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https://github.com/JanGorman/Agrume

🍋 A lemony fresh iOS image viewer written in Swift.
https://github.com/JanGorman/Agrume

carthage cocoapods image image-viewer ios swift

Last synced: about 1 month ago
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🍋 A lemony fresh iOS image viewer written in Swift.

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README 

        
# Agrume



[![Build Status](https://travis-ci.org/JanGorman/Agrume.svg?branch=master)](https://travis-ci.org/JanGorman/Agrume) [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)

[![Version](https://img.shields.io/cocoapods/v/Agrume.svg?style=flat)](http://cocoapods.org/pods/Agrume)

[![License](https://img.shields.io/cocoapods/l/Agrume.svg?style=flat)](http://cocoapods.org/pods/Agrume)

[![Platform](https://img.shields.io/cocoapods/p/Agrume.svg?style=flat)](http://cocoapods.org/pods/Agrume)

[![SPM](https://img.shields.io/badge/spm-compatible-brightgreen.svg?style=flat)](https://swift.org/package-manager)



An iOS image viewer written in Swift with support for multiple images.



![Agrume](https://www.dropbox.com/s/bdt6sphcyloa38u/Agrume.gif?raw=1)



## Requirements



- Swift 5.0

- iOS 9.0+

- Xcode 10.2+



## Installation



Use [Swift Package Manager](https://swift.org/package-manager).



Or [CocoaPods](http://cocoapods.org). Add the dependency to your `Podfile` and then run `pod install`:



```ruby

pod "Agrume"

```



Or [Carthage](https://github.com/Carthage/Carthage). Add the dependency to your `Cartfile` and then run `carthage update`:



```ogdl

github "JanGorman/Agrume"

```



## Usage



There are multiple ways you can use the image viewer (and the included sample project shows them all).



For just a single image it's as easy as



### Basic



```swift

import Agrume



private lazy var agrume = Agrume(image: UIImage(named: "…")!)



@IBAction func openImage(_ sender: Any) {

  agrume.show(from: self)

}

```



You can also pass in a `URL` and Agrume will take care of the download for you.



### SwiftUI



Currently the SwiftUI implementation doesn't surface configurations, so can only be used as a basic image viewer - PRs welcome to extend its functionality.



```swift

import Agrume



struct ExampleView: View {

    

  let images: [UIImage]



  @State var showAgrume = false



  var body: some View {

    VStack {

      // Hide the presenting button (or other view) whenever Agrume is shown

      if !showAgrume {

        Button("Launch Agrume from SwiftUI") {

          withAnimation {

            showAgrume = true

          }

        }

      }



      if showAgrume {

        // You can pass a single or multiple images

        AgrumeView(images: images, isPresenting: $showAgrume)

      }

    }

  }

}

```



### Background Configuration



Agrume has different background configurations. You can have it blur the view it's covering or supply a background color:



```swift

let agrume = Agrume(image: UIImage(named: "…")!, background: .blurred(.regular))

// or

let agrume = Agrume(image: UIImage(named: "…")!, background: .colored(.green))

```



### Multiple Images



If you're displaying a `UICollectionView` and want to add support for zooming, you can also call Agrume with an array of either images or URLs.



```swift

// In case of an array of [UIImage]:

let agrume = Agrume(images: images, startIndex: indexPath.item, background: .blurred(.light))

// Or an array of [URL]:

// let agrume = Agrume(urls: urls, startIndex: indexPath.item, background: .blurred(.light))



agrume.didScroll = { [unowned self] index in

  self.collectionView.scrollToItem(at: IndexPath(item: index, section: 0), at: [], animated: false)

}

agrume.show(from: self)

```



This shows a way of keeping the zoomed library and the one in the background synced.



### Animated gifs



Agrume bundles [SwiftyGif](https://github.com/kirualex/SwiftyGif) to display animated gifs. You use SwiftyGif's custom `UIImage` initializer:



```swift

let image = UIImage(gifName: "animated.gif")

let agrume = Agrume(image: image)

agrume.display(from: self)



// Or gif using data:



let image = UIImage(gifData: data)

let agrume = Agrume(image: image)



// Or multiple images:



let images = [UIImage(gifName: "animated.gif"), UIImage(named: "foo.png")] // You can pass both animated and regular images at the same time

let agrume = Agrume(images: images)

```



Remote animated gifs (i.e. using the url or urls initializer) are supported. Agrume does the image type detection and displays them properly. If using Agrume from a custom `UIImageView` you may need to rebuild the `UIImage` using the original data to preserve animation vs. using the `UIImage` instance from the image view.



