谓词

http://blog.csdn.net/lmf208/article/details/38345321

http://blog.csdn.net/jiangwei0910410003/article/details/41923507

如果是两个 存储自定义  对象的数组  直接 进行过滤 。。 

#import <Foundation/Foundation.h>

@interface person : NSObject

@property (nonatomic,strong) NSString *num;

@property (nonatomic,strong) NSString *name;

+ (instancetype)personWithNum:(NSString *)num name:(NSString *)name;

@end

初始化 自己自定义的实力  ， 并放在不同的两个数组中

 person *a1 = [person personWithNum:@"1" name:@"我0"];

    person *a2 = [person personWithNum:@"2" name:@"我1"];

    person *a3 = [person personWithNum:@"3" name:@"我2"];

    person *a4 = [person personWithNum:@"1" name:@"我0"];

    person *a5 = [person personWithNum:@"5" name:@"我4"];

    person *a6 = [person personWithNum:@"6" name:@"我5"];

    person *a7 = [person personWithNum:@"7" name:@"我6"];

    person *a8 = [person personWithNum:@"8" name:@"我7"];

    

    NSArray *array1 = [NSArray arrayWithObjects:a1,a2,a3,a8, nil];

    NSArray *array2 = [NSArray arrayWithObjects:a3,a4,a5,a6,a7,a1, nil];

    //使用第一个数组  来过滤 第二个数组   SELF.num IN %@.num 判断两个数组中  如果有   对象  num 相同的 就  保存到  result 数组中。

  //  NOT  ( SELF.num IN %@.num)  //就是 对上面的结果 取反 

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.num IN %@.num",array1];

    

    NSArray *result = [array2 filteredArrayUsingPredicate:predicate];

    NSLog(@"%@",result);