Question

我有一个UICollectionView控件，我想在网格中显示图像。但是，当我运行代码时，它显示黑色的空白屏幕。

我有cell - ColViewCell的单独课程，cell identifier=Cell 我也附上了课程。

我的代码如下。

ColViewController.h

#import <UIKit/UIKit.h>    
@interface ColViewController : UICollectionViewController     
@property (strong,nonatomic) NSArray *imgArray;       
@end

ColViewController.m

#import "ColViewController.h"
#import "ColViewCell.h"

@interface ColViewController ()

@end

@implementation ColViewController
@synthesize  imgArray;

static NSString * const reuseIdentifier = @"Cell";

- (void)viewDidLoad
{
    imgArray=[NSArray arrayWithObjects:@"a1.png",@"a2.png",@"a3.png",@"a4.png",@"b1.png",@"b2.png",@"b3.png",nil];

    self.collectionView.dataSource=self;

    self.collectionView.delegate=self;

    [super viewDidLoad];

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

#pragma mark <UICollectionViewDataSource>

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

    return [imgArray count];

}

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

{

    ColViewCell  *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier
                                                                forIndexPath:indexPath];    

    UIImage *image1;  

    NSInteger row = [indexPath row];

    image1 = [UIImage imageNamed:imgArray[row]];

    cell.imageView.image=image1;

    return cell;
}

@end

ColViewCell.h

#import <UIKit/UIKit.h>

@interface ColViewCell : UICollectionViewCell

@property (strong, nonatomic) IBOutlet UIImageView *imageView;

@end

ColViewCell.m

#import "ColViewCell.h" 

@implementation ColViewCell  

@synthesize imageView;

@end

Answer 1

将此添加到ColViewController.m viewDidLoad方法

[collectionView registerClass:[ColViewCell class] forCellWithReuseIdentifier:@"Cell"];

Answer 2

您没有在ViewDidload中注册粘贴此视图已加载

[_collectionView registerNib:[UINib nibWithNibName:@"ColViewCell" bundle:nil] forCellWithReuseIdentifier: reuseIdentifier];

UICollectionView显示空白屏幕/图像不显示

2 个答案: