带有 NSPredicate 的搜索栏不起作用 [英] Search bar with NSPredicate doesn't work
问题描述
我使用搜索栏创建了用于编辑朋友的视图.我添加/删除朋友工作正常，但我在使用搜索栏添加/删除朋友时遇到问题...我的搜索栏很好地找到了我正在点击的电子邮件，但顺序发生了变化:如果我通过搜索栏找到 2 封电子邮件，这 2 封电子邮件将是我的财产Allfriend"中的第 2 封电子邮件，而不是我使用搜索栏找到的电子邮件...在 NSLog 之后 didSelectRowAtIndexPath 中是否有任何代码需要完成?
I've made a view for editing friend, with a searchbar. My adding/deleting friends is working fine, but I've a problem with my adding/deleting friends WITH SEARCHBAR... My searchbar finds well the email I'm tapping, but the order change : if I find 2 email with my searchbar, the 2 email will are the 2 first email in my property "Allfriend", and not the email I found with searchbar... Is there any code to complete in didSelectRowAtIndexPath after NSLog ?
我让你看看我的代码，如果你看到问题告诉我:
I let you see my code, tell me if you see a problem :
editfriend.h :
editfriend.h :
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
@interface EditFriendsViewController : UITableViewController <UISearchBarDelegate, UISearchDisplayDelegate>
@property (nonatomic, strong) NSArray *allUsers;
@property (nonatomic, strong) PFUser *currentUser;
@property (nonatomic, strong) NSMutableArray *friends;
@property (strong, nonatomic) NSArray *searchResults;
@property (nonatomic, strong) PFUser *user;
@property (nonatomic, strong) NSMutableArray *filteredArray;
@property (nonatomic, strong) UIImage *MindleNav;
-(BOOL)isFriend:(PFUser*)user;
@end
editfriend.m :
editfriend.m :
#import "EditFriendsViewController.h"
@interface EditFriendsViewController ()
@end
@implementation EditFriendsViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.titleView = [[UIImageView alloc] initWithImage:self.MindleNav];
self.searchResults = [[NSArray alloc] init];
PFQuery *query = [PFUser query];
[query orderByAscending:@"email"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (error) {
NSLog(@"Error: %@ %@", error, [error userInfo]);
}
else {
self.allUsers = objects;
// self.user = [objects objectAtIndex:0];
[self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];
}
}];
self.currentUser = [PFUser currentUser];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
if (tableView == self.searchDisplayController.searchResultsTableView)
{
return [self.searchResults count];
}
else
{
return [self.allUsers count];
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
PFUser *user = [self.allUsers objectAtIndex:indexPath.row];
if (tableView == self.searchDisplayController.searchResultsTableView) {
cell.textLabel.text = [[self.searchResults objectAtIndex:indexPath.row] email];
} else {
cell.textLabel.text = user.email;
}
if ([self isFriend:user]) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else {
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tableView deselectRowAtIndexPath:indexPath animated:NO];
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
PFRelation *friendsRelation = [self.currentUser relationforKey:@"friendsRelation"];
PFUser *user = [self.allUsers objectAtIndex:indexPath.row];
if (tableView == self.searchDisplayController.searchResultsTableView) {
NSLog(@"CLICK search");
cell.accessoryType = UITableViewCellAccessoryNone;
} else {
NSLog(@"CLICK");
}
if ([self isFriend:user]) {
cell.accessoryType = UITableViewCellAccessoryNone;
for(PFUser *friend in self.friends) {
if ([friend.objectId isEqualToString:user.objectId]) {
[self.friends removeObject:friend];
break;
}
}
[friendsRelation removeObject:user];
}
else {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
[self.friends addObject:user];
[friendsRelation addObject:user];
}
[self.currentUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (error) {
NSLog(@"Error: %@ %@", error, [error userInfo]);
}
}];
}
#pragma mark - Helper methods
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"email beginswith[c] %@", searchText];
self.searchResults = [self.allUsers filteredArrayUsingPredicate:predicate];
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self filterContentForSearchText:searchString
scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
objectAtIndex:[self.searchDisplayController.searchBar
selectedScopeButtonIndex]]];
return YES;
}
- (BOOL)isFriend:(PFUser *)user {
for(PFUser *friend in self.friends) {
if ([friend.objectId isEqualToString:user.objectId]) {
return YES;
}
}
return NO;
}
@end
推荐答案
你的数组(可能)包含 PFUser 对象，谓词是:
Your array (probably) contains PFUser objects and the predicate is:
[NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", searchText]
BEGINSWITH 仅适用于字符串，而您尝试将其应用于 PFUser 对象.这是崩溃的一个原因.如果要搜索名称以 searchText 开头的用户，请将谓词更改为:
BEGINSWITH works only for strings and you try to apply it to PFUser objects. This is a reason of the crash. If you want to search for users whose names begin with the searchText, change the predicate to:
[NSPredicate predicateWithFormat:@"username beginswith[c] %@", searchText]
这篇关于带有 NSPredicate 的搜索栏不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
