Using QLPreviewController

//
//  ViewController.m
//  QLPreview
//
//  Created by Don Mag on 10/24/22.
//

#import "ViewController.h"

@import QuickLook;

/*
 *  Quicklook Preview Item
 */
@interface PreviewItem : NSObject <QLPreviewItem>
@property(readonly, nullable, nonatomic) NSURL    *previewItemURL;
@property(readonly, nullable, nonatomic) NSString *previewItemTitle;
@end
@implementation PreviewItem
- (instancetype)initPreviewURL:(NSURL *)docURL
                     WithTitle:(NSString *)title {
    self = [super init];
    if (self) {
        _previewItemURL = [docURL copy];
        _previewItemTitle = [title copy];
    }
    return self;
}
@end
/***/

/*
 *  QuickLook Datasource for rending PDF docs
 */
@interface PDFDataSource : NSObject <QLPreviewControllerDataSource>
@property (strong, nonatomic) PreviewItem *item;
@end
@implementation PDFDataSource
- (instancetype)initWithPreviewItem:(PreviewItem *)item {
    self = [super init];
    if (self) {
        _item = item;
    }
    return self;
}
- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller {
    return 1;
}
- (id<QLPreviewItem>)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {
    return self.item;
}
@end
/***/

@interface ViewController ()

@property (strong, nonatomic) PDFDataSource *pdfDatasource;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = UIColor.systemBlueColor;

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

    /*
     *  get the path to the pdf resource.
     */

    NSString *path =
    [[NSBundle mainBundle] pathForResource:@"article"
                                    ofType:@"pdf"];

    if (!path) {
        NSLog(@"Could not find article.pdf in bundle!");
        return;
    }

    NSURL *docURL = [NSURL fileURLWithPath:path];


    /*
     *  create the Quicklook controller.
     */

    QLPreviewController *qlController =
    [[QLPreviewController alloc] init];

    PreviewItem *item =
    [[PreviewItem alloc] initPreviewURL:docURL
                              WithTitle:@"Article"];
    self.pdfDatasource =
    [[PDFDataSource alloc] initWithPreviewItem:item];

    qlController.dataSource = self.pdfDatasource;


    /*
     *  present the document.
     */

    [self presentViewController:qlController
                       animated:YES completion:nil];
}

@end