在iphone中创建pdf缩略图 [英] Creating pdf Thumbnail in iphone

问题描述

我是Objective-c iPhone编程的新手。我有一个应用程序，我在我的UIWebView中成功显示PDF，但现在我想创建我的PDF的缩略图。我的PDF存储在我的资源文件夹中。

I am new to Objective-c iPhone programming. I have an application in which I display a PDF in my UIWebView successfully, but now I want to create a thumbnail of my PDF. My PDF is stored in my resource folder.

所以请给我一些代码，说明如何显示我的PDF缩略图。我的代码用于显示PDF是按钮功能：

So please give me code for how I can show a thumbnail of my PDF. My code is for displaying PDF is which is taken in button function:

-(void)show:(id)sender {

    pdfView.autoresizesSubviews = NO;
    pdfView.scalesPageToFit=YES;
    pdfView.autoresizingMask=(UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth);
    [pdfView setDelegate:self];

    NSString *path = [[NSBundle mainBundle] pathForResource:@"com" ofType:@"pdf"];
    NSLog(@"Path of res is%@",path);
    NSURL *url = [NSURL fileURLWithPath:path];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [pdfView loadRequest:request];
}

推荐答案

尝试以下方法：

- (UIImage *)imageFromPDFWithDocumentRef:(CGPDFDocumentRef)documentRef {
    CGPDFPageRef pageRef = CGPDFDocumentGetPage(documentRef, 1);
    CGRect pageRect = CGPDFPageGetBoxRect(pageRef, kCGPDFCropBox);

    UIGraphicsBeginImageContext(pageRect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextTranslateCTM(context, CGRectGetMinX(pageRect),CGRectGetMaxY(pageRect));
    CGContextScaleCTM(context, 1, -1);  
    CGContextTranslateCTM(context, -(pageRect.origin.x), -(pageRect.origin.y));
    CGContextDrawPDFPage(context, pageRef);

    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return finalImage;
} 

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