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我有创建饼图的 iphone 应用程序，我希望该图表应保存在 iphone 的 pdf 文件中。

以下是 PieChart 的代码，但我如何将其保存为 pdf 我已阅读我们可以将文本保存为 pdf 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，用于使用二进制数据进行更新，例如字节数组

  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();

// 将矩形绘制到视图中，因此这由 UIGraphicsBeginPDFContextToData 捕获

   [aView.layer renderInContext:pdfContext];

// 移除 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);
 }
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2 回答 2

1

您要在该视图中创建为 pdf 的视图执行以下更改

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，您将找到包含与您传入的视图相同内容的 pdf 文档

块引用

[self createPDFfromUIView: self.view saveToDocumentsWithFileName:fileName]

块引用

这个方法调用。这段代码运行良好感谢安东尼奥

于 2012-04-20T11:08:06.163 回答
0

取自这里：

如何在 iOS 中将 UIView 转换为 PDF？

(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);
}
于 2012-04-20T09:06:58.533 回答