### Close Button



Per default you dismiss the zoomed view by dragging/flicking the image off screen. You can opt out of this behaviour and instead display a close button. To match the look and feel of your app you can pass in a custom `UIBarButtonItem`:



```swift

// Default button that displays NSLocalizedString("Close", …)

let agrume = Agrume(image: UIImage(named: "…")!, .dismissal: .withButton(nil))

// Customise the button any way you like. For example display a system "x" button

let button = UIBarButtonItem(barButtonSystemItem: .stop, target: nil, action: nil)

button.tintColor = .red

let agrume = Agrume(image: UIImage(named: "…")!, .dismissal: .withButton(button))

```



The included sample app shows both cases for reference.



### Custom Download Handler



If you want to take control of downloading images (e.g. for caching), you can also set a download closure that calls back to Agrume to set the image. For example, let's use [MapleBacon](https://github.com/JanGorman/MapleBacon).



```swift

import Agrume

import MapleBacon



private lazy var agrume = Agrume(url: URL(string: "https://dl.dropboxusercontent.com/u/512759/MapleBacon.png")!)



@IBAction func openURL(_ sender: Any) {

  agrume.download = { url, completion in

    Downloader.default.download(url) { image in

      completion(image)

    }

  }

  agrume.show(from: self)

}

```



### Global Custom Download Handler



Instead of having to define a handler on a per instance basis you can instead set a handler on the `AgrumeServiceLocator`. Agrume will use this handler for all downloads unless overriden on an instance as described above:



```swift

import Agrume



AgrumeServiceLocator.shared.setDownloadHandler { url, completion in

  // Download data, cache it and call the completion with the resulting UIImage

}



// Some other place

agrume.show(from: self)

```



### Custom Data Source



For more dynamic library needs you can implement the `AgrumeDataSource` protocol that supplies images to Agrume. Agrume will query the data source for the number of images and if that number changes, reload it's scrolling image view.



```swift

import Agrume



let dataSource: AgrumeDataSource = MyDataSourceImplementation()

let agrume = Agrume(dataSource: dataSource)



agrume.show(from: self)

```



### Status Bar Appearance



You can customize the status bar appearance when displaying the zoomed in view. `Agrume` has a `statusBarStyle` property:



```swift

let agrume = Agrume(image: image)

agrume.statusBarStyle = .lightContent

agrume.show(from: self)

```



### Long Press Gesture and Downloading Images



If you want to handle long press gestures on the images, there is an optional `onLongPress` closure. This will pass an optional `UIImage` and a reference to the Agrume `UIViewController` as parameters. The project includes a helper class to easily opt into downloading the image to the user's photo library called `AgrumePhotoLibraryHelper`. First, create an instance of the helper:



```swift

private func makeHelper() -> AgrumePhotoLibraryHelper {

  let saveButtonTitle = NSLocalizedString("Save Photo", comment: "Save Photo")

  let cancelButtonTitle = NSLocalizedString("Cancel", comment: "Cancel")

  let helper = AgrumePhotoLibraryHelper(saveButtonTitle: saveButtonTitle, cancelButtonTitle: cancelButtonTitle) { error in

    guard error == nil else {

      print("Could not save your photo")

      return

    }

    print("Photo has been saved to your library")

  }

  return helper

}

```



and then pass this helper's long press handler to `Agrume` as follows:



```swift

let helper = makeHelper()

agrume.onLongPress = helper.makeSaveToLibraryLongPressGesture

```



### Custom Overlay View



You can customise the look and functionality of the image views. To do so, you need create a class that inherits from `AgrumeOverlayView: UIView`. As this is nothing more than a regular `UIView` you can do anything you want with it like add a custom toolbar or buttons to it. The example app shows a detailed example of how this can be achieved.



### Live Text Support



Agrume supports Live Text introduced since iOS 16. This allows user to interact with texts and QR codes in the image. It is available for iOS 16 or newer, on devices with A12 Bionic Chip (iPhone XS) or newer.



```swift

let agrume = Agrume(image: UIImage(named: "…")!, enableLiveText: true)

```



### Lifecycle



`Agrume` offers the following lifecycle closures that you can optionally set:



- `willDismiss`

- `didDismiss`

- `didScroll`



### Running the Sample Code



The project ships with an example app that shows the different functions documented above. Since there is a dependency on [SwiftyGif](https://github.com/kirualex/SwiftyGif) you will also need to fetch that to run the project. It's included as git submodule. After fetching the repository, from the project's root directory run:



```bash

git submodule update --init

```



## Licence



Agrume is released under the MIT license. See LICENSE for details