如何在iOS内将UIView转换为PDF?
关于如何在应用程序的如何在iOS内将UIView转换为PDF?,ios,pdf,uiview,uiimage,core-graphics,Ios,Pdf,Uiview,Uiimage,Core Graphics,关于如何在应用程序的UIView中显示PDF,有很多参考资料。我现在正在做的是从UIViews创建一个PDF 例如,我有一个UIView,它的子视图有文本视图、UILabels、UIImages,那么如何将一个大的UIView作为一个整体,包括它的所有子视图和子视图转换成PDF 我查过了。但是,它只涉及将文本/图像片段写入PDF文件 我面临的问题是,我想要以PDF格式写入文件的内容很多。如果我把它们一块一块地写进PDF,那将是一项艰巨的工作。 这就是为什么我在寻找一种将UIViews写入PDF甚
UIView
中显示PDF,有很多参考资料。我现在正在做的是从UIViews
创建一个PDF
例如,我有一个UIView
,它的子视图有文本视图、UILabels
、UIImages
,那么如何将一个大的UIView
作为一个整体,包括它的所有子视图和子视图转换成PDF
我查过了。但是,它只涉及将文本/图像片段写入PDF文件
我面临的问题是,我想要以PDF格式写入文件的内容很多。如果我把它们一块一块地写进PDF,那将是一项艰巨的工作。
这就是为什么我在寻找一种将UIViews
写入PDF甚至位图的方法
我已经在堆栈溢出中尝试了从其他Q/A复制的源代码。但它只给我一个空白的PDF,大小为UIView
bounds
-(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();
// draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData
[aView drawRect:aView.bounds];
// 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);
}
请注意,以下方法仅创建视图的位图;它不会创建实际的排版
(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);
}
另外,请确保导入:
QuartzCore/QuartzCore.h我不知道为什么,但casilic的回答在iOS6.1上给了我一个空白屏幕。下面的代码可以工作
-(NSMutableData *)createPDFDatafromUIView:(UIView*)aView
{
// 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();
return pdfData;
}
-(NSString*)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
// Creates a mutable data object for updating with binary data, like a byte array
NSMutableData *pdfData = [self createPDFDatafromUIView:aView];
// 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);
return documentDirectoryFilename;
}
如果有人感兴趣,以下是Swift 2.1代码:
func createPdfFromView(aView: UIView, saveToDocumentsWithFileName fileName: String)
{
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil)
UIGraphicsBeginPDFPage()
guard let pdfContext = UIGraphicsGetCurrentContext() else { return }
aView.layer.renderInContext(pdfContext)
UIGraphicsEndPDFContext()
if let documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first {
let documentsFileName = documentDirectories + "/" + fileName
debugPrint(documentsFileName)
pdfData.writeToFile(documentsFileName, atomically: true)
}
}
此外,如果有人感兴趣,以下是Swift 3代码:
func createPdfFromView(aView: UIView, saveToDocumentsWithFileName fileName: String)
{
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil)
UIGraphicsBeginPDFPage()
guard let pdfContext = UIGraphicsGetCurrentContext() else { return }
aView.layer.render(in: pdfContext)
UIGraphicsEndPDFContext()
if let documentDirectories = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first {
let documentsFileName = documentDirectories + "/" + fileName
debugPrint(documentsFileName)
pdfData.write(toFile: documentsFileName, atomically: true)
}
}
这将从UIView生成PDF,并打开打印对话框objective C。 将
-(iAction)PrintPDF:(id)发送者
附加到屏幕上的按钮上。
添加#导入框架
H文件
@interface YourViewController : UIViewController <MFMailComposeViewControllerDelegate,UIPrintInteractionControllerDelegate>
{
UIPrintInteractionController *printController;
}
- (IBAction)PrintPDF:(id)sender;
从UIView创建PDF的一种超级简单的方法是使用UIView扩展
Swift 4.2
extension UIView {
// Export pdf from Save pdf in drectory and return pdf file path
func exportAsPdfFromView() -> String {
let pdfPageFrame = self.bounds
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, pdfPageFrame, nil)
UIGraphicsBeginPDFPageWithInfo(pdfPageFrame, nil)
guard let pdfContext = UIGraphicsGetCurrentContext() else { return "" }
self.layer.render(in: pdfContext)
UIGraphicsEndPDFContext()
return self.saveViewPdf(data: pdfData)
}
// Save pdf file in document directory
