Question

我有一个小问题..

为方便起见，让您更好地了解如何共享集合视图：

Collectionview 1具有自定义段控制功能（它具有自定义UICollectionView自定义类）

Collectionview 2包含充当页面的单元格（它有一个UICollectionViewController类）。

我有一个UIViewController，它包含我用来创建自定义段控件的collectionview1（如菜单）
指示选择了哪个单元格的光标是在collectionView 1类中使用uiview创建的。
在我的主视图控制器中，除了具有集合视图外，我还插入了一个容器视图，其中包含一个集合视图控制器，用于通过水平滚动显示所选页面。

当我想将 ContentOffset值传递到collectionView2 scrollViewDidScroll到collectionView 1 中的光标时，我的问题就出现了。

我尝试初始化collectionView 2类中的collectionview 1类以直接使用游标，但我没有得到任何结果。

你能帮我理解如何解决这个问题吗？

这是Class CollectionView 1（菜单）

-(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];
}

这是CollectionView 2（页面单元格）的代码

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);
}

我需要在collectionView 2类中传递scrollViewDidScroll方法的ContentOffset值，并在collectionView类1中使用它

Objective C在两个类之间传递CGFloat值

0 个答案: