谓词 过滤

//
//  main.m
//  谓词
//
//  Created by MAC on 15/12/21.
//  Copyright © 2015年 MAC. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Person.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
       //谓词 NSPredicate
        //对集合进行运算
        //后面是条件
        NSPredicate *pre = [NSPredicate predicateWithFormat:@"age=%d",20];
        //Key %k
        NSPredicate *pre3 = [NSPredicate predicateWithFormat:@"%K=%d",@"age"];
        Person *p1 = [[Person alloc]init];
        p1.pid = 1;
        p1.name =@"tom";
        p1.age = 20;
        Person *p2 = [[Person alloc]init];
        p2.pid = 2;
        p2.name =@"kite";
        p2.age = 20;
        Person *p3 = [[Person alloc]init];
        p3.pid = 3;
        p3.name =@"lll";
        p3.age = 30;
        //判断条件 返回值为Bool
    BOOL b = [pre evaluateWithObject:p2];
        NSLog(@"%@",b==1?@"YES":@"NO");
       //遍历p1 p2 p3 找出年龄等于20的人
        NSArray *array = @[p1,p2,p3];
       // NSPredicate *pre1 = [NSPredicate predicateWithFormat:@"age>%d&&age<%d",20,50];
        //BETWEEN{20，30}在20到30之间
         NSPredicate *pre1 = [NSPredicate predicateWithFormat:@"age BETWEEN {21,50}"];
        for (Person *per in array) {
          BOOL  b = [pre1 evaluateWithObject:per];
            if(b){
                NSLog(@"%@,%d",per.name,per.age);
            }
        }
        //直接过滤数组(重要简单)
        array = [array filteredArrayUsingPredicate:pre1];
        NSLog(@"%@",array);

        //数组的范围过滤年龄
        NSArray *ar = @[[NSNumber numberWithInt:20],[NSNumber numberWithInt:30]];
        NSPredicate *pp = [NSPredicate predicateWithFormat:@"age BETWEEN %@",ar];
        for (Person *per in array) {
            BOOL  b = [pp evaluateWithObject:per];
            if(b){
                NSLog(@"%@,%d",per.name,per.age);
            }
        }

        NSArray *aa = @[@"tom1",@"tom2",@"...tom",@"kite",@"kite1",@"xiao he",];
        //数组里面的本身就是字符串 用SELF （self）
        NSPredicate *predicate  = [NSPredicate predicateWithFormat:@"SELF=%@",@"tom"];
       // aa = [aa filteredArrayUsingPredicate:predicate];
        NSLog(@"%@",aa);
        //找出以特定开始字符串开头的(beginswith)
        NSPredicate *predicate1  = [NSPredicate predicateWithFormat:@"SELF BEGINSWITH %@",@"t"];
       // aa = [aa filteredArrayUsingPredicate:predicate1];
        NSLog(@"..%@",aa);
        //找出以特定结尾字符串结尾的(endswith)
        NSPredicate *predicate2  = [NSPredicate predicateWithFormat:@"SELF ENDSWITH %@",@"he"];
       // aa = [aa filteredArrayUsingPredicate:predicate2];
        NSLog(@"%@",aa);
        //包含特定字符串的contains
        NSPredicate *predicate3  = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@",@"t"];
      //  aa = [aa filteredArrayUsingPredicate:predicate3];
        NSLog(@"%@",aa);

        //开头  ?表示后面可以有单个字符 两个??代表两个字符 *代表若干个
        NSPredicate *predicate4  = [NSPredicate predicateWithFormat:@"SELF LIKE ‘tom*‘"];
         aa = [aa filteredArrayUsingPredicate:predicate4];
        NSLog(@"11%@",aa);

    }
    return 0;
}