如何将PDF转换为图像？

Question

是否有将PDF文档（或至少PDF文档的第一页）转换为图像的原生方式？

Answer 1

使用ImageIO.framework，您可以执行以下操作：

CGImageSourceRef src = CGImageSourceCreateWithURL(PDF_URL, NULL);
NSDictionary* options = [NSDictionary dictionaryWithObject:(id)[NSNumber numberWithInt:500] forKey:(id)kCGImageSourceThumbnailMaxPixelSize];
CGImageRef firstPage = CGImageSourceCreateImageAtIndex(src, 0, options); // 0 first page of the pdf
CFRelease(src);
UIImage* img = [UIImage imageWithCGImage:firstPage];
CGImageRelease(firstPage);