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iphone手机浏览器或者默认的UIWebView和WKWebView都可以展示pdf，但是如果pdf上有电子签章啥的，他们都展示不了了。

@interface ViewController () <QLPreviewControllerDataSource>

@property (strong, nonatomic)QLPreviewController *previewController;
@property (copy, nonatomic)NSURL *fileURL; //文件路径

@end

- (void)viewDidLoad {
    [super viewDidLoad];
    self.previewController  =  [[QLPreviewController alloc]  init];
    self.previewController.dataSource  = self;
}

//预览网络文件
- (void)previewInternet:(id)sender {
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
    NSString *urlStr = @"pdf下载链接";
    NSString *fileName = [urlStr lastPathComponent]; //获取文件名称
    if (![fileName containsString:@".pdf"]) {
        fileName = [fileName stringByAppendingString:@".pdf"];
    }
    NSURL *URL = [NSURL URLWithString:urlStr];
    NSURLRequest *request = [NSURLRequest requestWithURL:URL];
    
    //判断是否存在
    if([self isFileExist:fileName]) {
        NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
        NSURL *url = [documentsDirectoryURL URLByAppendingPathComponent:fileName];
        self.fileURL = url;      
       [self addChildViewController:self.previewController];
      self.previewController.view.frame = self.view.frame;
      [self.view addSubview:previewController.view];
        //刷新界面,如果不刷新的话，不重新走一遍代理方法，返回的url还是上一次的url
        [self.previewController refreshCurrentPreviewItem];
    }else {
        NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress *downloadProgress){

        } destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
            NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
            NSURL *url = [documentsDirectoryURL URLByAppendingPathComponent:fileName];
            return url;
        } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
            self.fileURL = filePath;
             [self addChildViewController:self.previewController];
         self.previewController.view.frame = self.view.frame;
         [self.view addSubview:previewController.view];

            //刷新界面,如果不刷新的话，不重新走一遍代理方法，返回的url还是上一次的url
            [self.previewController refreshCurrentPreviewItem];
        }];
        [downloadTask resume];
    }
}

//判断文件是否已经在沙盒中存在
-(BOOL) isFileExist:(NSString *)fileName
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [paths objectAtIndex:0];
    NSString *filePath = [path stringByAppendingPathComponent:fileName];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL result = [fileManager fileExistsAtPath:filePath];
    return result;
}

#pragma mark - QLPreviewControllerDataSource
- (id<QLPreviewItem>)previewController:(QLPreviewController*)controller previewItemAtIndex:(NSInteger)index
{
    QLPreviewItemCustom * previewItem = [QLPreviewItemCustom new];
    previewItem.previewItemTitle = @"pdf电子签章展示";
    previewItem.previewItemURL = self.fileURL;
    return previewItem;
}
- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)previewController{
    return 1;
}
@end

#import <UIKit/UIKit.h>
#import <QuickLook/QuickLook.h>

@interface ViewController : UIViewController

@end

@interface QLPreviewItemCustom : NSObject <QLPreviewItem>
@property (nonatomic,readwrite) NSURL * previewItemURL;
@property (nonatomic,readwrite) NSString * previewItemTitle;
@end

@implementation QLPreviewItemCustom
@end