系統(tǒng)提供了NSPredicate這個(gè)類給我們進(jìn)行一些匹配切油、篩選操作蝙斜，非常方便。在沒有用這個(gè)類時(shí)澎胡，我們要獲取兩個(gè)數(shù)組中某些特定的元素時(shí)孕荠，需要寫代碼一一對(duì)比，但是使用了這個(gè)類攻谁，只需要三四行代碼就夠了稚伍。
先演示一個(gè)謂詞在在類中使用
KKMonthModel.h文件

@interface KKMonthModel : KKBaseModel
/**年份*/
@property(nonatomic,copy)NSString *date_year;
/**月份*/
@property(nonatomic,copy)NSString *date_month;
/**日*/
@property(nonatomic,copy)NSString *date_day;
/**預(yù)約數(shù)量*/
@property(nonatomic,copy)NSString *appoint_num;
/**上門數(shù)量*/
@property(nonatomic,copy)NSString *receive_num;
@end

KKMonthModle.m文件（取開發(fā)中的部分代碼示例）

if (models.count>0) {
        for (KKMonthModel *monthModel in models) {
            NSPredicate *pre=[NSPredicate predicateWithFormat:@"year==%ld&& month==%ld&& day==%ld",monthModel.date_year.integerValue,monthModel.date_month.integerValue,monthModel.date_day.integerValue];
            NSArray *preArray=[headerModel.calendarItemArray filteredArrayUsingPredicate:pre];
            if (preArray.count>0) {
                KKCalendarModel *model=[preArray lastObject];
                model.monthModel=monthModel;
            }
        }

謂詞主要實(shí)現(xiàn)對(duì)數(shù)組的篩選，數(shù)組里面可是字典巢株，當(dāng)然也可以是數(shù)組槐瑞。下面讓我給大家講講謂詞中常見的使用方法和場(chǎng)景

謂詞的使用使用方法

（1）比較運(yùn)算符

/**比較運(yùn)算符 
         * >:大于 
         * <:小于 
         * >=:大于等于 
         * <=:小于等于 
         * =,==:等于 
         * !=,<>:不等于 
         * BEGINSWITH：檢查某個(gè)字符串是否以指定的字符串開頭（如判斷字符串是否以a開頭：BEGINSWITH 'a'）
         * ENDSWITH：檢查某個(gè)字符串是否以指定的字符串結(jié)尾
         * CONTAINS：檢查某個(gè)字符串是否包含指定的字符串
         * LIKE：檢查某個(gè)字符串是否匹配指定的字符串模板熙涤。其之后可以跟?代表一個(gè)字符和*代表任意多個(gè)字符兩個(gè)通配符阁苞。比如"name LIKE '*ac*'"困檩，這表示name的值中包含ac則返回YES；"name LIKE '?ac*'"那槽，表示name的第2悼沿、3個(gè)字符為ac時(shí)返回YES。
         *MATCHES：檢查某個(gè)字符串是否匹配指定的正則表達(dá)式骚灸。雖然正則表達(dá)式的執(zhí)行效率是最低的糟趾，但其功能是最強(qiáng)大的，也是我們最常用的甚牲。
        // 例子：年齡屬性大于3歲,注意：鍵路徑不能用單引號(hào)引起來(lái)义郑，否則會(huì)報(bào)錯(cuò) 
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"age > 3"]; 

(2)邏輯運(yùn)算符

/**邏輯運(yùn)算符 
 * and/&&:與 
 * or/||:或 
 * not/!:非 
 **/  
// 例子：年齡大于三歲或名字叫“zhang1”的，注意：字符串的值需要用單引號(hào)引起來(lái)丈钙，否則會(huì)報(bào)錯(cuò)非驮，錯(cuò)誤信息是：this class is not key value coding-compliant for the key zhang1.  
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"age > 3 || name = 'zhang1'"];  

(3)關(guān)系運(yùn)算符

/**關(guān)系操作 
         *  ANY，SOME：指定下列表達(dá)式中的任意元素雏赦。比如劫笙，ANY children.age < 18。 
         *  ALL：指定下列表達(dá)式中的所有元素星岗。比如填大，ALL children.age < 18。 
         *  NONE：指定下列表達(dá)式中沒有的元素俏橘。比如允华，NONE children.age < 18。它在邏輯上等于NOT (ANY ...)寥掐。 
         *  IN：等于SQL的IN操作例获，左邊的表達(dá)必須出現(xiàn)在右邊指定的集合中。比如曹仗，name IN { 'Ben', 'Melissa', 'Nick' }榨汤。 
         **/  
        // 例子：in關(guān)鍵字：左邊的關(guān)鍵字里必須包含右邊的集合的元素  
         NSPredicate *predicate = [NSPredicate predicateWithFormat:@" name in {'zhang1','zhang4'}"];  

