谓词的使用 －ios

#import <Foundation/Foundation.h>

@interface Person : NSObject<NSCopying>
@property(nonatomic,copy) NSString *name;
@property(nonatomic,retain) NSNumber *age;
-(void) setNewName:(NSString *) name;
@end

 

#import "Person.h"

@implementation Person:NSObject

- (id)copyWithZone:(NSZone *)zone{
    Person *person=[[[self class] allocWithZone:zone] init];
    person.name=_name;
    person.age=_age;
    return person;
}
-(void) setNewName:(NSString *) name{
    self.name=name;
}
-(NSString *)description{
    NSString *description=[NSString stringWithFormat:@"年龄：%@；名字：%@",_age,_name];
    return description;
}
@end

 

//谓词用法 NSPredicate
        NSMutableArray *array=[NSMutableArray array];
        for (int i=0; i<10; i++) {
            Person *person=[[Person alloc]init];
            [person setAge:@(20+i)];
            person.name=[NSString stringWithFormat:@"jage-%d",i];
            [array addObject:person];
        }
        //大，小，等；等运算过滤
        NSPredicate *predicate=[NSPredicate predicateWithFormat:@"age<%d",25];
        NSPredicate *predicate2=[NSPredicate predicateWithFormat:@"age<23",23];
        NSPredicate *predicate3=[NSPredicate predicateWithFormat:@"age<27 and age>25"];
        NSPredicate *predicate4=[NSPredicate predicateWithFormat:@"age<27 && age>25"];
        NSPredicate *predicate5=[NSPredicate predicateWithFormat:@"age<23 || age>26"];
        NSPredicate *predicate6=[NSPredicate predicateWithFormat:@"name='jage-3'"];
        //在某个里面
        NSPredicate *predicate7=[NSPredicate predicateWithFormat:@"name in {'jage-1','jage-5'}"];
        NSArray *inArray=@[@"jage-1",@"jage-4",@"jage-3"];
        NSPredicate *predicate8=[NSPredicate predicateWithFormat:@"name in %@",inArray];
        //已什么开头，注意加单引号
        NSPredicate *predicate9=[NSPredicate predicateWithFormat:@"name BEGINSWITH 'jage'"];
        //已什么结尾，注意加单引号
        NSPredicate *predicate10=[NSPredicate predicateWithFormat:@"name ENDSWITH '-9'"];
        //包含，注意加单引号
        NSPredicate *predicate11=[NSPredicate predicateWithFormat:@"name CONTAINS '-3'"];
        //like，注意加单引号
        NSPredicate *predicate12=[NSPredicate predicateWithFormat:@"name LIKE 'jage-?'"];
        NSPredicate *predicate13=[NSPredicate predicateWithFormat:@"name LIKE '*-2'"];
        
        for (Person *person in array) {
            if([predicate6 evaluateWithObject:person]){//逐个对象判断
                NSLog(@"%@",person);
            }
        }
        //对数组过滤
       NSArray *filterArray=[array filteredArrayUsingPredicate:predicate13];
        NSLog(@"%@",filterArray);