Question

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面pdf文件，但我面临的问题是，在签署pdf之后，签名与pdf文件集成了所有页面在pdf文件中，作为pdf文件显示在单个页面中。（例如，如果pdf文件中有8个页面，那么所有8个页面将与签名一起显示为单个页面）。集成了签名的pdf文件的输出如下所示

output of the code

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];
}

任何人都可以帮助我，如何单独显示pdf页面以及集成的电子签名。

Answer 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。

Answer 2

您正在使用webview来显示使用iOS内置PDF阅读课程的Reader。

https://github.com/vfr/Reader

如果失败，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。

电子签到pdf文件，将多页pdf制作成具有相同内容的单页

2 个答案: