iOS UIDocumentPicker获取iCloud dri

用UIDocumentPickerViewController来获取iCloud里的文件

NSArray *documentTypes = @[@"public.content", @"public.text", @"public.source-code", @"public.image", @"public.audiovisual-content", @"com.adobe.pdf", @"com.apple.keynote.key", @"com.microsoft.word.doc", @"com.microsoft.excel.xls", @"com.microsoft.powerpoint.ppt"];
    
UIDocumentPickerViewController *documentPicker = [[UIDocumentPickerViewController alloc]initWithDocumentTypes:documentTypes inMode:UIDocumentPickerModeOpen];
documentPicker.delegate = self;
[self presentViewController:documentPicker animated:YES completion:nil];

在UIDocumentPickerDelegate的回调方法里处理获取到的文件

- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentsAtURLs:(nonnull NSArray<NSURL *> *)urls {
    //授权
    BOOL fileAuthorized = [urls.firstObject startAccessingSecurityScopedResource];
    if (fileAuthorized) {
        NSFileCoordinator *fileCoordinator = [[NSFileCoordinator alloc]init];
        NSError *error;
        
        [fileCoordinator coordinateReadingItemAtURL:urls.firstObject options:0 error:&error byAccessor:^(NSURL * _Nonnull newURL) {
            //读取文件
            NSString *fileName = [newURL lastPathComponent];
            NSString *fileNameUtf8 = [fileName stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
            NSError *error = nil;
            NSData *fileData = [NSData dataWithContentsOfURL:newURL options:NSDataReadingMappedIfSafe error:&error];
            if (error) {
                NSLog(@"读取错误");
            }else {
                NSLog(@"fileName: %@\nfileUrl: %@", fileName, newURL);
                
                //写入沙盒Documents
                NSString *path = [NSHomeDirectory() stringByAppendingString:[NSString stringWithFormat:@"/Documents/%@", fileNameUtf8]];
                [fileData writeToFile:path atomically:YES];
                NSLog(@"filePath: %@", path);
                
                if ([path hasSuffix:@".pdf"]) {
                    DTWebViewController *webView = [[DTWebViewController alloc]init];
                    webView.title = fileName;
                    [webView loadWebFileSring:fileNameUtf8];
                    [self.navigationController pushViewController:webView animated:YES];
                }
            }
            
            [self dismissViewControllerAnimated:YES completion:nil];
        }];
        
        [urls.firstObject stopAccessingSecurityScopedResource];
    }else {
        NSLog(@"授权失败");
    }
}

PS：WKWebView加载沙盒路径PDF

NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSURL *url = [NSURL fileURLWithPath:[filePath stringByAppendingPathComponent:@"xxx.pdf"]];
[self.wkWebView loadFileURL:url allowingReadAccessToURL:url];