我已经尝试了stackoverflow的所有解决方案。但没有用... 我有一个名为“Notes”的实体。 我需要添加搜索栏来搜索我的表视图中的东西...
@interface ViewController ()
{
NSDateFormatter *formatter;
BOOL isChecked;
NSArray *searchResults;
}
@property (nonatomic, strong) UISearchBar *searchBar;
@property (nonatomic, strong) UISearchDisplayController *searchController;
@property (nonatomic) BOOL *isChecked;
@property (strong) NSMutableArray *notes;
@end
@implementation ViewController
@synthesize tableView;
@synthesize addButton;
@synthesize managedObjectContext;
- (NSManagedObjectContext *)managedObjectContext {
NSManagedObjectContext *context = nil;
id delegate = [[UIApplication sharedApplication] delegate];
if ([delegate performSelector:@selector(managedObjectContext)]) {
context = [delegate managedObjectContext];
}
return context;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = @"My Notes";
tableView.dataSource = self;
tableView.delegate = self;
[self.view addSubview:tableView];
formatter = [[NSDateFormatter alloc] init];
formatter.doesRelativeDateFormatting = YES;
formatter.locale = [NSLocale currentLocale];
formatter.dateStyle = NSDateFormatterShortStyle;
formatter.timeStyle = NSDateFormatterNoStyle;
CATransition *animation = [CATransition animation];
[animation setDuration:2.0];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFromTop];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault]];
[[addButton layer] addAnimation:animation forKey:@"SwitchToDown"];
// place search bar coordinates where the navbar is position - offset by statusbar
self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 20, 320, 44)];
UIBarButtonItem *searchButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(toggleSearch)];
self.navigationItem.rightBarButtonItem = searchButton;
self.searchController = [[UISearchDisplayController alloc] initWithSearchBar:self.searchBar contentsController:self];
self.searchController.searchResultsDataSource = self;
self.searchController.searchResultsDelegate = self;
self.searchController.delegate = self;
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"Notes"];
NSError *error = nil;
self.notes = [[managedObjectContext executeFetchRequest:fetchRequest error:&error] mutableCopy];
NSSortDescriptor *titleSorter= [[NSSortDescriptor alloc] initWithKey:@"mod_time" ascending:NO];
[self.notes sortUsingDescriptors:[NSArray arrayWithObject:titleSorter]];
NSLog(@"Your Error - %@",error.description);
[tableView reloadData];
}
#pragma mark - Search controller
- (void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller
{
}
- (void) searchDisplayControllerWillEndSearch:(UISearchDisplayController *)controller
{
// reposition the table where we want after search has completed
// need to reschedule on runloop to rejig the table layout and correct the
// offset and insets given no search bar will be displayed at the top of the controller
// // as we remove it
// dispatch_async(dispatch_get_main_queue(), ^{
// self.tableView.contentInset = UIEdgeInsetsMake([self.topLayoutGuide length], 0, 0, 0);
// self.tableView.contentOffset = CGPointMake(0, -[self.topLayoutGuide length]);
// });
}
- (void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller
{
// [self.searchBar removeFromSuperview];
}
- (void)toggleSearch{
[self.view addSubview:self.searchBar];
[self.searchController setActive:YES animated:YES];
[self.searchBar becomeFirstResponder];
}
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:@"Notes" inManagedObjectContext:_notes];
[fetchRequest setEntity:entity];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"notes.title contains[c] %@", searchText];
[fetchRequest setPredicate:predicate];
NSError *error;
NSArray* searchResults = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self filterContentForSearchText:searchString
scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
objectAtIndex:[self.searchDisplayController.searchBar
selectedScopeButtonIndex]]];
return YES;
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return searchResults.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (tableView == self.searchDisplayController.searchResultsTableView) {
return [searchResults count];
} else {
return self.notes.count;
}
}
- (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
TableViewCell *cell = (TableViewCell*)[aTableView dequeueReusableCellWithIdentifier:@"MycellIdentifier"];
if(cell == nil)
{
cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"MycellIdentifier"];
}
// Configure the cell...