謂詞的使用場(chǎng)景

（1）謂詞對(duì)對(duì)象數(shù)組的操作

#import <Foundation/Foundation.h>

@interface Products : NSObject
@property NSString *productName;
@property NSInteger productCount;
@property NSString *productImageUrl;
+(id)initProductWithName:(NSString *) name withCount:(NSInteger) count withImage:(NSString *) imageurl;
@end

.m文件中的使用
#import "ViewController.h"
#import "Products.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self mainTest];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

-(void) mainTest
{
    Products *p1=[Products initProductWithName:@"A蘋果sdasf" withCount:2 withImage:@"464.jpg"];
    Products *p2=[Products initProductWithName:@"fsdf橘子gag" withCount:53 withImage:@"fsdfas.jpg"];
    Products *p3=[Products initProductWithName:@"dfgdf香蕉" withCount:5 withImage:@"sfas.jpg"];
    Products *p4=[Products initProductWithName:@"三星" withCount:76 withImage:@"ggas.jpg"];
    Products *p5=[Products initProductWithName:@"華為dfsd" withCount:9 withImage:@"gasa.jpg"];
    Products *p6=[Products initProductWithName:@"微軟dhnnne" withCount:6 withImage:@"hshhh.jpg"];
    Products *p7=[Products initProductWithName:@"三星" withCount:6 withImage:@"hshhh.jpg"];
    Products *p8=[Products initProductWithName:@"15300250500" withCount:6 withImage:@"hshhh.jpg"];

    NSArray *sproducts=[NSArray arrayWithObjects:p1,p2,p3,p4,p5,p6,p7,nil];
    
    //數(shù)量小于9  定義謂詞 包含過(guò)濾條件
    NSPredicate *prdicate=[NSPredicate predicateWithFormat:@"productCount<%d",9];
    //過(guò)濾結(jié)果返回新的數(shù)組
    NSArray *newArray=[sproducts filteredArrayUsingPredicate:prdicate];
    for (Products *item in newArray) {
         NSLog(@"newArray=%@",item.productName);
    }
   
    
    //數(shù)量大于9 并且productname等于“三星jfggg” 定義謂詞 包含過(guò)濾條件
     prdicate=[NSPredicate predicateWithFormat:@"productName='三星' && productCount>9"];
    //過(guò)濾結(jié)果返回新的數(shù)組
     newArray=[sproducts filteredArrayUsingPredicate:prdicate];
    for (Products *item in newArray) {
        NSLog(@"newArray=%@",item.productName);
    }

    //in(包含) *注意 包含是全字匹配
    prdicate = [NSPredicate predicateWithFormat:@"productName IN {'g','華為','三星'}||productCount IN {2,5}"];
    //過(guò)濾結(jié)果返回新的數(shù)組
    newArray=[sproducts filteredArrayUsingPredicate:prdicate];
    for (Products *item in newArray) {
        NSLog(@"newArray=%@",item.productName);
    }

    
    //productName以a開頭的
    prdicate = [NSPredicate predicateWithFormat:@"productName BEGINSWITH 'A'"];
    //productName以ba結(jié)尾的
    prdicate = [NSPredicate predicateWithFormat:@"productName ENDSWITH 'g'"];
    
    //name中包含字符a的
    prdicate = [NSPredicate predicateWithFormat:@"productName CONTAINS 'a'"];
    
    //like 匹配任意多個(gè)字符
    //productName中只要有s字符就滿足條件
    prdicate = [NSPredicate predicateWithFormat:@"productName like '*s*'"];
    //?代表一個(gè)字符，下面的查詢條件是：name中第二個(gè)字符是s的
    prdicate = [NSPredicate predicateWithFormat:@"productName like '?s*'"];
    
    newArray=[sproducts filteredArrayUsingPredicate:prdicate];
    for (Products *item in newArray) {
        NSLog(@"newArray=%@",item.productName);
    }
    
    //正則表達(dá)式 驗(yàn)證是否是手機(jī)號(hào)
    BOOL isMobileNum=[self isMobileNumber:p8.productName];
    if(isMobileNum)
        NSLog(@"是真確的手機(jī)號(hào)：%@",p8.productName);
    
