使用CoreGraphics框架是枯燥的工作,在我诚实的看来,当涉及到以编程方式绘制PDF文件。iOS SDK - 以编程方式生成一个PDF文件
我想以编程方式创建一个PDF,在我的应用程序中使用视图中的各种对象。
我很想知道是否有任何有关iOS SDK的优秀PDF教程,也许是库中的一个下拉菜单。
我见过这个教程,PDF Creation Tutorial,但它主要是用C编写的。寻找更多的Objective-C风格。这也似乎是写入PDF文件的一种荒谬的方式,不得不计算线路和其他对象的放置位置。
void CreatePDFFile (CGRect pageRect, const char *filename)
{
// This code block sets up our PDF Context so that we can draw to it
CGContextRef pdfContext;
CFStringRef path;
CFURLRef url;
CFMutableDictionaryRef myDictionary = NULL;
// Create a CFString from the filename we provide to this method when we call it
path = CFStringCreateWithCString (NULL, filename,
kCFStringEncodingUTF8);
// Create a CFURL using the CFString we just defined
url = CFURLCreateWithFileSystemPath (NULL, path,
kCFURLPOSIXPathStyle, 0);
CFRelease (path);
// This dictionary contains extra options mostly for 'signing' the PDF
myDictionary = CFDictionaryCreateMutable(NULL, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
CFDictionarySetValue(myDictionary, kCGPDFContextTitle, CFSTR("My PDF File"));
CFDictionarySetValue(myDictionary, kCGPDFContextCreator, CFSTR("My Name"));
// Create our PDF Context with the CFURL, the CGRect we provide, and the above defined dictionary
pdfContext = CGPDFContextCreateWithURL (url, &pageRect, myDictionary);
// Cleanup our mess
CFRelease(myDictionary);
CFRelease(url);
// Done creating our PDF Context, now it's time to draw to it
// Starts our first page
CGContextBeginPage (pdfContext, &pageRect);
// Draws a black rectangle around the page inset by 50 on all sides
CGContextStrokeRect(pdfContext, CGRectMake(50, 50, pageRect.size.width - 100, pageRect.size.height - 100));
// This code block will create an image that we then draw to the page
const char *picture = "Picture";
CGImageRef image;
CGDataProviderRef provider;
CFStringRef picturePath;
CFURLRef pictureURL;
picturePath = CFStringCreateWithCString (NULL, picture,
kCFStringEncodingUTF8);
pictureURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), picturePath, CFSTR("png"), NULL);
CFRelease(picturePath);
provider = CGDataProviderCreateWithURL (pictureURL);
CFRelease (pictureURL);
image = CGImageCreateWithPNGDataProvider (provider, NULL, true, kCGRenderingIntentDefault);
CGDataProviderRelease (provider);
CGContextDrawImage (pdfContext, CGRectMake(200, 200, 207, 385),image);
CGImageRelease (image);
// End image code
// Adding some text on top of the image we just added
CGContextSelectFont (pdfContext, "Helvetica", 16, kCGEncodingMacRoman);
CGContextSetTextDrawingMode (pdfContext, kCGTextFill);
CGContextSetRGBFillColor (pdfContext, 0, 0, 0, 1);
const char *text = "Hello World!";
CGContextShowTextAtPoint (pdfContext, 260, 390, text, strlen(text));
// End text
// We are done drawing to this page, let's end it
// We could add as many pages as we wanted using CGContextBeginPage/CGContextEndPage
CGContextEndPage (pdfContext);
// We are done with our context now, so we release it
CGContextRelease (pdfContext);
}
编辑:这里是在iPhone项目上GitHub using libHaru一个例子。
哈哈已记录得很好,我知道这是旧的,但在iPhone上100页的PDF是什么。它会比iOS设备更强调服务器,因为服务器将不得不乘以尝试这样做的并发用户的数量。 – Armand 2015-09-26 21:10:57