从UIScrollView Objective C创建PDF

这个问题之前已经发布过(从iphone应用程序中的UIScrollView创建PDF),我正在使用的代码来自这里.

这是代码

-(void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
    // Creates a mutable data object for updating with binary data, like a byte array
    NSMutableData *pdfData = [NSMutableData data];

    // Points the pdf converter to the mutable data object and to the UIView to be converted
    UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
    UIGraphicsBeginPDFPage();
    CGContextRef pdfContext = UIGraphicsGetCurrentContext();


    // draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData

    [aView.layer renderInContext:pdfContext];

    // remove PDF rendering context
    UIGraphicsEndPDFContext();

    // Retrieves the document directories from the iOS device
    NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);

    NSString* documentDirectory = [documentDirectories objectAtIndex:0];
    documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];

    // instructs the mutable data object to write its context to a file on disk
    [pdfData writeToFile:documentDirectoryFilename atomically:YES];
}

设置:我有一个UIScrollView,里面是一个UIView.我想保存整个UIView(950,500px),并且它位于(520,500)的空间(UIScrollView大小)中.生成的PDF只是UIScrollView(520,500)的大小

我读了答案,但他显然改变了代码,但它对我不起作用.我一直在努力解决这个问题.

我是初学者,所以请指出我应该添加到我错过的问题中的任何内容.谢谢.

PS - 这是一个iPad应用程序.