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我试图通过将 UIView 中绘制的签名提取到我的 pdf 文件来签署我的多页 pdf 文件，但我面临的问题是，在签署 pdf 后，签名与 pdf 文件中的所有页面集成在一起 pdf文件以 pdf 文件的形式显示在单页中。（例如，如果 pdf 文件中有 8 页，则所有 8 页与签名一起显示为单页）。集成签名的pdf文件的输出如下

代码的输出

用于从文档目录中获取图像并与 pdf 文件集成的代码是，

- (void)viewWillAppear:(BOOL)animated
{
[webView reload];

UIWebView *webView;
webView= [[UIWebView alloc] initWithFrame:CGRectMake(0,44, 320, 460)];

NSString *path1;
path1 = [[NSBundle mainBundle] pathForResource:@"typo_tips" ofType:@"pdf"];

NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,
                                                 NSUserDomainMask, YES);

NSString *documentDirectoryPath;
NSURL *targetURL;

documentDirectoryPath  = [[paths objectAtIndex:0]              stringByAppendingPathComponent:@"typo_tips.pdf"];

[fileManager copyItemAtPath:path1 toPath:documentDirectoryPath error:&error];

NSLog(@"path1 value is %@ \n",path1);
NSLog(@"docu dir path is %@ \n",documentDirectoryPath);



if (entered==1)//"entered==1", after save button clicked in signviewcontroller 
{
targetURL = [NSURL fileURLWithPath:documentDirectoryPath];


}
else     targetURL = [NSURL fileURLWithPath:path1];


 if (entered==1)
{


CFURLRef url;
url = (CFURLRef)CFBridgingRetain([NSURL fileURLWithPath:documentDirectoryPath]);
CGPDFDocumentRef myDocument;
myDocument = CGPDFDocumentCreateWithURL(url);

// Create PDF context
CGContextRef pdfContext = CGPDFContextCreateWithURL(url, NULL, NULL);     //(CFURLRef)outputURL
CGPDFContextBeginPage(pdfContext, NULL);
UIGraphicsPushContext(pdfContext);

int totalPages = (int)CGPDFDocumentGetNumberOfPages(myDocument);
NSLog(@"no. of pages in pdf is %d \n",totalPages);

for (int currentPage = 0; currentPage < totalPages; currentPage++)
{

CGContextDrawPDFPage(UIGraphicsGetCurrentContext(), CGPDFDocumentGetPage(myDocument, page));
//"page" is current pdf page to be signed

    if (page == currentPage)
    {

    NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image.png"];// "image.png" is the saved user's signature in document directory

    image = [[UIImage alloc] initWithContentsOfFile:filePath];
    CGRect imageRect = CGRectMake(50, 50, image.size.width, image.size.height);

    CGContextDrawImage(UIGraphicsGetCurrentContext(), imageRect, image.CGImage);
    }

}


// Clean up
UIGraphicsPopContext();
CGPDFContextEndPage(pdfContext);
CGPDFContextClose(pdfContext);

}

NSURLRequest *request = [NSURLRequest requestWithURL:targetURL];
[webView loadRequest:request];
[self.view addSubview:webView];
}

谁能帮助我，如何将pdf页面与集成的电子签名一起单独显示。

4

2 回答 2

1

试试这个：

// Create PDF context
CGContextRef pdfContext = CGPDFContextCreateWithURL(url, NULL, NULL);     //(CFURLRef)outputURL

int totalPages = (int)CGPDFDocumentGetNumberOfPages(myDocument);
NSLog(@"no. of pages in pdf is %d \n",totalPages);

for (int currentPage = 0; currentPage < totalPages; currentPage++)
{
    CGPDFContextBeginPage(pdfContext, NULL);
    UIGraphicsPushContext(pdfContext);

    CGContextDrawPDFPage(UIGraphicsGetCurrentContext(), 
        CGPDFDocumentGetPage(myDocument, page));
    //"page" is current pdf page to be signed

    if (page == currentPage)
    {
        NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image.png"];

        image = [[UIImage alloc] initWithContentsOfFile:filePath];
        CGRect imageRect = CGRectMake(50, 50, image.size.width, image.size.height);

        CGContextDrawImage(UIGraphicsGetCurrentContext(), imageRect, image.CGImage);
    }

    // Clean up
    UIGraphicsPopContext();
    CGPDFContextEndPage(pdfContext);
}

CGPDFContextClose(pdfContext);

在您的 for 循环中，您必须为源文件中的每个页面创建一个新的 PDF 页面。我在 for 循环中移动了这些行：

    CGPDFContextBeginPage(pdfContext, NULL);
    UIGraphicsPushContext(pdfContext);

以及相应的清理代码。

于 2013-11-14T10:04:32.680 回答
0

您正在使用 webview 来显示它 Reader，它使用 iOS 内置的 PDF 阅读类。

https://github.com/vfr/Reader

如果做不到这一点，请尝试调整 UIWebview 上的缩放级别。不幸的是，UIWebview 的选项有限，因为它只是一个 Web 容器。

于 2013-11-14T08:21:25.713 回答