ios - 如何将保存的相册中的图像添加到 Collection View 单元格中？

Question

我必须制作一个类似于 iPhone 中的照片应用程序的照片库。我包含了一个 Collection View 来显示图像。当我点击插入图片按钮时，会显示照片应用程序保存的相册(使用 UIImagePicker)。但我无法将图像加载回自定义 collectionViewCell。 CollectionViewCell 包含一个 UIImageView。

Answer 1

collectionView 的 cellForItemAtIndexPath 应该如下所示。

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    //create cel...
    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];

    //create UIImageView (declare imageView in header file)
    self.cellImageView = [[UIImageView alloc] initWithFrame:"YOUR FRAME"];
    //set image. delete this line if there's no before picking image in uipickercontroller
    [self.cellImageView setImage:"YOUR IMAGE BEFORE USING IMAGEPICKER"];
    [cell addSubView:self.cellImageView];
    return cell;
}

您 didFinishPickingMediaWithInfo 应该看起来像这样...

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    //set image when image is chosen from image picker controller
    self.cellImageView = chosenImage;
    //reload collectionView
    [self.collectionView reloadData];

    [picker dismissViewControllerAnimated:YES completion:NULL];

}