如何水平和垂直滚动collectionview单元..我正在使用9单元格集合视图

Question

我对集合视图是全新的，请在集合视图中帮助我垂直和水平滚动单元格：

viewcontroller.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UICollectionViewDataSource,UICollectionViewDelegate>
{

UICollectionView *collectionView;

}
@end



viewcontroller.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];

    collectionView=[[UICollectionView alloc] initWithFrame:self.view.frame 
collectionViewLayout:layout];

    [collectionView setDataSource:self];

    [collectionView setDelegate:self];

    [collectionView registerClass:[UICollectionViewCell class] 

forCellWithReuseIdentifier:@"cellIdentifier"];

    [collectionView setBackgroundColor:[UIColor redColor]];

    [self.view addSubview:collectionView];

    // Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{

    return 9;

}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{

    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];


    cell.backgroundColor=[UIColor greenColor];

    return cell;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{

    return CGSizeMake(100, 100);

}
@end

Answer 1

我在这里有点晚了，但是为了防止其他人查看，你可以使用UICollectionViewFlowLayout轻松设置你的集合视图滚动方向。

1. 创建UICollectionViewFlowLayout的实例
2. 将scrollDirection设置为UICollectionViewScrollDirectionHorizo​​ntal

3. 飘柔。

   - （instancetype）init {     UICollectionViewFlowLayout * layout = [[UICollectionViewFlowLayout alloc] init];     layout.itemSize = CGSizeMake（106,106）;     layout.minimumInteritemSpacing = 1;     layout.minimumLineSpacing = 1;     layout.scrollDirection = UICollectionViewScrollDirectionHorizo​​ntal;     self = [super initWithCollectionViewLayout：layout];     回归自我; }

Answer 2

您可以使用以下UICollectionView类的方法以编程方式滚动集合视图：

[collectionView scrollsToTop];
[collectionView scrollToItemAtIndexPath:<#(NSIndexPath *)#> atScrollPosition:<#(UICollectionViewScrollPosition)#> animated:<#(BOOL)#>];
[collectionView scrollRectToVisible:<#(CGRect)#> animated:<#(BOOL)#>];