如何将PDF转换为图像？

Question

是否有本地方式将PDF文档（或至少PDF文档的第一页）转换为图像？

Answer 1

使用ImageIO.framework你可以做这样的事情：

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);