我已经以编程方式为集合视图添加了搜索栏。但是当我输入要搜索的名称时没有显示。我也有一些部分，每个部分都包含一些数据。
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 = @“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];
}
}
我在做错误以及我需要改变工作的地方。提前谢谢！
答案 0 :(得分：3)
看来你的arrayPDFName有数组对象，每个数组对象都有字符串对象。有两种方法可以过滤你的数组。
方式 - 1
如果要获取具有搜索字符串的数组列表，请使用带有谓词的SUBQUERY。如下所示。
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搜索字符串，请按照下面的步骤
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：以上代码使用相同的示例数据完成。根据需要更换它。
根据您的代码替换以下代码
-(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];