Question

我遇到了UICollectionView的问题，我认为我已经缩小到以下几个方面。问题是，当我在UICollectionView上调用重新加载时，会出现一个闪烁，加载1个图像，然后加载正确的图像。几乎就像当您滚动新单元格并更新它们但没有任何滚动时。

现在我用普通的

测试了它

sampleImage.image = [UIImage imageNamed:@"LogoHome"];

我没有任何闪烁，所以我把它缩小到以下代码

[self.imageManager requestImageForAsset:[self.arrayPhotoAssets objectAtIndex:indexPath.row]
                                 targetSize:CGSizeMake(imageWidth, imageHeight)
                                contentMode:PHImageContentModeAspectFill
                                    options:nil resultHandler:^(UIImage *result, NSDictionary* info){

                                        UIImageView *sampleImage = (UIImageView *)[cell viewWithTag:1];
                                        sampleImage.image = result;

                                    }];

位于

之内

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

有什么方法可以调整代码以防止上述情况发生？以下是完整的代码段：

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

////// GALLERY COLLECTION VIEW


if(collectionView.tag == 1){

    static NSString *cellIdentifier = @"galleryCell";

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];

    float imageWidth = 77;
    float imageHeight = 77;

    UIScreen *mainScreen = [UIScreen mainScreen];

    //NSLog(@"%f",mainScreen.bounds.size.width);

    // IPHONE 6

    if(mainScreen.bounds.size.width == 375){

        imageWidth = 92;
        imageHeight = 92;

    }

    // IPHONE 6 PLUS

    if(mainScreen.bounds.size.width == 414){

        imageWidth = 102;
        imageHeight = 102;

    }


    [self.imageManager requestImageForAsset:[self.arrayPhotoAssets objectAtIndex:indexPath.row]
                                 targetSize:CGSizeMake(imageWidth, imageHeight)
                                contentMode:PHImageContentModeAspectFill
                                    options:nil resultHandler:^(UIImage *result, NSDictionary* info){

                                        UIImageView *sampleImage = (UIImageView *)[cell viewWithTag:1];
                                        sampleImage.image = result;

                                    }];

    return cell;

}


UICollectionViewCell *cell;

return cell;

}

Answer 1

我建议您在尝试拨打sampleImage.image = nil之前设置requestImageForAsset。这将清除您的图像视图，以消除闪烁。

UIImageView *sampleImage = (UIImageView *)[cell viewWithTag:1];
sampleImage.image = nil;

[self.imageManager requestImageForAsset:[self.arrayPhotoAssets objectAtIndex:indexPath.row]
                                 targetSize:CGSizeMake(imageWidth, imageHeight)
                                contentMode:PHImageContentModeAspectFill
                                    options:nil resultHandler:^(UIImage *result, NSDictionary* info){

                                        sampleImage.image = result;
                             }];

Answer 2

设置＆＃34; isSynchronous＆＃34;传递给requestImage（PHImageRequestOptions）的选项中的true为我修复了闪烁。

重新加载和调用requestImageForAsset时，UICollectionView闪烁

2 个答案: