not able to search the data? - ios

Question

I have added search bar for collection view using programatically .But when i enter the names to search nothing shows.I have some section also and each section contains some data.
Here is my code:
#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 = #“username#yahoo.com";
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];
}
}
Where i am doing mistake and what i need to change to work.Thanks in advance!

Answer 1

It seems your arrayPDFName have array object and each array object have string object. There are two ways to filter you array.
Way - 1
If you want to get the list of array which has the search string the use SUBQUERY with your predicate. Like below.
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];
Way - 2
If you want to get the search string alone from each array object then follow the below,
NSMutableArray *fa = [[NSMutableArray alloc] init];
for (NSArray *a in allA) {
NSPredicate *p = [NSPredicate predicateWithFormat:#"self CONTAINS[c] %#", #"a3"];
[fa addObjectsFromArray:[a filteredArrayUsingPredicate:p]];
}
Note: Above code done with same sample data. Replace it as you want.
As per your code replace the below code
-(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;
}
In cellForItemAtIndexPath
cell.myLabel.text = _dataSourceForSearchResult[indexPath.row];