无法search数据？

我已经添加search栏收集视图使用编程方式。但是当我input名称search什么都不显示。我也有一些部分，每个部分包含一些数据。

这是我的代码：

@interface ViewController () { NSMutableArray *arrayPDFName; NSMutableArray *titleArray; } @property (nonatomic,strong) NSArray *dataSourceForSearchResult; @property (nonatomic) BOOL searchBarActive; @property (nonatomic) float searchBarBoundsY; @property (nonatomic,strong) UISearchBar *searchBar; @property (nonatomic,strong) UIRefreshControl *refreshControl; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; self.dataSourceForSearchResult = [NSArray new]; titleArray = [NSMutableArray array]; [self getdata]; self.mycollectionView.dataSource = self; self.mycollectionView.delegate = self; [self.mycollectionView reloadData]; } -(NSString*)sha256HashFor:(NSString*)input { const char* str = [input UTF8String]; unsigned char result[CC_SHA256_DIGEST_LENGTH]; CC_SHA256(str, strlen(str), result); NSMutableString *ret = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH*2]; for(int i = 0; i<CC_SHA256_DIGEST_LENGTH; i++) { [ret appendFormat:@"%02x",result[i]]; } return ret; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } -(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; [self prepareUI]; } -(void)getdata { NSString *userName = @“[e-mail]"; NSString *password = @“password”; NSData *plainData = [password dataUsingEncoding:NSUTF8StringEncoding]; NSString *base64String = [plainData base64EncodedStringWithOptions:0]; base64String=[self sha256HashFor: base64String]; NSString *urlString = @"https://api.exampleport/user/orderid/files"; NSMutableURLRequest *request= [[NSMutableURLRequest alloc] init]; [request setURL:[NSURL URLWithString:urlString]]; [request setHTTPMethod:@"GET"]; // basic authendication NSString *authStr = [NSString stringWithFormat:@"%@:%@", userName, base64String]; NSData *authData = [authStr dataUsingEncoding:NSUTF8StringEncoding]; //header-field NSString *authValue = [NSString stringWithFormat:@"Basic %@", [authData base64Encoding]]; [request setValue:authValue forHTTPHeaderField:@"Authorization"]; NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *str = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; NSError * error; self->arrayPDFName = [[NSMutableArray alloc]init]; NSDictionary *jsonResults = [NSJSONSerialization JSONObjectWithData:returnData options:NSJSONReadingMutableContainers error:nil]; NSDictionary *dictOriginal = jsonResults[@“dark”]; [titleArray addObject:[NSString stringWithFormat:@"dark(%@)”, dictOriginal[@"count"]]]; NSDictionary *dictOriginal2 = jsonResults[@"orange”]; [titleArray addObject:[NSString stringWithFormat:@"orange(%@)”, dictOriginal2[@"count"]]]; NSDictionary *dictOriginal3 = jsonResults[@"pencill”]; [titleArray addObject:[NSString stringWithFormat:@"pencill(%@)”, dictOriginal3[@"count"]]]; NSDictionary *dictOriginal4 = jsonResults[@"smart”]; [titleArray addObject:[NSString stringWithFormat:@"smart(%@)”, dictOriginal4[@"count"]]]; NSArray *arrayFiles = [NSArray arrayWithObjects: dictOriginal, dictOriginal2, dictOriginal3, dictOriginal4, nil]; NSLog(@"str: %@", titleArray); for (NSDictionary *dict in arrayFiles) { NSMutableArray *arr = [NSMutableArray array]; NSArray *a = dict[@"files"]; for(int i=0; i < a.count; i ++) { NSString *strName = [NSString stringWithFormat:@"%@",[[dict[@"files"] objectAtIndex:i] valueForKey:@"name"]]; // NSLog(@"str: %@", strName); [arr addObject:strName]; } [arrayPDFName addObject:arr]; } //Get plist path NSString *errorDesc; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory1 = [paths objectAtIndex:0]; NSString *plistPath = [documentsDirectory1 stringByAppendingPathComponent:@"SampleData.plist"]; //NSLog(@"plistPath : %@",plistPath); //Save data from json to plist NSString *error1; returnData = [NSPropertyListSerialization dataFromPropertyList:jsonResults format:NSPropertyListXMLFormat_v1_0 errorDescription:&error]; if(returnData ) { if ([returnData writeToFile:plistPath atomically:YES]) { NSLog(@"Data successfully saved."); }else { NSLog(@"Did not managed to save NSData."); } } else { NSLog(@"%@",errorDesc); } // NSArray *stringsArray = [NSArray arrayWithContentsOfFile:plistPath]; NSDictionary *stringsDictionary = [NSDictionary dictionaryWithContentsOfFile:plistPath]; // NSLog(@"str: %@", stringsDictionary); } //delegate method for header -(UICollectionReusableView*) collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath { HeaderView * header = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"myHeader" forIndexPath:indexPath]; header.myHeaderLabel.text = titleArray[indexPath.section]; return header; } #pragma mark - UICollectionView Datasource -(NSInteger) numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return titleArray.count; } -(NSInteger) collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { if (self.searchBarActive) { return self.dataSourceForSearchResult.count; } NSArray *a = arrayPDFName[section]; if (a.count == 0) { return 1; } else { return a.count; } } - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section { return CGSizeMake(0, 80); } - (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath: (NSIndexPath *)indexPath { VenueCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"mycell" forIndexPath:indexPath]; cell.backgroundColor = [UIColor whiteColor]; cell.imgV.image = [UIImage imageNamed:@"doc1.png"]; if (self.searchBarActive) { cell.myLabel.text = _dataSourceForSearchResult[indexPath.section][indexPath.row]; }else{ NSArray *a = arrayPDFName[indexPath.section]; if (a.count == 0) { cell.myLabel.text = @"NO DATA"; return cell; } cell.myLabel.text = a[indexPath.row]; } return cell; } //////////////////////////for search bar ////////// #pragma mark - actions -(void)refreashControlAction{ [self cancelSearching]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ // stop refreshing after 2 seconds [self.mycollectionView reloadData]; [self.refreshControl endRefreshing]; }); } #pragma mark - search - (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope{ NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"self contains[c] %@", searchText]; self.dataSourceForSearchResult = [self->arrayPDFName filteredArrayUsingPredicate:resultPredicate]; } - (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{ // user did type something, check our datasource for text that looks the same if (searchText.length>0) { // search and reload data source self.searchBarActive = YES; [self filterContentForSearchText:searchText scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]]; [self.mycollectionView reloadData]; }else{ // if text lenght == 0 // we will consider the searchbar is not active self.searchBarActive = NO; } } - (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{ [self cancelSearching]; [self.mycollectionView reloadData]; } - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{ self.searchBarActive = YES; [self.view endEditing:YES]; } - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar{ // we used here to set self.searchBarActive = YES // but we'll not do that any more... it made problems // it's better to set self.searchBarActive = YES when user typed something [self.searchBar setShowsCancelButton:YES animated:YES]; } - (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar{ // this method is being called when search btn in the keyboard tapped // we set searchBarActive = NO // but no need to reloadCollectionView self.searchBarActive = NO; [self.searchBar setShowsCancelButton:NO animated:YES]; } -(void)cancelSearching{ self.searchBarActive = NO; [self.searchBar resignFirstResponder]; self.searchBar.text = @""; } #pragma mark - prepareVC -(void)prepareUI{ [self addSearchBar]; [self addRefreshControl]; } -(void)addSearchBar{ if (!self.searchBar) { self.searchBarBoundsY = self.navigationController.navigationBar.frame.size.height + [UIApplication sharedApplication].statusBarFrame.size.height; self.searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0,self.searchBarBoundsY, [UIScreen mainScreen].bounds.size.width, 50)]; self.searchBar.searchBarStyle = UISearchBarStyleMinimal; self.searchBar.tintColor = [UIColor whiteColor]; self.searchBar.barTintColor = [UIColor whiteColor]; self.searchBar.delegate = self; self.searchBar.placeholder = @"Search here"; [[UITextField appearanceWhenContainedIn:[UISearchBar class], nil] setTextColor:[UIColor whiteColor]]; // add KVO observer.. so we will be informed when user scroll colllectionView [self addObservers]; } if (![self.searchBar isDescendantOfView:self.view]) { [self.view addSubview:self.searchBar]; } } -(void)addRefreshControl{ if (!self.refreshControl) { self.refreshControl = [UIRefreshControl new]; self.refreshControl.tintColor = [UIColor whiteColor]; [self.refreshControl addTarget:self action:@selector(refreashControlAction) forControlEvents:UIControlEventValueChanged]; } if (![self.refreshControl isDescendantOfView:self.mycollectionView]) { [self.mycollectionView addSubview:self.refreshControl]; } } -(void)startRefreshControl{ if (!self.refreshControl.refreshing) { [self.refreshControl beginRefreshing]; } } 

