iOS tableview实现简单搜索功能
本文实例为大家分享了tableview实现搜索功能的具体代码，供大家参考，具体内容如下
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 = [NSMutableDictionary dictionaryWithCapacity:[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 = [[NSDictionary alloc]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.allWords allKeys]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:searchTerm options: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 =[tableView dequeueReusableCellWithIdentifier:NoteSectionIdentifier];
if(cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier: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
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