Question

我有UICollectionView个自定义类子类化为UICollectionViewCell，显示应用内的图片。它加载很好，但如果任何单元格甚至几乎没有触及，应用程序崩溃。控制台中没有错误消息，如果我放入异常断点，也没有任何显示。包含Collection View的视图控制器的代码是：

#import "ImagePicker.h"
#import "CMFGalleryCell.h"
@interface ImagePicker ()
@property (nonatomic, weak) IBOutlet UICollectionView *collectionView;
@property (nonatomic, strong) NSArray *dataArray;
@end

@implementation ImagePicker
@synthesize dataArray, collectionView;
- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"Choose Image";
    [self loadImages];
    [self setupCollectionView];

    // Do any additional setup after loading the view from its nib.
}
-(void)setupCollectionView {
    [self.collectionView registerClass:[CMFGalleryCell class] forCellWithReuseIdentifier:@"cellIdentifier"];

    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
    [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
    [flowLayout setMinimumInteritemSpacing:0.0f];
    [flowLayout setMinimumLineSpacing:0.0f];
    [self.collectionView setPagingEnabled:YES];
    [self.collectionView setCollectionViewLayout:flowLayout];

}

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return [self.dataArray count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    CMFGalleryCell *cell = (CMFGalleryCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];
    NSString *imageName = [self.dataArray objectAtIndex:indexPath.row];
    [cell setImageName:imageName];

    [cell updateCell];
    return cell;
}
-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"Chose%ld", (long)indexPath.row);
}
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    return CGSizeMake(185, 185);
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
    return 1.0;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return 1.0;
}

// Layout: Set Edges
- (UIEdgeInsets)collectionView:
(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    // return UIEdgeInsetsMake(0,8,0,8);  // top, left, bottom, right
    return UIEdgeInsetsMake(0,0,0,0);  // top, left, bottom, right
}
-(void)loadImages {
    NSString *sourcePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"inviteimages"];
    self.dataArray = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:sourcePath error:NULL];
    NSLog(@"%@", self.dataArray);
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end

自定义单元格是：

#import "CMFGalleryCell.h"

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

@implementation CMFGalleryCell

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        NSArray *arrayOfViews = [[NSBundle mainBundle] loadNibNamed:@"CMFGalleryCell" owner:self options:nil];

        if ([arrayOfViews count] < 1) {
            return nil;
        }

        if (![[arrayOfViews objectAtIndex:0] isKindOfClass:[UICollectionViewCell class]]) {
            return nil;
        }

        self = [arrayOfViews objectAtIndex:0];
    }

    return self;
}

-(void)updateCell {

    NSString *sourcePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"inviteimages"];
    NSString *filename = [NSString stringWithFormat:@"%@/%@", sourcePath, self.imageName];

    UIImage *image = [UIImage imageWithContentsOfFile:filename];

    [self.imageView setImage:image];
    [self.imageView setContentMode:UIViewContentModeScaleAspectFill];

}

@end

如果触摸一个单元格会导致它崩溃的原因是什么？如果我触摸单元格之间的空间，我可以让它滚动，但所有单元格崩溃都会触摸。

没有僵尸的崩溃截图：

僵尸崩溃的屏幕截图：

Answer 1

你说你的应用程序会在触摸单元格时崩溃，但你还没有实现单元格选择委托方法，但只写了单元格取消选择委托方法。试试这个

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

在同一方法中插入一个断点进行调试。如果没有调用断点，那么其他问题就是

Answer 2

您的View Controller类可能存在问题：

@property ImagePicker的链接可以是weak，例如，您可以将其从超级视图中删除。在此之后，ImagePicker对象将被释放。尝试替换

@property (weak, nonatomic) ImagePicker *someImagePicker

与

@property (strong, nonatomic) ImagePicker *someImagePicker

您可以分享UIViewController的代码吗？

触摸单元格时，UICollectionView崩溃

2 个答案: