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
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#import <foundation/foundation.h> @interface nsdictionary (mutabledeepcopy) - (nsmutabledictionary *)mutabledeepcopy; @end |
.m文件
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#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
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#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
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#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
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/itpeng523/article/details/23035679