Build a basic PDF reader (PDFViewCtrl)

This guide shows how to build a basic PDF reader with FSPDFViewCtrl (display, zoom, page navigation) without UI Extensions toolbars or feature modules.

Prerequisites

Complete Integrate Foxit PDF SDK first (project setup, SDK integration, license initialization).

Step 1: Open and display a PDF with FSPDFViewCtrl

In ViewController, create FSPDFViewCtrl and call openDoc:password:completion:.

Objective-C

#import <FoxitRDK/FSPDFViewControl.h>
#import <FoxitRDK/FSPDFObjC.h>

@interface ViewController ()
@property (nonatomic, strong) FSPDFViewCtrl *pdfViewCtrl;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // Initialize FSPDFViewCtrl
    self.pdfViewCtrl = [[FSPDFViewCtrl alloc] initWithFrame:self.view.bounds];
    [self.view addSubview:self.pdfViewCtrl];

    // Open PDF
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Sample" ofType:@"pdf"];
    [self.pdfViewCtrl openDoc:path password:nil completion:^(FSErrorCode error) {
        if (error != FSErrSuccess) {
            NSLog(@"Failed to open document, error code: %d", (int)error);
        }
    }];
}

@end

Swift

import FoxitRDK

class ViewController: UIViewController {

    var pdfViewCtrl: FSPDFViewCtrl!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Initialize FSPDFViewCtrl
        pdfViewCtrl = FSPDFViewCtrl(frame: view.bounds)
        view.addSubview(pdfViewCtrl)

        // Open PDF
        if let path = Bundle.main.path(forResource: "Sample", ofType: "pdf") {
            pdfViewCtrl.openDoc(path, password: nil) { error in
                if error != .errSuccess {
                    print("Failed to open document, error code: \(error.rawValue)")
                }
            }
        }
    }
}

INFO

The sample loads from the app bundle. For Documents or network loading, see Open document.

Step 2: Listen for document events (optional)

Implement IDocEventListener to handle open, close, save, and related events:

// Register document event listener
[self.pdfViewCtrl registerDocEventListener:self];

// IDocEventListener
- (void)onDocOpened:(FSPDFDoc *)document error:(int)error {
    if (error == FSErrSuccess) {
        NSLog(@"Document opened, page count: %d", [self.pdfViewCtrl getPageCount]);
    }
}

- (void)onDocClosed:(FSPDFDoc *)document error:(int)error {
    NSLog(@"Document closed");
}