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如何从 UIImage 制作 Pdf？

发布于 2024-12-26 11:21:29 字数 81 浏览 1 评论 0原文

我的 UIViewController 中有一个 UIImage，我想将该图像迁移到 PDF 格式，那么这种迁移是否可能？请指导我，我对此一无所知。

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傾城如夢未必闌珊 2025-01-02 11:21:29

如果你有 UIImageView 到 UIViewController 然后调用这个方法：

-(NSData*)makePDFfromView:(UIView*)view
{
    NSMutableData *pdfData = [NSMutableData data];

    UIGraphicsBeginPDFContextToData(pdfData, view.bounds, nil);
    UIGraphicsBeginPDFPage();
    CGContextRef pdfContext = UIGraphicsGetCurrentContext();
    [view.layer renderInContext:pdfContext];
    UIGraphicsEndPDFContext();

    return pdfData;
}

像这样使用：

NSData *pdfData = [self makePDFfromView:imgView];
//[pdfData writeToFile:@"myPdf.pdf" atomically:YES]; - save it to a file

If you have UIImageView into UIViewController then call this method:

-(NSData*)makePDFfromView:(UIView*)view
{
    NSMutableData *pdfData = [NSMutableData data];

    UIGraphicsBeginPDFContextToData(pdfData, view.bounds, nil);
    UIGraphicsBeginPDFPage();
    CGContextRef pdfContext = UIGraphicsGetCurrentContext();
    [view.layer renderInContext:pdfContext];
    UIGraphicsEndPDFContext();

    return pdfData;
}

Use like this:

NSData *pdfData = [self makePDFfromView:imgView];
//[pdfData writeToFile:@"myPdf.pdf" atomically:YES]; - save it to a file

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无风消散 2025-01-02 11:21:29

这并不难，但需要几个步骤来设置所有内容。基本上，您需要创建一个 PDF 图形上下文，然后使用标准绘图命令在其中进行绘制。要简单地将 UIImage 放入 PDF 中，您可以执行如下操作：

// assume this exists and is in some writable place, like Documents
NSString* pdfFilename = /* some pathname */

// Create the PDF context
UIGraphicsBeginPDFContextToFile(pdfFilename, CGRectZero, nil); // default page size
UIGraphicsBeginPDFPageWithInfo(CGRectZero, nil);

// Draw the UIImage -- I think PDF contexts are flipped, so you may have to
// set a transform -- see the documentation link below if your image draws
// upside down
[theImage drawAtPoint:CGPointZero];

// Ending the context will automatically save the PDF file to the filename
UIGraphicsEndPDFContext();

有关详细信息，请参阅 iOS 绘图和打印指南。

It's not very hard, but there are a few steps to set everything up. Basically, you need to create a PDF graphics context, and then draw into it with standard drawing commands. To simply put an UIImage into a PDF, you could do something like the following:

// assume this exists and is in some writable place, like Documents
NSString* pdfFilename = /* some pathname */

// Create the PDF context
UIGraphicsBeginPDFContextToFile(pdfFilename, CGRectZero, nil); // default page size
UIGraphicsBeginPDFPageWithInfo(CGRectZero, nil);

// Draw the UIImage -- I think PDF contexts are flipped, so you may have to
// set a transform -- see the documentation link below if your image draws
// upside down
[theImage drawAtPoint:CGPointZero];

// Ending the context will automatically save the PDF file to the filename
UIGraphicsEndPDFContext();

For more information, see the Drawing and Printing Guide for iOS.

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