This library provides an async image downloader with cache support. For convenience, we added categories for UI elements like UIImageView, UIButton, MKAnnotationView.

Features

• Categories for UIImageView, UIButton, MKAnnotationView adding web image and cache management
• An asynchronous image downloader
• An asynchronous memory + disk image caching with automatic cache expiration handling
• A background image decompression
• Improved support for animated images
• Customizable and composable transformations can be applied to the images right after download
• Custom cache control
• Expand the image loading capabilites by adding your own custom loaders or using prebuilt loaders like FLAnimatedImage plugin or Photos Library plugin
• Loading indicators
• A guarantee that the same URL won't be downloaded several times
• A guarantee that bogus URLs won't be retried again and again
• A guarantee that main thread will never be blocked
• Performances!
• Use GCD and ARC

Supported Image Formats

• Image formats supported by UIImage (JPEG, PNG, ...), including GIF
• WebP format, including animated WebP (use the SDWebImageWebPCoder project)

Additional modules

In order to keep SDWebImage focused and limited to the core features, but also allow extensibility and custom behaviors, during the 5.0 refactoring we focused on modularizing the library. As such, we have moved/built new modules to SDWebImage org.

Coders for additional image formats

• SDWebImageWebPCoder - coder for WebP image format. Based on libwebp
• SDWebImageHEIFCoder - coder to support HEIF image without Apple's Image/IO framework
• SDWebImageAPNGCoder - coder for APNG format (animated PNG)
• SDWebImageBPGCoder - coder for BPG format

Loaders

• SDWebImagePhotosPlugin - plugin to support loading images from Photos (using Photos.framework)

Integration with 3rd party libraries

• SDWebImageFLPlugin - plugin to support FLAnimatedImage as the engine for animated GIFs
• SDWebImageYYPlugin - plugin to integrate YYImage & YYCache for image rendering & caching
• SDWebImageProgressiveJPEGDemo - demo project for using SDWebImage + Concorde library for Progressive JPEG decoding

Make our lives easier

• libwebp-Xcode - A wrapper for libwebp + an Xcode project.

You can use those directly, or create similar components of your own.

Requirements

• iOS 8.0 or later
• tvOS 9.0 or later
• watchOS 2.0 or later
• macOS 10.10 or later
• Xcode 9.0 or later

Backwards compatibility

• For iOS 7, macOS 10.9 or Xcode < 8, use any 4.x version up to 4.3.3
• For macOS 10.8, use any 4.x version up to 4.3.0
• For iOS 5 and 6, use any 3.x version up to 3.7.6
• For iOS < 5.0, please use the last 2.0 version.

Getting Started

• Read this Readme doc
• Read the How to use section
• Read the Documentation @ CocoaDocs
• Try the example by downloading the project from Github or even easier using CocoaPods try pod try SDWebImage
• Read the Installation Guide
• Read the SDWebImage 5.0 Migration Guide to get an idea of the changes from 4.x to 5.x
• Read the SDWebImage 4.0 Migration Guide to get an idea of the changes from 3.x to 4.x
• Read the Common Problems to find the solution for common problems
• Go to the Wiki Page for more information such as Advanced Usage

Who Uses It

• Find out who uses SDWebImage and add your app to the list.

Communication

• If you need help, use Stack Overflow. (Tag 'sdwebimage')
• If you'd like to ask a general question, use Stack Overflow.
• If you found a bug, open an issue.
• If you have a feature request, open an issue.
• If you want to contribute, read the Contributing Guide

How To Use

• Objective-C

#import <SDWebImage/UIImageView+WebCache.h>
...
[imageView sd_setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
             placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

• Swift

import SDWebImage

imageView.sd_setImage(with: URL(string: "http://www.domain.com/path/to/image.jpg"), placeholderImage: UIImage(named: "placeholder.png"))

• For details about how to use the library and clear examples, see The detailed How to use

Animated Images (GIF) support

In 5.0, we introduced a brand new mechanism for supporting animated images. This includes animated image loading, rendering, decoding, and also supports customizations (for advanced users). This animated image solution is available for iOS/tvOS/macOS. The SDAnimatedImage is subclass of UIImage/NSImage, and SDAnimatedImageView is subclass of UIImageView/NSImageView, to make them compatible with the common frameworks APIs. See Animated Image for more detailed information.

FLAnimatedImage integration has its own dedicated repo

In order to clean up things and make our core project do less things, we decided that the FLAnimatedImage integration does not belong here. From 5.0, this will still be available, but under a dedicated repo SDWebImageFLPlugin.

Installation

There are three ways to use SDWebImage in your project:

• using CocoaPods
• using Carthage
• by cloning the project into your repository

Installation with CocoaPods

CocoaPods is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries in your projects. See the Get Started section for more details.

Podfile

platform :ios, '7.0'
pod 'SDWebImage', '~> 4.0'

If you are using Swift, be sure to add use_frameworks! and set your target to iOS 8+:

platform :ios, '8.0'
use_frameworks!

Subspecs

There are 2 subspecs available now: Core and MapKit (this means you can install only some of the SDWebImage modules. By default, you get just Core, so if you need MapKit, you need to specify it).

Podfile example:

pod 'SDWebImage/MapKit'

Installation with Carthage (iOS 8+)

Carthage is a lightweight dependency manager for Swift and Objective-C. It leverages CocoaTouch modules and is less invasive than CocoaPods.

To install with carthage, follow the instruction on Carthage

Carthage users can point to this repository and use whichever generated framework they'd like: SDWebImage, SDWebImageMapKit or both.

Make the following entry in your Cartfile: github "rs/SDWebImage" Then run carthage update If this is your first time using Carthage in the project, you'll need to go through some additional steps as explained over at Carthage.

NOTE: At this time, Carthage does not provide a way to build only specific repository subcomponents (or equivalent of CocoaPods's subspecs). All components and their dependencies will be built with the above command. However, you don't need to copy frameworks you aren't using into your project. For instance, if you aren't using SDWebImageMapKit, feel free to delete that framework from the Carthage Build directory after carthage update completes.

Installation by cloning the repository

• see Manual install

Import headers in your source files

In the source files where you need to use the library, import the header file:

#import <SDWebImage/UIImageView+WebCache.h>

Build Project

At this point your workspace should build without error. If you are having problem, post to the Issue and the community can help you solve it.

Author

• Olivier Poitrey

Collaborators

• Konstantinos K.
• Bogdan Poplauschi
• Chester Liu
• DreamPiggy
• Wu Zhong

Licenses

All source code is licensed under the MIT License.

Architecture

High Level Diagram

Overall Class Diagram

Top Level API Diagram

Main Sequence Diagram

More detailed diagrams

• Manager API Diagram
• Coders API Diagram
• Loader API Diagram
• Cache API Diagram