Introduction

ComPDFKit PDF SDK for iOS is a robust PDF library for developers who need to develop applications on iOS, which offers powerful Objective-C APIs for quickly viewing, annotating, editing, and creating PDFs. It is feature-rich and battle-tested, making PDF files process and manipulation easier and faster for iOS devices.

ComPDFKit API allows you to get 1000 files processing monthly now! Just sign up for a free trial and enjoy comprehensive PDF functions.

Related

• ComPDFKit PDF Library for Android
• ComPDFKit PDF SDK - Flutter Library
• ComPDFKit PDF SDK - React Native Library
• How to Build an iOS PDF Viewer or Editor in Objective-C
• How to Build an iOS PDF Viewer or Editor in Swift

Get Started

It is easy to embed ComPDFKit in your iOS app with a few lines of Objective-C code. Take just a few minutes and get started.

The following sections introduce the structure of the installation package, how to run a demo, and how to make an iOS app in Objective-C with ComPDFKit iOS PDF SDK.

Requirements

ComPDFKit PDF SDK for iOS requires the latest stable version of Xcode available at the time the release was made. This is a hard requirement, as each version of Xcode is bundled with a specific version of the iOS Base SDK, which often defines how UIKit and various other frameworks behave.

• iOS 10.0 or higher.
• Xcode 13.0 or newer for Objective-C or Swift.

How to Run a Demo

ComPDFKit PDF SDK for iOS provides multiple demos in Objective-C for developers to learn how to call the SDK on iOS. You can find them in the "Examples/Objective-C" folder.

In this guide, we take "PDFViewer" as an example to show how to run it in Xcode (The demo in Objective-C uses the "xcodeproj" method, so you can directly open "PDFViewer.xcodeproj").

1. Copy the applied "license_key_ios.xml" file to "Examples" folder to replace (There is already a method to parse the xml file in demo, please do not modify the storage location and file name).

2. Find "PDFViewer.xcodeproj" in the "Examples/Objective-C" folder and double-click to open it, find the schemes of "PDFViewer" in Xcode, and select the corresponding simulator (ComPDFKit does not support the simulator to run M1 chip, but we have made it compatible in Excluded Architectures, you can see the processing method in Troubleshooting.

   

3. Click Product -> Run to run the demo on an iOS device. In this guide, we use an iPhone 14 device as an example. After building the demo successfully, the "PDF32000_2008.pdf" file will be opened and displayed.

   

Note: This is a demo project, presenting completed ComPDFKit PDF SDK functions. The functions might be different based on the license you have purchased. Please check that the functions you choose work fine in this demo project.

How to Make an iOS App in Objective-C with ComPDFKit

This section will help you to quickly get started with ComPDFKit PDF SDK to make an iOS app in Objective-C with step-by-step instructions, which include the following steps:

• Create a new iOS project in Objective-C.
• Integrate ComPDFKit into your apps.
• Apply the license key.
• Display a PDF document.

Create a New iOS Project in Objective-C

In this guide, we use Xcode 12.4 to create a new iOS project.

1. Fire up Xcode, choose File -> New -> Project..., and then select iOS -> Single View Application. Click Next.

2. Choose the options for your new project. Please make sure to choose Objective-C as the programming language. Then, click Next.

3. Place the project to the location as desired. Then, click Create.

Integrate ComPDFKit into Your Apps

To add the dynamic xcframework "ComPDFKit.xcframework" into the "PDFViewer" project, please follow the steps below:

1. Right-click the "PDFViewer" project, select Add Files to "PDFViewer"....

   

2. Find and choose "ComPDFKit.xcframework" in the download package, and then click Add.

   Note: Make sure to check the Copy items if needed option.

   

3. Then, the "PDFViewer" project will look like the following picture.

   

4. Add the dynamic xcframework "ComPDFKit.xcframework" to the Xcode's Embedded Binaries. Left-click the project, find Embedded Binaries in the General tab, and choose Embed & Sign.

   

5. For earlier versions of Xcode (like Xcode 13), the Bitcode option might be turned on by default, which requires it to be turned off to run. The precise steps to do this are illustrated as shown in the picture below.

   

Apply the License Key

Contact ComPDFKit's sales team to get a license for free to test this project.

1. Import the header file "ComPDFKit/ComPDFKit.h" to AppDelegate.m.

2. Follow the code below and call the method CPDFKit verifyWithKey:@"LICENSE_KEY" in - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions. You need to replace the LICENSE_KEY with the license you obtained.

