avito-tech/ImageSource

Image abstraction toolkit

ImageSource is an image abstraction. It is intended to represent an image that can come from many different sources.

Some examples of the sources are:

• file system (LocalImageSource)
• network (RemoteImageSource)
• user's photo library (PHAssetImageSource)

It allows you to retrieve the actual bitmap in a simple and efficient way using the unified API and supports retrieval cancellation. It is also designed to be platform-independent, so you can use it both on iOS and macOS.

• Installation
  • CocoaPods
• Typical use cases
  • Displaying in UI
  • Getting image data
  • Getting image size
• Implementing custom ImageSource

Installation

CocoaPods

To integrate ImageSource into your Xcode project using CocoaPods, specify it in your Podfile:

use_frameworks!

target '<Your Target Name>' do
    pod 'ImageSource'
end

Then, run the following command:

$ pod install

Typical use cases

Displaying in UI

To present ImageSource in UIImageView, you should use extension method that comes with ImageSource/UIKit pod:

func setImage(
    fromSource: ImageSource?,
    size: CGSize? = nil,
    placeholder: UIImage? = nil,
    placeholderDeferred: Bool = false,
    adjustOptions: ((_ options: inout ImageRequestOptions) -> ())? = nil,
    resultHandler: ((ImageRequestResult<UIImage>) -> ())? = nil)
    -> ImageRequestId?

In most cases, however, you would want to just use its simplest version, passing only the first parameter:

imageView.setImage(fromSource: imageSource)

Getting image data

To get image data use ImageSource.fullResolutionImageData(completion:):

imageSource.fullResolutionImageData { data in
    try? data?.write(to: fileUrl)
}

Getting image size

To get image size use ImageSource.imageSize(completion:):

imageSource.imageSize { size in
    // do something with size
}