NSManagedObject *note = [self.notes objectAtIndex:indexPath.row];
NSDate *date = [note valueForKey:@"mod_time"];
NSString *dateString = [formatter stringFromDate:date];
cell.textLabel.text = [note valueForKey:@"title"];
cell.detailTextLabel.text = dateString;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
// cell.accessoryType = UITableViewCellAccessoryCheckmark;
UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(5, 5, 40, 40)];
[button addTarget:self action:@selector(checkBoxClicked:) forControlEvents:UIControlEventTouchUpInside];
[button setImage:[UIImage imageNamed:@"uncheck.png"] forState:UIControlStateNormal];
[cell addSubview:button];
[cell setIndentationLevel:1];
[cell setIndentationWidth:45];
return cell;
}
- (IBAction)addButtonPressed:(id)sender {
AddNoteViewController *addNoteVC = [AddNoteViewController new];
}
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
- (void)tableView:(UITableView *)cTableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
NSManagedObjectContext *context = [self managedObjectContext];
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete object from database
[context deleteObject:[self.notes objectAtIndex:indexPath.row]];
NSError *error = nil;
if (![context save:&error]) {
NSLog(@"Can't Delete! %@ %@", error, [error localizedDescription]);
return;
}
// Remove device from table view
[self.notes removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
}
- (IBAction)btnClick:(id)sender {
}
-(UITableViewCellEditingStyle) tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
return YES;
}
//#pragma Search Methods
//
//- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
//{
// NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", searchText];
// // NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"contains[c] %@", searchText];
// self.searchResults = [self.notes filteredArrayUsingPredicate:predicate];
//}
//
//-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
//{
// [self filterContentForSearchText:searchString
// scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
// objectAtIndex:[self.searchDisplayController.searchBar
// selectedScopeButtonIndex]]];
//
// return YES;
//}
@end
答案 0 :(得分：0)
在头文件
中为nsfetchviewcontroller创建属性#import <UIKit/UIKit.h>
@interface searchController : UIViewController<UITableViewDataSource,UITableViewDelegate,NSFetchedResultsControllerDelegate,UISearchBarDelegate,UISearchResultsUpdating,UISearchControllerDelegate,UITextFieldDelegate,UITextViewDelegate>{}
@property(nonatomic,retain)NSFetchedResultsController *catefetchedResultsController;
@property (nonatomic, retain) IBOutlet TypeTextfiled *searchCate;
@end
将seachCate textfeild与xib文本字段连接，并将委托设置为视图控制器
在您的searchController.m文件中执行此操作 catName，local_Id是我的cordata中的字段，我正在使用它们进行谓词查询，你可以使用自己的列名
#pragma mark - fetching
- (NSFetchedResultsController *)fetchedResultsControllerCate
{
if (catefetchedResultsController == nil)
{
NSManagedObjectContext* mangedobjectContext=[self appDelegate].managedObjectContext;
NSEntityDescription *entity = [NSEntityDescription entityForName:frAddCategoryTable
inManagedObjectContext:mangedobjectContext];
NSFetchRequest *request= [[NSFetchRequest alloc] init];
NSString*dateStr=[NSString stringWithFormat:@"%@",[UserDefaluts objectForKey:frautoIncrement]];
NSPredicate *predicate =[NSPredicate predicateWithFormat:@"local_Id==%@",[DateValidator TimestapToDate:dateStr]];
NSSortDescriptor *sd1 = [[NSSortDescriptor alloc] initWithKey:@"local_Id" ascending:YES];
NSSortDescriptor *sd2 = [[NSSortDescriptor alloc] initWithKey:@"catName" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObjects:sd1,sd2, nil];
[request setSortDescriptors:sortDescriptors];
[request setEntity:entity];
[request setPredicate:predicate];
[request setFetchBatchSize:10];
catefetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:request
managedObjectContext:mangedobjectContext
sectionNameKeyPath:nil
cacheName:nil];
[catefetchedResultsController setDelegate:self];
NSError *error = nil;
if (![catefetchedResultsController performFetch:&error])
{
NSLog(@"Error performing fetch: %@", error);
}
}
return catefetchedResultsController;
}
我这是nsfetchview控制器的委托方法
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
if (controller==catefetchedResultsController)
{
[self.categoryTable reloadData];
}
}
这里当您更改文本字段范围时，此删除操作将被唤醒 它将为NSPredicate调用filterCate方法
- (BOOL)textField:(TypeTextfiled *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
NSString * searchStr = [textField.text stringByReplacingCharactersInRange:range withString:string];
if(textField == self.searchCate){
[self filterCate:searchStr];
}
return true;
}
请根据您的要求更改NSPredicate并更改名称
-(void)filterCate:(NSString*)text
{
filteredTableData = [[NSMutableArray alloc] init];
// Create our fetch request
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
// Define the entity we are looking for
NSManagedObjectContext* mangedobjectContext=[self appDelegate].managedObjectContext;
NSEntityDescription *entity = [NSEntityDescription entityForName:frCategoriesTable
inManagedObjectContext:mangedobjectContext];
[fetchRequest setEntity:entity];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"special==%i",0];
[fetchRequest setPredicate:predicate];
// If we are searching for anything...
if(text.length > 0)
{
// Define how we want our entities to be filtered
predicate = [NSPredicate predicateWithFormat:@"(catName CONTAINS[c] %@ AND special==%i)", text,0];
[fetchRequest setPredicate:predicate];
}
NSError *error;
// Finally, perform the load
NSArray* loadedEntities = [mangedobjectContext executeFetchRequest:fetchRequest error:&error];
filteredTableData = [[NSMutableArray alloc] initWithArray:loadedEntities];
[self.CategorTable reloadData];
}
表格视图
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)sectionIndex {
#warning Incomplete method implementation.
NSArray *sectionCate = [[self fetchedResultsControllerCate] sections];
if (tableView==self.categoryTable) {
if (sectionIndex < [sectionCate count])
{
id <NSFetchedResultsSectionInfo> sectionInfo = [sectionCate objectAtIndex:sectionIndex];
return sectionInfo.numberOfObjects;
}
}
return 0;
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 70;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
tableView.backgroundColor=[UIColor whiteColor];
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.selectionStyle=UITableViewCellSelectionStyleNone;
tableView.separatorStyle=UITableViewCellSeparatorStyleSingleLine;
tableView.separatorColor=[UIColor colorWithRed:216.0/255.0f green:216.0/255.0f blue:216.0/255.0f alpha:1.0/1.0f];
if(tableView==self.categoryTable){
cell=[self CategoryTablecreateCellFor:cell CellindexPath:indexPath];
}
return cell;
}
-(UITableViewCell*)CategoryTablecreateCellFor:(UITableViewCell*)cell CellindexPath:(NSIndexPath*)indexPath{
AddCategory*cateRecipe=(AddCategory*)[[self fetchedResultsControllerCate] objectAtIndexPath:indexPath];
UILabel *txt=[[UILabel alloc] initWithFrame:CGRectMake(130, 0, 150, 70)];
txt.text=cateRecipe.catName;
txt.textColor=[UIColor darkGrayColor];
[txt setFont: [UIFont fontWithName:@"Helvetica" size:15.0]];
cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
[cell.contentView addSubview:txt];
return cell;
}