iOS 查询数组中的对象

NSArray  *array =@["123", @"234", @"345"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains [cd] %@","2"];
NSArray *filterdArray = [array filterdArrayUsingPredicate:predicate];
NSLog(@"%@", filterdArray );
//output : @"123", "234"

@interface Person: NSObject
{
NSString *_name;
NSString *_telephone;
NSInteger _id;
}
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *telephone;
@property (nonatomic, assign) NSInteger id;
@end

1）.等于查询
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == %@","Ansel"];
NSArray *filteredArray = [array filteredArrayUsingPredicate:predicate];

2）.模糊查询
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name CONTAINS %@", @"A"];//predicate只能是对象
NSArray *filteredArray = [array filteredArrayUsingPredicate:predicate];