NSPredicate issue with NSObjects IOS - ios

Question

I have an NSObject:
#interface ContactAlphaB : NSObject
+ (ContactAlphaB *)contactWithFirstName:(NSString *)firstName lastName:(NSString *)lastName username:(NSString *)username
linkAvatar:(NSString *)linkAvatar registerType:(NSString *)registerType
email:(NSString *)email mobile:(NSString *)mobile;
#end
I had save all informations in this object.
#property (nonatomic) NSString *firstName;
#property (nonatomic) NSString *lastName;
#property (nonatomic) NSString *username;
#property (nonatomic) NSString *linkAvatar;
#property (nonatomic) NSString *registerType;
#property (nonatomic) NSString *stremail;
#property (nonatomic) NSString *strmobile;
And I had show in tableView
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return self.sectionIndexTitles;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [self.sectionIndexTitles count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSString *sectionIndexTitle = self.sectionIndexTitles[section];
return [self.alphabetizedDictionary[sectionIndexTitle] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
CellListsFriend *cell = [tableView dequeueReusableCellWithIdentifier:#"cellListsFriend" forIndexPath:indexPath];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
ContactAlphaB *contact = [self objectAtIndexPath:indexPath];
cell.lblNameFriend.text = contact.fullName;
// Rounded Rect for cell image
cell.imgAvatarFriends.layer.borderWidth=2;
cell.imgAvatarFriends.layer.borderColor=[[UIColor whiteColor]CGColor];
[cell.imgAvatarFriends.layer setCornerRadius:cell.imgAvatarFriends.frame.size.width/2];
[cell.imgAvatarFriends.layer setMasksToBounds:YES];
return cell;
}
- (void)setContacts:(NSArray *)contacts {
self.alphabetizedDictionary = [CGLAlphabetizer alphabetizedDictionaryFromObjects:contacts usingKeyPath:#"lastName"];
self.sectionIndexTitles = [CGLAlphabetizer indexTitlesFromAlphabetizedDictionary:self.alphabetizedDictionary];
[self.tableView reloadData];
}
- (ContactAlphaB *)objectAtIndexPath:(NSIndexPath *)indexPath {
NSString *sectionIndexTitle = self.sectionIndexTitles[indexPath.section];
return self.alphabetizedDictionary[sectionIndexTitle][indexPath.row];
}
With this code, I can show all myfriend lists in tableView.
And now, I want to do search function (search my friend).
So, I'm using NSPredicate *filter = [NSPredicate predicateWithFormat:#"SELF == %#", searchString]; to work this function.
But, I cannot use filteredArrayUsingPredicate in NSObject to search.
How to I can do search function.
Please help me!
*****************Edited:
NSArray *arr = [FriendList MR_findAll];
if (arr.count > 0) {
for (int i = 0; i < arr.count; i++) {
FriendList *friendList = [arr objectAtIndex:i];
[delegate.arrFriendListsAdded addObject:friendList.username];
ContactAlphaB *contact = [ContactAlphaB contactWithFirstName:friendList.firstName
lastName:friendList.lastName
username:friendList.username
linkAvatar:friendList.avatar
registerType:[NSString stringWithFormat:#"%#", friendList.registerType]
email:friendList.email
mobile:friendList.phoneNumber
];
[_mucontacts addObject:contact];
}
}
_mucontacts is NSMutableArray.
When I log this array:
<__NSArrayM 0x4e48050>(
<ContactAlphaB: 0x4f55b90>,
<ContactAlphaB: 0x13e8dc0>,
<ContactAlphaB: 0x4f2bd30>,
<ContactAlphaB: 0x4e6a490>
)
It is save object. When Search, I want to search lastname.
So, When I search lastname it is get empty.

Answer 1

try with this
NSString *searchString = #"your last name here";
NSPredicate *lastname = [NSPredicate predicateWithFormat:#"self.lastname contains[cd] %#", searchString];
NSArray *filteredArray = [mucontacts filteredArrayUsingPredicate:lastname];