ion-ios-fileviewer

A Swift library for iOS that allows opening files and previewing media files.

The library supports local files, app assets, and remote URLs.

Requirements

• iOS 14.0+
• Swift 5.0+
• Xcode 15.0+

Installation

CocoaPods

ion-ios-fileviewer is available through CocoaPods. Add this to your Podfile:

pod 'IONFileViewerLib', '~> 1.0.1'  # Use the latest 1.0.x version

Quick Start

This library is currently used by the File Viewer Plugin for OutSystems' Cordova and Capacitor plugins. Please check their usage for real use-case scenarios.

Features

The library's features are divided into two protocols:

• IONFLVWOpenDocumentManager
• IONFLVWPreviewMediaManager

The IONFLVWManager implements both of these protocols. To instantiate the library, you can do the following:

// Declare the type alias if you want to use all operations;
// otherwise, use the specific protocol directly.
typealias FileViewerManager = any IONFLVWOpenDocumentManager & IONFLVWPreviewMediaManager

let fileManager: FileViewerManager = IONFLVWManager(viewController: viewController)

Where viewController is a UIViewController used to present the screens for viewing files; it is required for the library to function.

IONFLVWOpenDocumentManager

The IONFLVWOpenDocumentManager manages operations for opening files like PDFs, images, and videos. Apple's Quick Look is used. It provides three operations:

• openDocumentFromLocalPath - Open a file at filePath stored in the local file system.
• openDocumentFromResources - Open a resource file of the app, using the relative path assetPath.
• openDocumentFromUrl - Download and open a file from a remote url (http[s]://...).

These methods can throw errors. See the Error Handling section for more information.

Example

To know when the user finishes viewing the file, use the completion closure. Note that for openDocumentFromUrl, completion may optionally receive an error in case something goes wrong while preparing the file to be opened (e.g., download failure).

Here’s an example of how to use openDocumentFromUrl:

import Foundation
import IONFileViewerLib

// Instantiate manager and url
do {
    try manager.openDocumentFromUrl(url: url, completion: { err in
        if let err = err {
            // Handle opening errors here
        } else {
            // Handle user finished opening file here
        }
    })
} catch {
    // Handle validation errors here
}

IONFLVWPreviewMediaManager

The IONFLVWPreviewMediaManager allows previewing media files (namely videos) with an in-app media player. It provides three operations:

• previewMediaContentFromLocalPath - Preview the contents of a local media file at filePath.
• previewMediaContentFromResources - Preview the contents of an app resource media file, using the relative path assetPath.
• previewMediaContentFromUrl - Preview the contents of a media file stored at a remote url (http[s]://...).

These methods can throw errors. See the Error Handling section for more information.

Error Handling

The library returns specific errors when there are issues viewing files. These are:

public enum IONFLVWError: LocalizedError, Equatable {
    case fileDoesNotExist(atPath: String)
    case emptyFilePath
    case couldNotOpenDocument
    case invalidURL(forUrl: String)
    case invalidEmptyURL
    case downloadFailed
    case missingFileExtension
}

Contributing

1. Fork the repository (make sure "Copy only main branch" is unchecked).
2. Checkout the development branch (git switch development).
3. Create your feature branch (git checkout -b feature/amazing-feature).
4. Commit your changes (git commit -m 'Add amazing feature').
5. Push to your branch (git push origin feature/amazing-feature).
6. Open a Pull Request to development branch.

License

ion-ios-fileviewer is available under the MIT license. See the LICENSE file for more information.

Support

• Report issues on our Issue Tracker