ios

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问题，因为我创建了一个带有 imageView inside.Those 的可重用单元格，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。我正在使用 13 个图标，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，而且我不知道如何仅使用一个可重复使用的单元格来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

有求必应

我想把同样的事情合二为一 application.I 成功实施 this.Just 现在我尝试了您的示例项目 question.I 得到了您的要求 exactly.I 给您看代码以及下面的所有内容。

NSObject 的第一个 CustomImageFlowLayout Class

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 = UICollectionViewScrollDirectionVertical;
    }
    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

之后我为图像创建了自定义单元格

先看看我的设计

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
@end

然后我在ViewController

中使用上面的class

下面是我的故事板设计

这里我的 CollectionView 名称是 collectionViewVertical

ViewController.h

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>
@property (strong, nonatomic) IBOutlet UICollectionView *collectionViewVertical;
@end

ViewController.m

#import "ViewController.h"
#import "CustomCell.h"
#import "CustomImageFlowLayout.h"
@interface ViewController ()
{
    NSMutableArray *arrayImages;
    NSMutableArray *arrayTitles;
    CustomCell *cell;
}
@end

@implementation ViewController

@synthesize collectionViewVertical;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    collectionViewVertical.collectionViewLayout = [[CustomImageFlowLayout alloc] init];
    collectionViewVertical.backgroundColor = [UIColor clearColor];

    arrayImages = [[NSMutableArray alloc]initWithObjects:@"iPhone", @"Android", @"Windows", @"Blackberry", @"Lenova", @"Redmi", @"MotoG", @"Sony", @"Samsung", @"OnePlus", nil];
    arrayTitles = [[NSMutableArray alloc]initWithObjects:@"iPhone.png", @"android.png", @"windows.png", @"blackberry.png", @"lenovo.png", @"redmi.png", @"moto.png", @"sony.png", @"samsung.png", @"oneplus.png", nil];

    UINib *cellNib = [UINib nibWithNibName:@"CustomCell" bundle:nil];
    [collectionViewVertical 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]];
    cell.lblCollection.text = arrayTitles[indexPath.row];

    return cell;
}

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

终于输出画面了

Answer 2

现在 OP 想要 Collection 的水平滚动方向 view.So 我再次为 this.I 创建了一个小示例项目，将 13 个图像水平滚动 direction.It 在水平方向上成功滚动collection 视图。

为什么我post水平滚动collection查看这里是每个人都可以理解的答案并得到解决方案easily.I添加额外的图像我的意思是正好13张图片（op想要13张图片进入 collection 视图）。这个答案绝对对你有帮助。

HorizontalScrollableCollectionView

这里我在CustomImageFlowLayout.m文件

中将scrollDirection设置为Horizontal

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

现在故事板设计开始

我的 collection 视图名称在这里 collectionviewVerticalHorizontalFlowLayout

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 如果我在 collection 视图中水平滚动 它会显示

ios - 水平滚动带图像的 collectionView

ios - horizontally scrolling collectionView with images

image

objective-c

uiscrollview

uicollectionviewcell