I have a small problem ..
For convenience and to make you understand better how to share the collection View:
Collectionview 1 has the customized segment control function (it has a custom UICollectionView custom class)
Collectionview 2 contains the cells that function as pages (it has a UICollectionViewController class).
I have an UIViewController that contains the collectionview1 that I used to create a custom segment control (like a menu)
The cursor indicating which cell was selected was created with a uiview in the collectionView 1 class.
In my main view controller in addition to having a collectionview I also inserted a container view that contains a collectionview controller that will be used to show the selected pages through a horizontal scroll.
My problem now appears when I want to pass the ContentOffset value into the collectionView2 scrollViewDidScroll to the cursor in the collectionView 1.
I tried to initialize the collectionview 1 class in the collectionView 2 class to use the cursor directly but I do not get any results.
Can you help me understand how to solve this problem?
This is Class CollectionView 1 ( Menu )
-(instancetype)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
[self setupControl];
}
return self;
}
-(void)setupControl {
self.delegate = self;
self.dataSource = self;
self.pagingEnabled = YES;
self.showsHorizontalScrollIndicator = NO;
UINib *nib = [UINib nibWithNibName:@"UDSectionNavCell" bundle: nil];
[self registerNib:nib forCellWithReuseIdentifier:@"SCC"];
[self layout];
_horizontalCursorBar = [[UDSectionNavCursor alloc] init];
_horizontalCursorBar.frame = CGRectMake(0, self.frame.size.height - 6, self.frame.size.width / 4, 3);
_horizontalCursorBar.layer.cornerRadius = 3;
_horizontalCursorBar.backgroundColor = [UIColor colorWithHexString:@"#C1C1C1" setAlpha:1];
_horizontalCursorBar.alpha = 1;
[self addSubview:_horizontalCursorBar];
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:0];
[self selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionNone];
}
-(void)layout {
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
layout.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0);
layout.itemSize = CGSizeMake(self.frame.size.width / 4, self.frame.size.height);
layout.minimumInteritemSpacing = 10;
layout.minimumLineSpacing = 0;
layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
self.collectionViewLayout = layout;
[self reloadData];
}
-(NSArray *)dataPage {
return [NSArray arrayWithObjects:@"ATENEO",@"STATISTICHE",@"CALENDARIO",@"NOTIFICHE", nil];
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return [self dataPage].count;
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(nonnull NSIndexPath *)indexPath {
static NSString *cellID = @"SCC";
UDSectionNavCell *cell = (UDSectionNavCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellID forIndexPath:indexPath];
cell.titlePage.text = [[self dataPage] objectAtIndex:indexPath.item];
return cell;
}
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
NSIndexPath *newIndexPath = [NSIndexPath indexPathForItem:indexPath.row inSection:0];
[self scrollToItemAtIndexPath:newIndexPath atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally animated:YES];
if (indexPath == newIndexPath) {
[self scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally animated:YES];
}
[UIView animateWithDuration:.5 delay:0 usingSpringWithDamping:1 initialSpringVelocity:1 options:UIViewAnimationOptionCurveEaseOut animations:^{
CGFloat x = (indexPath.item) * self.frame.size.width / 4;
_horizontalCursorBar.frame = CGRectMake(x, self.frame.size.height - 6, self.frame.size.width / 4, 3);
} completion:nil];
}
This is the code of CollectionView 2 (page cell)
static NSString * const reuseIdentifier = @"Cell";
- (void)viewDidLoad {
[super viewDidLoad];
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];
UICollectionViewFlowLayout *collectionLayout = [[UICollectionViewFlowLayout alloc] init];
collectionLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
collectionLayout.minimumLineSpacing = 0;
self.collectionView.collectionViewLayout = collectionLayout;
[self.collectionView reloadData];
self.collectionView.pagingEnabled = YES;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
#pragma mark <UICollectionViewDataSource>
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return 4;
}
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(nonnull UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(nonnull NSIndexPath *)indexPath {
return CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
NSArray *array = [NSArray arrayWithObjects:[UIColor redColor],[UIColor blueColor], [UIColor clearColor], [UIColor grayColor], nil];
cell.backgroundColor = array[indexPath.item];
return cell;
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
NSLog(@"%f",scrollView.contentOffset.x / 4);
}
I would need to pass the ContentOffset value of the scrollViewDidScroll method in the collectionView 2 class and use it in the collectionView class 1
