ios - UICollectionView 并使用 Parse 推送到 detailViewController

Question

我使用 tapGesture 方法将图像从 UICollectionView 打包到 detailViewController viewController.h 如下:

#import <Parse/Parse.h>


@interface CardsViewController : UIViewController <UICollectionViewDelegateFlowLayout> {
    NSMutableArray *allImages;
    NSArray *cardFileArray;
}

@property (weak, nonatomic) IBOutlet UICollectionView *imageCollection

和viewController.m如下

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return [cardFileArray count];
}


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

    static NSString *identifier = @"MyCell";

    Cards *cell = (Cards *)[collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

    PFObject *imageObject = [cardFileArray objectAtIndex:indexPath.row];
    PFFile *imageFile = [imageObject objectForKey:KEY_IMAGE4];

    cell.spinController.hidden = NO;
    [cell.spinController startAnimating];

    [imageFile getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
        if (!error) {
            cell.imageView.image = [UIImage imageWithData:data];
            [cell.spinController stopAnimating];
            cell.spinController.hidden = YES;

        }
    }];




    return cell;
}

- (void)singleTapGestureCaptured:(UITapGestureRecognizer *)gesture{

    CGPoint touchPoint = [gesture locationInView:imageCollection];
    NSUInteger touchPage = floorf(touchPoint.x / imageCollection.frame.size.width);

    NSIndexPath *indexPath = [imageCollection indexPathForItemAtPoint:touchPoint];

    if (indexPath == nil) {
        touchPage = touchPage % ([allImages count]);
    }


    //Push the image to another view
    detailViewController*ptvc = [self.storyboard instantiateViewControllerWithIdentifier:@"imageDetail"];
    [self.navigationController pushViewController:ptvc animated:YES];
    ptvc.imageString = [cardFileArray objectAtIndex:touchedPage];

 }

detailViewController.h如下

@property (strong, nonatomic) IBOutlet UIImageView *Preview;
@property (strong, nonatomic) UIImage *imagePreview;

所以对于 DetailViewController，我在 viewDidload 中放入了这一行

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    //self.imageView.image = [UIImage imageNamed:self.imageViewDetail];
    self.Preview.image = self.imagePreview;



}

但应用程序崩溃并在 viewDidload 上标记行 ;所以我需要将 uicollectionView 上的图像推送到 detailView 的任何建议

Answer 1

要解决这个问题，首先你需要在 didselect from parse 中识别图像并声明 segue 以及以下内容

[self performSegueWithIdentifier:@"showDetails" sender:imageCollection];
    PFObject *object = [cardFileArray objectAtIndex:indexPath.row];
    PFFile *file = [object objectForKey:KEY_IMAGE4];

    [file getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
        if (!error) {

            Cards *recipe = [[Cards alloc] init];
            recipe.imageView.image = [UIImage imageWithData:data];

        }
    }];

然后您执行 Segue 方法并正常链接到详细信息 View ，而不是以下内容

链接到“you cell”和单元格中的 ImageView

最后，将您的单元格导入详细 View 并在您的头文件中声明它(这将链接到您的 segue)

希望对你有帮助