func saveViewPdf(data: NSMutableData) -> String {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let docDirectoryPath = paths[0]
let pdfPath = docDirectoryPath.appendingPathComponent("viewPdf.pdf")
if data.write(to: pdfPath, atomically: true) {
return pdfPath.path
} else {
return ""
}
}
}
信用证:使用Swift 5/iOS 12,您可以将CALayer
的方法与UIGraphicsPFrenderer
的方法相结合,以便从UIView
实例创建PDF文件
下面的示例代码显示了如何使用render(in:)
和writePDF(to:withActions:)
:
注意:为了在您的游乐场中使用,您首先需要在macOS“文档”文件夹中创建一个名为“共享游乐场数据”的文件夹
下面的UIViewController
子类complete implementation显示了一种重构iOS应用程序前面示例的可能方法:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
view.backgroundColor = .orange
let subView = UIView(frame: CGRect(x: 20, y: 20, width: 40, height: 60))
subView.backgroundColor = .magenta
view.addSubview(subView)
createPDF(from: view)
}
func createPDF(from view: UIView) {
let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let outputFileURL = documentDirectory.appendingPathComponent("MyPDF.pdf")
print("URL:", outputFileURL) // When running on simulator, use the given path to retrieve the PDF file
let pdfRenderer = UIGraphicsPDFRenderer(bounds: view.bounds)
do {
try pdfRenderer.writePDF(to: outputFileURL, withActions: { context in
context.beginPage()
view.layer.render(in: context.cgContext)
})
} catch {
print("Could not create PDF file: \(error)")
}
}
}
+在找到这个简单的解决方案之前,我浏览了好几篇关于pdf生成的文章。我也想做同样的事情,你的方法似乎很好,但质量很低。我错过了什么吗?我怀疑质量很低,因为它采用UIView并将其转换为光栅,而其他渲染文本和图像的方法直接将它们作为矢量保存在PDF文件中。我遵循此方法,但生成的是一个空白PDF。有人能帮我吗?真是太棒了!!!干杯我唯一的问题是,它只在一个页面中生成PDF。我怎样才能把页面分开,而不是有一个很长的PDF文件?!这与我刚才用两种不同的方法给出的答案完全相同????你认为这是如何解决你的黑屏问题时,它是相同的代码??我有同样的经验。从第一个代码中获取一个空白PDF。像亚历克斯那样一分为二,成功了。无法解释原因。您的guard语句意味着未调用UIGraphicsSendPdfContext()-可能会提前添加延迟?@DavidH谢谢,David,好主意!此外,我认为,有一个好主意,为警卫返回案例添加一个完成块类完成:(success:Bool)->()
。昨天,我发布了一个问答,介绍了如何通过在大图像中渲染视图,然后感兴趣地将图像绘制成PDF来生成高分辨率图像:这只为第一页创建PDF!scrollview呢?好问题!然而,我不是该问的人。也许开始另一个问题?我有同样的问题,然后@SaurabhPrajapati和我创建了一个感谢它工作,一个问题,所以我有长滚动视图,但PDF文件只显示了它的一部分,所以有没有办法调整代码,例如给它高度?@HusseinElbeheiry只使用contentView生成PDF。当我创建一个scrollView(UIScrollView)时,我肯定会创建一个contentView(UIView)并将contentView放在scrollView中,然后我会将所有后续元素添加到contentView中。在这种情况下,使用contentView创建PDF文档就足够了。contentView.ExportAsPDFromView
import UIKit
import PlaygroundSupport
let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
view.backgroundColor = .orange
let subView = UIView(frame: CGRect(x: 20, y: 20, width: 40, height: 60))
subView.backgroundColor = .magenta
view.addSubview(subView)
let outputFileURL = PlaygroundSupport.playgroundSharedDataDirectory.appendingPathComponent("MyPDF.pdf")
let pdfRenderer = UIGraphicsPDFRenderer(bounds: view.bounds)
do {
try pdfRenderer.writePDF(to: outputFileURL, withActions: { context in
context.beginPage()
view.layer.render(in: context.cgContext)
})
} catch {
print("Could not create PDF file: \(error)")
}
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
view.backgroundColor = .orange
let subView = UIView(frame: CGRect(x: 20, y: 20, width: 40, height: 60))
subView.backgroundColor = .magenta
view.addSubview(subView)
createPDF(from: view)
}
func createPDF(from view: UIView) {
let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let outputFileURL = documentDirectory.appendingPathComponent("MyPDF.pdf")
print("URL:", outputFileURL) // When running on simulator, use the given path to retrieve the PDF file
let pdfRenderer = UIGraphicsPDFRenderer(bounds: view.bounds)
do {
try pdfRenderer.writePDF(to: outputFileURL, withActions: { context in
context.beginPage()
view.layer.render(in: context.cgContext)
})
} catch {
print("Could not create PDF file: \(error)")
}
}
}