在UICollectionView中复制标注 [英] Copy Callout in UICollectionView

问题描述

我在每个单元格中都有一个带UIImageView的UICollectionView，现在我想添加Copy Callout，就像在Photos.app中一样：

I have a UICollectionView with UIImageView in each cell, now I want to add Copy Callout, like in Photos.app:

我在UICollectionViewDelegate中看到了这个方法：

I saw this method in the UICollectionViewDelegate:

- (BOOL)collectionView:(UICollectionView *)collectionView shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {
    return YES;
}

经过几分钟的研究后，我找到了UIMenuController Class，据我所知，我必须使用它来获取菜单，但无论如何，我认为必须有更简单的方法然后创建UIGestureRecognizer，创建，定位等我的UIMenu。

After few additional minutes of research I found UIMenuController Class, as I understood, I must to work with it to get the Menu, but anyway, I think that there must to be more simple way then creating UIGestureRecognizer, and creating, positioning etc. my UIMenu.

我是否在正确的轨道上？你怎么能实现这个功能？

推荐答案

这是完整的解决方案：

- (BOOL)collectionView:(UICollectionView *)collectionView shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {
        return YES;
    }

- (BOOL)collectionView:(UICollectionView *)collectionView canPerformAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
        if ([NSStringFromSelector(action) isEqualToString:@"copy:"])
            return YES;
        else
            return NO;
    }

- (void)collectionView:(UICollectionView *)collectionView performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
        if ([NSStringFromSelector(action) isEqualToString:@"copy:"]) {
            UIPasteboard *pasteBoard = [UIPasteboard pasteboardWithName:UIPasteboardNameGeneral create:NO];
            pasteBoard.persistent = YES;
            NSData *capturedImageData = UIImagePNGRepresentation([_capturedPhotos objectAtIndex:indexPath.row]);
            [pasteBoard setData:capturedImageData forPasteboardType:(NSString *)kUTTypePNG];
        }
    }

在我的情况下，我只允许复制功能在我的CollectionView中，如果按下副本，我正在将单元格内的图像复制到PasteBoard。

In my case, I'm allowing only Copy feature in my CollectionView, and if the copy is pressed, I'm copying the image that is inside the cell to the PasteBoard.

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