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如何使用NSPredicate
来筛选数组ivar对搜索查询的值?我设法对字符串伊娃使用NSPredicate
。我有一个用户定义的类,名为“用户”,用于从AddressBook创建用户。这里是我的代码NSPredicate对抗iphone中的NSArray
// User Defined Class named as "User"
// In User.h
@interface User : NSObject {
NSString *firstName;
NSString *lastName;
NSString *company;
UIImage *userImage;
NSArray *phoneNumberArray;
NSArray *emailArray;
NSArray *urlArray;
NSArray *addressArray;
NSString *notes;
NSString *dateOfBirth;
}
// In SearchViewController.m
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
// contactsArray is NSMutableArray
contactsArray = [Search searchContactsWithQuery:searchText];
NSLog(@"contactsArray count => %d",[contactsArray count]);
[contactsTableView reloadData];
}
// In Search.m
+(NSMutableArray*)searchContactsWithQuery:(NSString*)query {
NSLog(@"Query => %@",query);
NSMutableArray* predicates=[[NSMutableArray alloc] init];
// Create all predicates
NSPredicate * firstNamePredicate = [NSPredicate predicateWithFormat:@"firstName contains %@",query];
[predicates addObject:firstNamePredicate];
NSPredicate * lastNamePredicate = [NSPredicate predicateWithFormat:@"lastName contains %@",query];
[predicates addObject:lastNamePredicate];
NSPredicate * companyPredicate = [NSPredicate predicateWithFormat:@"company contains %@",query];
[predicates addObject:companyPredicate];
// Don't know how to use on array
// === START of ARRAY Predicate ====
NSPredicate *phoneNoPredicate = [NSPredicate predicateWithFormat:@"phoneNumberArray IN %@",query];
[predicates addObject:phoneNoPredicate];
NSPredicate *emailPredicate = [NSPredicate predicateWithFormat:@"emailArray contains %@",query];
[predicates addObject:emailPredicate];
NSPredicate *urlPredicate = [NSPredicate predicateWithFormat:@"urlArray contains %@",query];
[predicates addObject:urlPredicate];
NSPredicate *addressPredicate = [NSPredicate predicateWithFormat:@"addressArray contains %@",query];
// === END of ARRAY Predicate ====
NSPredicate *notesPredicate = [NSPredicate predicateWithFormat:@"notes contains %@",query];
[predicates addObject:notesPredicate];
NSPredicate *dobPredicate = [NSPredicate predicateWithFormat:@"dateOfBirth contains %@",query];
[predicates addObject:dobPredicate];
// Add predicates to array
NSPredicate *compoundPredicate = [NSCompoundPredicate orPredicateWithSubpredicates:predicates];
NSArray * filteredArray = [APP_DELEGATE.allUsersArray filteredArrayUsingPredicate:compoundPredicate];
return [NSMutableArray arrayWithArray:filteredArray];
}
phoneNumberArray,emailArray,urlArray & addressArray的使用,因为用户可能对手机没有,电子邮件,地址,网址像家庭,工作,iPhone,其他等
如何多个条目我可以在数组上使用谓词吗?任何形式的帮助表示赞赏。谢谢
'filteredArrayUsingPredicate:'是正确的路要走。上面的代码无法正常工作吗?你确定数组中有一个与谓词匹配的值吗? – Caleb 2012-03-28 12:30:17
数组中的值与谓词 – iOSAppDev 2012-03-28 12:48:49
相符尝试简化谓词。不要使用复合谓词,而要使用一个简单的谓词来过滤数组。事实上,你可以尝试应用它们以获得9个独立的数组 - 这可能会让你知道问题出在哪里。 – Caleb 2012-03-28 12:57:05