Question

我正在使用UIGraphicsBeginImageContext捕获屏幕，但图像质量不佳。任何人都可以帮助我如何将UICollectionViewCell保存为高质量图像，以及如何在选择单元格时获取动态单元格的大小。

Answer 1

CollectionView委托方法会在选中单元格后获取单元格，单元格图像将保存到项目文档目录中。

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];

    UIGraphicsBeginImageContext(cell.bounds.size);

    [cell.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"New ImageFolder"];

    NSError *error = nil;
    if (![[NSFileManager defaultManager] fileExistsAtPath:stringPath])
        [[NSFileManager defaultManager] createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:&error];

    NSString *fileName = [stringPath stringByAppendingFormat:@"/image.jpg"];
    NSData *data = UIImageJPEGRepresentation(newImage, 1.0);
    [data writeToFile:fileName atomically:YES];

}

使用UIGraphicsBeginImageContext将UICollectionViewCell保存为图像

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