iOS-水平滚动具有图像的collectionView [英] ios - horizontally scrolling collectionView with images

问题描述

我正在尝试在collectionView上显示图像.我在创建一个带有imageView的可重用单元格时无法显示这些图像，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.我正在使用13个图标，它必须在屏幕上水平滚动.

I am trying to show images on collectionView. I have trouble showing this images as I have created a reusable cell with imageView inside.Those images have to be equally spaced between as I want to show 3 icons on screen at once. I am using 13 icons and it has to be scrollable horizontally through screen.

• 我无法在单元格中显示图像，我也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与它们之间的间距

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;
 }

推荐答案

现在OP想要Collection视图的水平滚动方向.因此，我再次为此创建了一个小型示例项目.我将13个图像沿水平滚动方向放置.集合视图的水平方向.

Now OP wants horizontal scrollable direction of Collection view.So Again I created small sample project for this.I put 13 images in horizontal scroll direction.It scrolls successfully on horizontal direction of collection view.

为什么我要发布水平可滚动的collectionView，这是每个人都可以理解答案并轻松获得解决方案的原因.我添加了额外的图像，我的意思是恰好是13张图像(op希望将13张图像放入集合视图).这个答案肯定会对您有所帮助.

Why I post the horizontal scrollable collectionView here is everyone can understand the answer and get the solution easily.I added extra image I mean exactly 13 images(op wants 13 images into collection view). This answer definitely helps you.

Horizo​​ntalScrollableCollectionView

在这里，我在CustomImageFlowLayout.m文件中将scrollDirection设置为Horizo​​ntal

Here I set the scrollDirection as Horizontal in CustomImageFlowLayout.m file

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

Then CustomCell of UICollectionViewCell

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

我的集合视图名称在此处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

最终放出的屏幕截图

首先显示

然后如果我在集合视图中水平滚动，则会显示

这篇关于iOS-水平滚动具有图像的collectionView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！