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我正在尝试使用具有注释（如小部件和链接）的代码生成PDF。我可以生成PDF并修改文档信息和页面的MediaBox，但是我不知道如何添加到注释中。我尝试将其添加到页面字典中，但是由于某种原因，PDF不接受它。

有人知道如何将注释添加到新创建的PDF吗？以下是我要生成的PDF和要添加的测试注释词典的代码：

-(void) createPDFFile: (CGPDFPageRef) pageRef{

CGContextRef pdfContext;

CFStringRef path;

CFURLRef url;


CFMutableDictionaryRef myDictionary = NULL;

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
 NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
 const char *filepath = [[documentsDirectory stringByAppendingString:@"/fileTest.pdf"] UTF8String];

path = CFStringCreateWithCString (NULL, filepath, kCFStringEncodingUTF8);

url = CFURLCreateWithFileSystemPath (NULL, path,  kCFURLPOSIXPathStyle, 0);

CFRelease (path);

myDictionary = CFDictionaryCreateMutable(NULL, 0,

                                         &kCFTypeDictionaryKeyCallBacks,

                                         &kCFTypeDictionaryValueCallBacks); 

CFDictionarySetValue(myDictionary, kCGPDFContextTitle, CFSTR("My PDF File"));

CFDictionarySetValue(myDictionary, kCGPDFContextCreator, CFSTR("My Name"));

CGRect pageRect = self.bounds;
pdfContext = CGPDFContextCreateWithURL (url, &pageRect, myDictionary); // 5 …