High Performance Full Screen Image and Video browser in iOS

A-J-Full-Screen-Image-Browser

A-J-Full-Screen-Image-Browser is an drop-in solution for full screen image and video browser.

Features

[x] No Dependency, 100% iOS Native
[x] Support both iPad and iPhone family
[x] Support image resizing on different screen orientation
[x] Support multiple videos and images
[x] Image can be panned, zoomed and rotated
[x] Double tap to zoom all the way in and again to zoom all the way out
[x] Swipe to dismiss
[x] High level diagram
[x] MVVM architecture
[x] Full documentation
[x] Easy to customise

Requirements

iOS 9.0+ / macOS 10.10+ / tvOS 9.0+ / watchOS 2.0+
Xcode 9.0+
Swift 4.0+

Installation

drag and drop the entire A_J_Full_Screen_Image_Browser into your project

Full Usage Example

import UIKit

final class ViewController: UIViewController {

    lazy var testVideo: MediaDownloadable = {
        return SingleMedia(imageURL: URL(string: "https://dummyimage.com/600&text=thumbnail")!,
                    isVideoThumbnail: true,
                    videoURL: URL(string: "http://jplayer.org/video/m4v/Big_Buck_Bunny_Trailer.m4v")!)
    }()

    lazy var media: [MediaDownloadable] = {
        return [testVideo,
                SingleMedia(imageURL: URL(string: "https://dummyimage.com/300")!),
                SingleMedia(imageURL: URL(string: "https://dummyimage.com/600")!),
                testVideo]
    }()

    @IBAction func onButtonTapped(_ sender: UIButton) {
        let vm = FullScreenImageBrowserViewModel(media: media)
        let browser = FullScreenImageBrowser(viewModel: vm)
        present(browser, animated: true, completion: nil)
    }

}

AlamofireImage Support

By default, FullScreenImageBrowser doesn't use any 3rd library, the SingleImage uses URLSession to fetch image. However it's designed to be compatible with any networking library, one good example is AlamofireImage

The following code snippet shows an example how to use AlamofireImage to seamlessly integrated with FullScreenImageBrowser.

import Foundation
import AlamofireImage

public class FullScreenImage: MediaDownloadable {
    public var image: UIImage?
    public var imageURL: URL?
    public var videoURL: URL?
    public var isVideoThumbnail: Bool

    public init(imageURL: URL?, isVideoThumbnail: Bool = false, videoURL: URL? = nil) {
        self.imageURL = imageURL
        self.videoURL = videoURL
        self.isVideoThumbnail = isVideoThumbnail
    }

    public func loadImageWithCompletionHandler(_ completion: @escaping (UIImage?, NSError?) -> Void) {
        if let image = image {
            completion(image, nil)
            return
        }
        loadImageWithURL(imageURL, completion: completion)
    }

    // use any network calls you like
    public func loadImageWithURL(_ url: URL?, completion: @escaping (_ image: UIImage?, _ error: NSError?) -> Void) {
        guard let _url = url else {
            completion(nil, NSError(domain: "FullScreenImageBrowserDomain",
                                    code: -2,
                                    userInfo: [ NSLocalizedDescriptionKey: "Image URL not found."]))
            return
        }
        let urlRequest = URLRequest(url: _url)

        downloader.download(urlRequest) { [weak self] response in
            debugPrint(response.result)

            if let remoteImage = response.result.value {
                self?.image = remoteImage
                completion(remoteImage, nil)
            } else {
                completion(nil, NSError(domain: "FullScreenImageBrowserDomain",
                                        code: -1,
                                        userInfo: [ NSLocalizedDescriptionKey: "Couldn't load image from remote"]))
            }
        }
    }
}

Folder Structure

├── animator
│   └── FullScreenImageTransitionAnimator.swift
├── asset
│   └── FullScreenImageBrowser.bundle
│       ├── close.png
│       ├── close@2x.png
│       └── close@3x.png
├── core
│   ├── FullScreenImageBrowser.swift
│   ├── FullScreenImageBrowserViewModel.swift
│   ├── MediaDownloadable.swift
│   ├── MaskImageViewer.swift
│   ├── SingleImageViewer.swift
│   └── ZoomableImageView.swift
└── helper
    ├── SingleImage.swift
    └── UIView+SnapShot.swift

File	Responsiblity
animator	customised fade in/fade out animations with damping factors
asset	customised static image asset for the full screen image/video browser navigation bar
core/FullScreenImageBrowser	manager class to be responsible for full screen image/video browser
core/FullScreenImageBrowserViewModel	datasource and business logic for full screen image/video browser
core/MediaDownloadable	protocol to define images to be able to asynchronously download
core/MaskImageViewer	`customised` overlay view for full screen image/video browser
core/SingleImageViewer	view controller to be responsible for single image rendering on the full screen
core/ZoomableImageView	view to add support for image to zoom, pin, rotate, and animation