如何在iphone应用程序中以pdf文件保存饼图

我有一个iphone应用程序，它创建了一个饼图，我想这个饼图应该保存在iphone的pdf文件中

下面是PieChart的代码，但我如何将其保存在pdf中我已经读到，我们可以将文本保存在pdf中，但如何保存

   -(void)createGraph{

  PieClass *myPieClass=[[PieClass alloc]initWithFrame:CGRectMake(400,40, 320, 230)];


  myPieClass.itemArray=[[NSArray alloc]initWithObjects:textFieldOne.text,textFieldTwo.text,textFieldThree.text, nil];

 myPieClass.myColorArray=[[NSArray alloc]initWithObjects:[UIColor purpleColor],[UIColor redColor],[UIColor orangeColor], nil];

 myPieClass.radius=100;
 [self.view addSubview:myPieClass];

  [self creatPDFFromView:@"mydata.pdf"];

 }

    -(void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename


     {

//创建一个可变数据对象，以便使用二进制数据（如字节数组）进行更新

  NSMutableData *pdfData = [NSMutableData data];

//将pdf转换器指向可变数据对象和要转换的UIView

 UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
 UIGraphicsBeginPDFPage();
 CGContextRef pdfContext = UIGraphicsGetCurrentContext();

//将rect绘制到视图中，因此UIGraphicsBeginPDFContextToData将捕获该数据

   [aView.layer renderInContext:pdfContext];

//删除PDF渲染上下文

    UIGraphicsEndPDFContext();

//从iOS设备检索文档目录

   NSArray* documentDirectories =   NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);

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

//指示可变数据对象将其上下文写入磁盘上的文件

 [pdfData writeToFile:documentDirectoryFilename atomically:YES];
 NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);
 }

从这里开始：

---

要在该视图中创建为pdf的视图，请执行以下更改

NSString *fileName=@"PdfFromView.pdf";
[self createPDFfromUIView:self.view saveToDocumentsWithFileName:fileName];


-(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];
NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];

// instructs the mutable data object to write its context to a file on disk
[pdfData writeToFile:documentDirectoryFilename atomically:YES];
NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);

}

执行此代码后，转到“文档”文件夹，您将发现pdf文档包含与您传入的视图相同的内容

大宗报价

[self-createPDFfromUIView:self.viewsaveToDocumentsWithFileName:fileName]

大宗报价

此方法调用。

---

多亏Antonio，这段代码工作正常。[如何在iOS内将UIView转换为PDF？][1][1]：以及如何为此文件指定文件名，我可以称此方法为[self-CreatePdfFromView:fileName]；这只是一个示例，复制代码并使用它做您想做的事情，但是如果您想将其用作一种方法，可以这样调用它，例如：[self-CreatePdfFromView:@“myFile.pdf”]；如果您有空，我们可以在此聊天以讨论此解决方案吗？我已经尝试过此方法，但由于您的给定代码与我的实现一起出现异常。此代码工作正常，但在pdf文件中看不到我的数据代码正常，但在我的pdf文件中没有看到任何数据UITextView*textView=[[UITextView alloc]initWithFrame:CGRectMake（0，0320250）]; text=@“这是textView内容”；[self.view addSubview:textView]；NSString*fileName=@“PdfFromView.pdf”；[self-createPDFfromUIView:self.view saveToDocumentsWithFileName:fileName]；现在，您发现textview内容位于pdf文档中

NSString *fileName=@"PdfFromView.pdf";
[self createPDFfromUIView:self.view saveToDocumentsWithFileName:fileName];


-(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];
NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];

// instructs the mutable data object to write its context to a file on disk
[pdfData writeToFile:documentDirectoryFilename atomically:YES];
NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);