Update reademe

README.md

@@ -37,8 +37,8 @@ Kingfisher is a lightweight and pure Swift implemented library for downloading a
 * Prefetching. You can prefetch and cache the images which might soon appear in the page. It will bring your users great experience.
 * Independent components. You can use the downloader or caching system separately. Or even create your own cache based on Kingfisher's code.
 * Options to decompress the image in background before rendering it, which could improve the UI performance.
-* Categories over `UIImageView`, `NSImage` and `UIButton` for setting image from an URL directly. Use the same code across all Apple platforms.
-* Support GIF seamlessly. You could just download and set your GIF images as the same as you do for PNG/JPEG format.
+* Categories over `UIImageView`, `NSImage` and `UIButton` for setting image from a URL directly. Use the same code across all Apple platforms.
+* Support GIF seamlessly. You could just download and set your GIF images as the same as you do for PNG/JPEG format using `AnimatedImageView`.
 
 ## Requirements
 
@@ -67,7 +67,7 @@ source 'https://github.com/CocoaPods/Specs.git'
 platform :ios, '8.0'
 use_frameworks!
 
-pod 'Kingfisher', '~> 2.3'
+pod 'Kingfisher', '~> 2.4'
 ```
 
 Then, run the following command:
@@ -92,7 +92,7 @@ $ brew install carthage
 To integrate Kingfisher into your Xcode project using Carthage, specify it in your `Cartfile`:
 
 ``` ogdl
-github "onevcat/Kingfisher" ~> 2.3
+github "onevcat/Kingfisher" ~> 2.4
 ```
 
 Then, run the following command to build the Kingfisher framework:
@@ -333,11 +333,17 @@ After prefetching, you could retrieve image or set the image view with other Kin
 
 ### Animated GIF
 
-You can load animated GIF by replacing `UIImageView` with `AnimatedImageView`
+You can load animated GIF by replacing `UIImageView` with `AnimatedImageView`, and then using the same API for a regular image view like this:
+
 ```swift
-imageView = AnimatedImageView()
+let imageView = AnimatedImageView()
+imageView.kf_setImageWithURL(NSURL(string: "your_animated_gif_image_url")!)
 ```
 
+`AnimatedImageView` will only decode some frames of your GIF image to get a smaller memory footprint. You can set the frame count you need to pre-load by setting the `framePreloadCount` property of an `AnimatedImageView` (default is 10).
+
+You can also load a GIF file by a regular `UIImageView`. However, all frames will be loaded and decoded into memory. It is probably not suitable if you are loading a large GIF image. For most cases, you may want to use `AnimatedImageView`. The GIF support in Kingfisher's `UIImageView` only fits the small files, and now is mostly serving for back compatibility.
+
 ## Future of Kingfisher
 
 I want to keep Kingfisher slim. This framework will focus on providing a simple solution for image downloading and caching. But that does not mean the framework will not be improved. Kingfisher is far away from perfect, and necessary and useful features will be added later to make it better.