ImageCDN

ImageCDN is providing set of functions to improve handling of images from CDN.

public protocol ImageCDN 

Default Implementations

urlRequest(forImage:)

public func urlRequest(forImage url: URL) -> URLRequest 

Requirements

cachingKey(forImage:​)

Customised (filtered) key for image cache.

func cachingKey(forImage url: URL) -> String

Parameters

• imageURL: URL of the image that should be customised (filtered).

Returns

String to be used as an image cache key.

urlRequest(forImage:​)

Prepare and return a URLRequest for the given image URL This function can be used to inject custom headers for image loading request.

func urlRequest(forImage url: URL) -> URLRequest

thumbnailURL(originalURL:​preferredSize:​)

Enhance image URL with size parameters to get thumbnail

func thumbnailURL(originalURL: URL, preferredSize: CGSize) -> URL

Use view size in points for preferredSize, point to pixel ratio (scale) of the device is applied inside of this function.

Parameters

• originalURL: URL of the image to get the thumbnail for.
• preferredSize: The requested thumbnail size.