我在哪里做错了，我需要改变工作。提前感谢！

Answer 1

看来你的arrayPDFName有数组对象，每个数组对象都有string对象。 有两种方法来过滤你的数组。

方法 – 1

如果你想获得具有searchstring的数组列表，使用SUBQUERY和谓词。 像下面一样。

 NSArray *a1 = @[@"a1", @"a2", @"a3"]; NSArray *a2 = @[@"a1", @"a2", @"a3"]; NSArray *a3 = @[@"a1", @"a2", @"a3"]; NSArray *a4 = @[@"a2", @"a3"]; NSArray *allA = @[a1, a2, a3, a4]; NSPredicate *pre = [NSPredicate predicateWithFormat:@"SUBQUERY(SELF, $a, $a == %@).@count > 0", @"a1"]; NSArray *a = [allA filteredArrayUsingPredicate:pre]; 

方式 – 2

如果您想从每个数组对象中单独获取searchstring，请按照下面的说明进行操作，

 NSMutableArray *fa = [[NSMutableArray alloc] init]; for (NSArray *a in allA) { NSPredicate *p = [NSPredicate predicateWithFormat:@"self CONTAINS[c] %@", @"a3"]; [fa addObjectsFromArray:[a filteredArrayUsingPredicate:p]]; } 

注意：上面的代码使用相同的样本数据完成。 把它replace成你想要的。

根据你的代码replace下面的代码

 -(void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope { NSMutableArray *fa = [[NSMutableArray alloc] init]; for (NSArray *a in arrayPDFName) { NSPredicate *p = [NSPredicate predicateWithFormat:@"self CONTAINS[c] %@", searchText]; [fa addObjectsFromArray:[a filteredArrayUsingPredicate:p]]; } self.dataSourceForSearchResult = [NSArray arrayWithArray:fa]; } -(NSInteger) numberOfSectionsInCollectionView:(UICollectionView *)collectionView { if(self.searchBarActive) return 1; return titleArray.count; } 

在cellForItemAtIndexPath

 cell.myLabel.text = _dataSourceForSearchResult[indexPath.row];