}


- (BOOL)isMobileNumber:(NSString *)mobileNum
{
    /**
     * 手機(jī)號(hào)碼
     * 移動(dòng)：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
     * 聯(lián)通：130,131,132,152,155,156,185,186
     * 電信：133,1349,153,180,189
     */
    NSString * MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";
    /**
     10         * 中國(guó)移動(dòng)：China Mobile
     11         * 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
     12         */
    NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";
    /**
     15         * 中國(guó)聯(lián)通：China Unicom
     16         * 130,131,132,152,155,156,185,186
     17         */
    NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";
    /**
     20         * 中國(guó)電信：China Telecom
     21         * 133,1349,153,180,189
     22         */
    NSString * CT = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";
    /**
     25         * 大陸地區(qū)固話及小靈通
     26         * 區(qū)號(hào)：010,020,021,022,023,024,025,027,028,029
     27         * 號(hào)碼：七位或八位
     28         */
    // NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";
    
    NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
    NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
    NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
    NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
    
    if (([regextestmobile evaluateWithObject:mobileNum] == YES)
        || ([regextestcm evaluateWithObject:mobileNum] == YES)
        || ([regextestct evaluateWithObject:mobileNum] == YES)
        || ([regextestcu evaluateWithObject:mobileNum] == YES))
    {
        if([regextestcm evaluateWithObject:mobileNum] == YES) {
            NSLog(@"中國(guó)移動(dòng)");
        } else if([regextestct evaluateWithObject:mobileNum] == YES) {
            NSLog(@"聯(lián)通");
        } else if ([regextestcu evaluateWithObject:mobileNum] == YES) {
            NSLog(@"電信");
        } else {
            NSLog(@"Unknow");
        }
        
        return YES;
    }
    else
    {
        return NO;
    }
}
@end

(2)謂詞對(duì)字典數(shù)組的操作

dataArray = [[NSMutableArray alloc] init];
    
    NSDictionary * dataDic1 = @{@"image":[UIImage imageNamed:@"photo1.jpg"], @"content":@"I am a boy",@"publisher":@"趣玩高球", @"privateNum":@"122",@"lookNum":@"56"};
    NSDictionary * dataDic2 = @{@"image":[UIImage imageNamed:@"photo2.jpg"], @"content":@"昨天中午有個(gè)男同事外出怎茫，沒把手機(jī)帶走收壕。他老婆不停地打電話來(lái)。午睡的女同事被吵煩了轨蛤，拿過(guò)手機(jī)大吼:我們?cè)谒X,你煩不煩蜜宪！結(jié)果，那位男同事今天到現(xiàn)在都沒來(lái)上班祥山！",@"publisher":@"趣玩高球", @"privateNum":@"122",@"lookNum":@"56"};
    NSDictionary * dataDic3 = @{@"image":[UIImage imageNamed:@"photo3.jpg"], @"content":@"yesterday,my mom buy a apple圃验！",@"publisher":@"趣玩高球", @"privateNum":@"122",@"lookNum":@"56"};
    NSDictionary * dataDic4 = @{@"image":[UIImage imageNamed:@"photo4.jpg"], @"content":@"昨天中午有個(gè)男同事外出，沒把手機(jī)帶走缝呕。他老婆不停地打電話來(lái)澳窑。午睡的女同事被吵煩了斧散，拿過(guò)手機(jī)大吼:我們?cè)谒X,你煩不煩！結(jié)果摊聋，那位男同事今天到現(xiàn)在都沒來(lái)上班鸡捐！",@"publisher":@"趣玩高球", @"privateNum":@"122",@"lookNum":@"56"};
    
    [dataArray addObject:dataDic1];
    [dataArray addObject:dataDic2];
    [dataArray addObject:dataDic3];
    [dataArray addObject:dataDic4];


這里是過(guò)濾KEY為@“content”的值為輸入框的值來(lái)搜索包含有這個(gè)輸入框輸入的文字的字典。

   NSString * searchString = [lifeSearchController.searchBar text];
    
    NSPredicate * predicate = [NSPredicate predicateWithFormat:@"%K CONTAINS[c] %@",@"content",searchString];

    if (searchListArray != nil) {
        [searchListArray removeAllObjects];
    }
    //過(guò)濾數(shù)據(jù)
    searchListArray = [NSMutableArray arrayWithArray:[dataArray filteredArrayUsingPredicate:predicate]];
    NSLog(@"return****** %@",searchListArray);
    //刷新表格
    
    [headTableView reloadData];