我正在使用带有搜索栏的集合视图。我通过 cod 添加了搜索栏，起始位置为 (0,0)，从顶部开始。所以现在我的图像看起来像这样：
[![在此处输入图像描述][1]][1]
但我需要将标题转到我的搜索栏。我是通过故事板完成的。但是在运行时，我的标题名称和搜索栏具有相同的来源。我需要将标题部分放在搜索栏下方。
注意：我唱了 3 个部分标题。任何想法或代码都非常有帮助。
这是我的搜索栏代码......
#import "CollectionViewController.h"
#import "CollectionViewCell.h"
@interface CollectionViewController ()<UISearchBarDelegate>
@property (nonatomic,strong) NSArray *dataSource;
@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 CollectionViewController
static NSString * const reuseIdentifier = @"Cell";
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
// datasource used when user search in collectionView
self.dataSourceForSearchResult = [NSArray new];
// normal datasource
self.dataSource =@[@"Modesto",@"Rebecka",@"Andria",@"Sergio",@"Robby",@"Jacob",@"Lavera",@"Theola",@"Adella",@"Garry", @"Lawanda", @"Christiana", @"Billy", @"Claretta", @"Gina", @"Edna", @"Antoinette", @"Shantae", @"Jeniffer", @"Fred", @"Phylis", @"Raymon", @"Brenna", @"Gus", @"Ethan", @"Kimbery", @"Sunday", @"Darrin", @"Ruby", @"Babette", @"Latrisha", @"Dewey", @"Della", @"Dylan", @"Francina", @"Boyd", @"Willette", @"Mitsuko", @"Evan", @"Dagmar", @"Cecille", @"Doug", @"Jackeline", @"Yolanda", @"Patsy", @"Haley", @"Isaura", @"Tommye", @"Katherine", @"Vivian"];
}
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[self prepareUI];
}
-(void)dealloc{
// remove Our KVO observer
[self removeObservers];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#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.collectionView reloadData];
[self.refreshControl endRefreshing];
});
}
#pragma mark - <UICollectionViewDataSource>
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
if (self.searchBarActive) {
return self.dataSourceForSearchResult.count;
}
return self.dataSource.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
// Configure the cell
if (self.searchBarActive) {
cell.laName.text = self.dataSourceForSearchResult[indexPath.row];
}else{
cell.laName.text = self.dataSource[indexPath.row];
}
return cell;
}
#pragma mark - <UICollectionViewDelegateFlowLayout>
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout*)collectionViewLayout
insetForSectionAtIndex:(NSInteger)section{
return UIEdgeInsetsMake(self.searchBar.frame.size.height, 0, 0, 0);
}
- (CGSize)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout*)collectionViewLayout
sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
CGFloat cellLeg = (self.collectionView.frame.size.width/2) - 5;
return CGSizeMake(cellLeg,cellLeg);;
}
#pragma mark - search
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope{
NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"self contains[c] %@", searchText];
self.dataSourceForSearchResult = [self.dataSource 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.collectionView reloadData];
}else{
// if text lenght == 0
// we will consider the searchbar is not active
self.searchBarActive = NO;
}
}
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{
[self cancelSearching];
[self.collectionView 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, 44)];
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.collectionView]) {
[self.collectionView addSubview:self.refreshControl];
}
}
-(void)startRefreshControl{
if (!self.refreshControl.refreshing) {
[self.refreshControl beginRefreshing];
}
}
#pragma mark - observer
- (void)addObservers{
[self.collectionView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil];
}
- (void)removeObservers{
[self.collectionView removeObserver:self forKeyPath:@"contentOffset" context:Nil];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(UICollectionView *)object change:(NSDictionary *)change context:(void *)context{
if ([keyPath isEqualToString:@"contentOffset"] && object == self.collectionView ) {
self.searchBar.frame = CGRectMake(self.searchBar.frame.origin.x,
self.searchBarBoundsY + ((-1* object.contentOffset.y)-self.searchBarBoundsY),
self.searchBar.frame.size.width,
self.searchBar.frame.size.height);
}
}
@end