   #import <ComPDFKit/ComPDFKit.h>
   
   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     // Set your license key here. ComPDFKit is commercial software.
     // Each ComPDFKit license is bound to a specific app bundle id.
     // com.compdfkit.pdfviewer
       
       [CPDFKit verifyWithKey:@"YOUR_LICENSE_KEY_GOES_HERE"];
       
       return YES;
   }

3. Compile and run the project. If the console outputs "version information", it means that the license has been set successfully. Otherwise, please check "[Troubleshooting](#2.4.5 Troubleshooting)" or check error logs in the console to quickly identify and solve the issue.

Display a PDF Document

So far, we have added "ComPDFKit.xcframework" to the "PDFViewer" project and finished the initialization of the ComPDFKit PDF SDK. Now, let’s start building a simple PDF viewer with just a few lines of code.

1. Prepare a test PDF file, and drag and drop it into the newly created PDFView project. In this way, you can load and preview the local PDF document using NSBundle. The following image shows an example of importing a PDF document named “Online5” into the project.

   

2. Import <ComPDFKit/ComPDFKit.h> at the top of your UIViewController.m subclass implementation:

   #import <ComPDFKit/ComPDFKit.h>

3. Create a CPDFDocument object through NSURL, and create a CPDFView to display it. The following code shows how to load PDF data using a local PDF path and display it by CPDFView.

   NSBundle *bundle  = [NSBundle mainBundle];
   NSString *pdfPath= [bundle pathForResource:@"Online5" ofType:@"pdf"];
   NSURL *url = [NSURL fileURLWithPath:pdfPath];
   CPDFDocument *document = [[CPDFDocument alloc] initWithURL:url];
   
   CGRect rect = self.view.bounds;
   CPDFView *pdfView = [[CPDFView alloc] initWithFrame:rect];
   pdfView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
   pdfView.document = document;

4. Add the created CPDFView to the view of the current controller. The sample code is shown below.

    [self.view addSubview:pdfView];

5. The code shown here is a collection of the steps mentioned above:

   - (void)viewWillAppear:(BOOL)animated {
       [super viewWillAppear:animated];
       
       NSBundle *bundle  = [NSBundle mainBundle];
       NSString *pdfPath= [bundle pathForResource:@"Online5" ofType:@"pdf"];
       NSURL *url = [NSURL fileURLWithPath:pdfPath];
       CPDFDocument *document = [[CPDFDocument alloc] initWithURL:url];
   
       CGRect rect = self.view.bounds;
       CPDFView *pdfView = [[CPDFView alloc] initWithFrame:rect];
       pdfView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
       pdfView.document = document;
       [self.view addSubview:pdfView];
   }

6. Connect your device or simulator, and use the shortcut Command_R to run the App. The PDF file will be opened and displayed.

   

Troubleshooting

1. Bitcode

   Even when all configurations are correct, there may still be compilation errors. First, check if the Bitcode is disabled. In earlier versions of Xcode (such as Xcode 13), the Bitcode option may be enabled by default. It needs to be set to No in order to run the app.

2. License

   If a License setting error occurs, ensure that the Identity (Bundle ID) setting in General matches the Bundle ID you provided when contacting us for the license. If an expired License message appears, please contact the ComPDFKit team to obtain the latest License and Key.

3. Cannot Run on i386 Architecture Simulator

   The version of Xcode 12.5 or newer, doesn't support i386 simulators. Apple dropped the i386 after switching to ARM processors and no longer maintains i386 architecture simulators. Please use ARM simulators or x86_64 architecture simulators to test and develop your program.

   So you need to search for Excluded Architectures in Build Settings in TARGETS, and then double-click it. A pop-up window will be popped up, click the plus sign (as shown below) to add i386.

   

4. No PDF Displayed

   Check if the special encoding is required in the path we passed in, or if the local path we passed in exists.

5. Other Problems

   If you meet some other problems when integrating our ComPDFKit PDF SDK for iOS, feel free to contact ComPDFKit's support team.

Samples

There are many samples in the Samples folder that demonstrate the main features of the ComPDFKit API and how to use them, such as adding watermarks, comments, forms, etc. to PDFs. You can copy the code, add it to your project and run it directly. Or, you can get our code examples for iOS. To learn more about the ComPDFKit API, please visit our API Reference.

Support

ComPDFKit has a professional R&D team that produces comprehensive technical documentation and guides to help developers. Also, you can get an immediate response when reporting your problems to our support team.

• For detailed information, please visit our Guides page.

• Stay updated with the latest improvements through our Changelog.

• For technical assistance, please reach out to our Technical Support.

• To get more details and an accurate quote, please contact our Sales Team.

License

ComPDFKit PDF SDK supports flexible licensing options, please contact our sales team to know more. Each license is only valid for one application ID in development mode. However, any documents, sample code, or source code distribution from the released package of ComPDFKit PDF SDK to any third party is prohibited.

Note

We are glad to announce that you can register a ComPDFKit API account for a free trial to process 1000 documents per month for free.