil

{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

// Custom initialization

}

return self;

}

- (void)viewDidLoad //只在第一次加载视图调用

{

[super viewDidLoad];

/*加载plist文件*/

NSString *wordsPath = [[NSBundle mainBundle]pathForResource:@"NoteSection"ofType:@"plist"];//得到属性列表的路径

NSDictionary *dictionary = [[NSDictionaryalloc]initWithContentsOfFile:wordsPath];

self.allWords = dictionary;

[self resetSearch]; //加载并填充words可变字典和keys数组

_search.autocapitalizationType = UITextAutocapitalizationTypeNone;//不自动大写

_search.autocorrectionType = UITextAutocorrectionTypeNo;//不自动纠错

}

//取消搜索或者改变搜索条件

- (void)resetSearch

{

self.words = [self.allWords mutableDeepCopy]; //得到所有字典的副本 得到一个字典

NSLog(@"所有字典 = %@",self.words);

NSMutableArray *keyArray = [[NSMutableArray alloc]init];//创建一个可变数组

[keyArray addObjectsFromArray:[[self.allWordsallKeys]sortedArrayUsingSelector:@selector(compare:)]]; //用指定的selector对array的元素进行排序

self.keys = keyArray; //将所有key 存到一个数组里面

NSLog(@"所有key = %@",self.keys);

}

//实现搜索方法

- (void)handleSearchForTerm:(NSString *)searchTerm

{

NSMutableArray *sectionsRemove = [[NSMutableArray alloc]init]; //创建一个数组存放我们所找到的空分区

[self resetSearch];

for(NSString *key in self.keys)//遍历所有的key

{

NSMutableArray *array = [_words valueForKey:key] ; //得到当前键key的名称 数组

NSMutableArray *toRemove = [[NSMutableArray alloc]init];//需要从words中删除的值 数组

for(NSString *word in array) //实现搜索

{

if([word rangeOfString:searchTermoptions:NSCaseInsensitiveSearch].location == NSNotFound)//搜索时忽略大小写 把没有搜到的值 放到要删除的对象数组中去

[toRemove addObject:word]; //把没有搜到的内容放到 toRemove中去

}

if([array count] == [toRemove count])//校对要删除的名称数组长度和名称数组长度是否相等

[sectionsRemove addObject:key]; //相等 则整个分区组为空

[array removeObjectsInArray:toRemove]; //否则 删除数组中所有与数组toRemove包含相同的元素

}

[self.keys removeObjectsInArray:sectionsRemove];// 删除整个key 也就是删除空分区，释放用来存储分区的数组，并重新加载table 这样就实现了搜索

[_table reloadData];

}

- (void)viewWillAppear:(BOOL)animated //当使用Push或者prenset方式调用

{

}

//#pragma mark -

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

return ([_keys count]
>0)?[_keys count]:1; //搜索时可能会删除所有分区 则要保证要有一个分区

}

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

{

if([_keys count] == 0)

{

return 0;

}

NSString *key = [_keys objectAtIndex:section]; //得到第几组的key

NSArray *wordSection = [_words objectForKey:key]; //得到这个key里面所有的元素

return [wordSection count]; //返回元素的个数

}

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

{

NSUInteger section = [indexPath section]; //得到第几组

NSUInteger row = [indexPath row]; //得到第几行

NSString *key = [_keys objectAtIndex:section]; //得到第几组的key

NSArray *wordSection = [_words objectForKey:key]; //得到这个key里面的所有元素

static NSString *NoteSectionIdentifier = @"NoteSectionIdentifier";

UITableViewCell *cell =[tableViewdequeueReusableCellWithIdentifier:NoteSectionIdentifier];

if(cell == nil)

{

cell = [[UITableViewCellalloc]initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:NoteSectionIdentifier];

}

cell.textLabel.text = [wordSection objectAtIndex:row];

return cell;

}

//为每个分区指定一个标题

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

if([_keys count] == 0)

return @" ";

NSString *key = [_keys objectAtIndex:section];

return key;

}

//创建一个索引表

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView

{

return _keys;

}

#pragma mark -

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

[_search resignFirstResponder]; //点击任意 cell都会取消键盘

return indexPath;

}

#pragma mark-

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar //搜索button点击事件

{

NSString *searchTerm = [searchBar text];

[self handleSearchForTerm:searchTerm]; //搜索内容 删除words里面的空分区和不匹配内容

}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString*)searchText

{ //搜索内容随着输入及时地显示出来

if([searchText length] == 0)

{

[self resetSearch];

[_table reloadData];

return;

}

else

[self handleSearchForTerm:searchText];

}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar //点击取消按钮

{

_search.text = @""; //标题 为空

[self resetSearch]; //重新 加载分类数据

[_table reloadData];

[searchBar resignFirstResponder]; //退出键盘

}

@end

运行结果