ios - 带图像的水平滚动 uicollectionView

Question

我正在尝试在 collectionView 上显示图像。我在显示这些图像时遇到了麻烦，因为我创建了一个内部带有 imageView 的可重用单元格。这些图像之间的间距必须相等，因为我想一次在屏幕上显示 3 个图标。我使用了 13 个图标，并且它必须可以在屏幕上水平滚动。

• 我无法在单元格中显示图像，我不知道如何仅使用一个可重复使用的单元格设置图像单元格之间的间距

CustomCollectionViewCell.h

@interface CustomCollectionViewCell : UICollectionViewCell
@property (nonatomic, retain) UIImageView *imageView;

@end

CustomCollectionViewCell.m

   @implementation CustomCollectionViewCell

    - (UIImageView *) imageView {

   if (!_imageView) {
      _imageView = [[UIImageView alloc]      initWithFrame:self.contentView.bounds];
    [self.contentView addSubview:_imageView];
}

return _imageView;
   }

   - (void)prepareForReuse {

    [super prepareForReuse];

[self.imageView removeFromSuperview];
self.imageView = nil;
}
@end

LandingViewController.m

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

   CustomCollectionViewCell *cell = [cv    dequeueReusableCellWithReuseIdentifier:@"CustomCell" forIndexPath:indexPath];

return cell;
 }

Answer 1

现在 OP 想要收藏 View 的水平滚动方向。所以我再次为此创建了一个小示例项目。我在水平滚动方向上放置了 13 张图像。它在收藏 View 的水平方向上成功滚动。

为什么我在这里发布水平滚动的 collectionView 是每个人都可以理解答案并轻松获得解决方案。我添加了额外的图像我的意思是正好 13 张图像(op 想要 13 张图像到 Collection View )。这个答案肯定对您有帮助。

Horizo​​ntalScrollableCollectionView

这里我在CustomImageFlowLayout.m文件中设置了scrollDirection为Horizo​​ntal

CustomImageFlowLayout.h

#import <UIKit/UIKit.h>
@interface CustomImageFlowLayout : UICollectionViewFlowLayout
@end

CustomImageFlowLayout.m

#import "CustomImageFlowLayout.h"

@implementation CustomImageFlowLayout

- (instancetype)init
{
    self = [super init];
    if (self)
    {
        self.minimumLineSpacing = 1.0f;
        self.minimumInteritemSpacing = 1.0f;
        self.scrollDirection = UICollectionViewScrollDirectionHorizontal;
    }
    return self;
}

- (CGSize)itemSize
{
    NSInteger numberOfColumns;
    if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
       numberOfColumns = 3;
    else{
        if([UIApplication sharedApplication].statusBarOrientation==UIInterfaceOrientationPortrait)
            numberOfColumns = 4;
        else if([UIApplication sharedApplication].statusBarOrientation == UIDeviceOrientationLandscapeRight || [UIApplication sharedApplication].statusBarOrientation == UIDeviceOrientationLandscapeLeft)
            numberOfColumns = 4;
    }
    NSLog(@"The collection view frame is - %@",NSStringFromCGRect(self.collectionView.frame));
    CGFloat itemWidth = (CGRectGetWidth(self.collectionView.frame) - (numberOfColumns - 1)) / numberOfColumns;
    NSLog(@"The item width is - %f",itemWidth);
    return CGSizeMake(itemWidth, itemWidth);
}

@end

然后是UICollectionViewCell的CustomCell

CustomCell.xib

CustomCell.h

#import <UIKit/UIKit.h>
@interface CustomCell : UICollectionViewCell
@property (strong, nonatomic) IBOutlet UIImageView *img;
@property (strong, nonatomic) IBOutlet UILabel *lblCollection;
@end

CustomCell.m

#import "CustomCell.h"
@implementation CustomCell
- (void)awakeFromNib {
    [super awakeFromNib];
    // Initialization code
}
@end

现在 Storyboard设计开始

我的 Collection View 名称在这里collectionviewVerticalHorizo​​ntalFlowLayout

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UICollectionViewDelegate,UICollectionViewDataSource>

@property (strong, nonatomic) IBOutlet UICollectionView *collectionviewVerticalHorizontalFlowLayout;

@end

ViewController.m

#import "ViewController.h"
#import "CustomCell.h"
#import "CustomImageFlowLayout.h"


@interface ViewController (){
    NSMutableArray *arrayImages;
    NSMutableArray *arrayTitles;
    CustomCell *cell;
}

@end

@implementation ViewController

@synthesize collectionviewVerticalHorizontalFlowLayout;

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

    collectionviewVerticalHorizontalFlowLayout.collectionViewLayout = [[CustomImageFlowLayout alloc] init];
    collectionviewVerticalHorizontalFlowLayout.backgroundColor = [UIColor clearColor];

    arrayImages = [[NSMutableArray alloc]initWithObjects:@"iPhone.png", @"android.png", @"windows.png", @"blackberry.png", @"lenovovibek5note.png", @"redmi.png", @"moto.png", @"sony.png", @"samsung.png", @"oneplus.png",@"redminote4.png",@"oppo.png",@"vivo.png",nil];
    arrayTitles = [[NSMutableArray alloc]initWithObjects:@"iPhone", @"Android", @"Windows", @"Blackberry", @"LenovaVikeK5Note", @"Redmi", @"MotoG", @"Sony", @"Samsung", @"OnePlus", @"RedMiNote4",@"Oppo",@"Vivo",nil];

    UINib *cellNib = [UINib nibWithNibName:@"CustomCell" bundle:nil];
    [collectionviewVerticalHorizontalFlowLayout registerNib:cellNib forCellWithReuseIdentifier:@"cell"];

}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//UICollectionView Data Source Methods
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return  1;
}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return arrayImages.count;
}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"cell";
    cell = (CustomCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];
    if(cell==nil){
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:self options:nil];
        cell = nib[0];
    }
    cell.img.image = [UIImage imageNamed:(NSString*)[arrayImages objectAtIndex:indexPath.row]];
    NSLog(@"The collection view label text is - %@",[NSString stringWithFormat:@"%@",arrayTitles[indexPath.row]]);
    cell.lblCollection.text = arrayTitles[indexPath.row];
    cell.lblCollection.textColor = [UIColor blackColor];
    return cell;
}

//UICollectionView Delegate Method
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"the clicked indexPath.row is - %ld",(long)indexPath.row);
}


@end

最终输出截图

首先显示

然后如果我水平滚动在它显示的 Collection View 中