触摸单元格时 UICollectionView 崩溃

Posted 2023-02-27

【中文标题】触摸单元格时 UICollectionView 崩溃

【英文标题】：UICollectionView Crashes when Cell is Touched

【发布时间】：2015-08-20 16:35:25

【问题描述】：

我有一个UICollectionView，其中有一个子类为UICollectionViewCell 的自定义类，显示来自应用程序内的图片。它加载正常，但如果任何单元格几乎没有被触摸，应用程序就会崩溃。控制台中没有错误消息，如果我输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

如果一个单元格被触摸，是什么导致它崩溃？如果我触摸单元格之间的空间，我可以让它滚动，但是所有单元格的任何触摸都会崩溃。

没有僵尸的崩溃截图：

僵尸崩溃截图：

【问题讨论】：

能否请您发布崩溃原因

@T_77 如果您真的阅读了这个问题，您会看到我所说的“控制台中没有错误消息，如果我输入异常断点也没有任何显示”

如果你使用instruments，有时你会得到一个崩溃的原因。尝试使用 Zombie 运行应用程序，看看崩溃时会发生什么

@T_77 从来不知道。做到了，得到了这个 ` *** -[ImagePicker retain]: message sent to deallocated instance 0x7fab6620a020 `

你能贴一张堆栈跟踪崩溃时的屏幕截图吗？

【参考方案1】：

您说当单元格被触摸时您的应用程序会崩溃，但您还没有实现单元格选择委托方法，而是只编写了单元格取消选择委托方法。试试这个

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

并在同一方法内插入断点进行调试。如果没有调用断点，那么问题出在其他地方

【讨论】：

你能发布你的崩溃报告吗？或者你能告诉你的编译器显示的错误信息是什么

*** -[ImagePicker retain]: message sent to deallocated instance 0x7fab6620a020

【参考方案2】：

可能问题出在您的 View Controller 类中：

@property 指向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

你能分享你UIViewController的代码吗？