ios - Collection View 单元格显示不显示

Question

我有一个collectionview Controller 和一个collectionviewcell。对于collectionviewcell，我有一个自定义类。我正在尝试设置 uiimage，但它不起作用。

提前谢谢您!

我试图设置图像的collectionview Controller 中的方法。

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

    static NSString *cellIdentifier=@"Cell";

    CollectionVIewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];
    ;
    CollectionVIewCell *feederCell = (CollectionVIewCell*)[_availableFilters objectAtIndex:indexPath.row];



    cell.labelDisplay.text=feederCell.filterName;
    NSLog(@"selected =%@",cell.labelDisplay.text);
    if (feederCell.isSelected) {
        UIImageView *imageView=[[UIImageView alloc]init];
        //process string name
        NSString*filePath =[NSString stringWithFormat:@"%@.png",feederCell.filterName];
        NSArray* words = [filePath componentsSeparatedByCharactersInSet :[NSCharacterSet whitespaceCharacterSet]];
        filePath=[words componentsJoinedByString:@""];
        cell.FilePath=filePath;
        //image
        UIImage *image = [UIImage imageNamed:filePath];
        [imageView setFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
        [imageView setImage:image];
        [cell setIconDisplay:imageView];//setting the image that won't set
    }else if(!feederCell.isSelected){
        UIImageView *imageView=[[UIImageView alloc]init];
        NSString*filePath =[NSString stringWithFormat:@"%@.png",feederCell.filterName];
        NSArray* words = [filePath componentsSeparatedByCharactersInSet :[NSCharacterSet whitespaceCharacterSet]];
        filePath=[words componentsJoinedByString:@""];
        UIImage *image = [UIImage imageNamed:filePath];
        [imageView setFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
        [imageView setImage:image];
        [cell setIconDisplay:imageView];
    }

    return cell;

.h 文件

//
//  CollectionVIewCell.h

#import <UIKit/UIKit.h>

@interface CollectionVIewCell : UICollectionViewCell
@property (strong, nonatomic) IBOutlet UIImageView *IconDisplay;
@property (strong, nonatomic) IBOutlet UILabel *labelDisplay;
@property (assign,nonatomic) BOOL isSelected;
@property (strong,nonatomic)NSString*textName;
@property(strong,nonatomic)NSString*FilePath;

@end

.m文件

//
//  CollectionVIewCell.m

#import "CollectionVIewCell.h"

@implementation CollectionVIewCell

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        _labelDisplay.text=_textName;
        _IconDisplay=[[UIImageView alloc]init];
    }
    return self;
}

@end

Answer 1

您需要将 UIImageView 添加为 subview 。否则它存在但不显示。