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README
MIT

Build Status Pod Version Pod Platform Pod License Dependency Status Reference Status Carthage compatible codecov

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
  • 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 WebP subspec)

Requirements

  • iOS 7.0 or later
  • tvOS 9.0 or later
  • watchOS 2.0 or later
  • OS X 10.8 or later
  • Xcode 7.3 or later

Backwards compatibility

Getting Started

Who Uses It

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, submit a pull request.

Installation

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"))

Animated Images (GIF) support

  • Starting with the 4.0 version, we rely on FLAnimatedImage to take care of our animated images.
  • If you use cocoapods, add pod 'SDWebImage/GIF' to your podfile.
  • To use it, simply make sure you use FLAnimatedImageView instead of UIImageView.
  • Note: there is a backwards compatible feature, so if you are still trying to load a GIF into a UIImageView, it will only show the 1st frame as a static image.
  • Important: FLAnimatedImage only works on the iOS platform, so for all the other platforms (OS X, tvOS, watchOS) we will fallback to the backwards compatibility feature described above

Common Problems

Using dynamic image size with UITableViewCell

UITableView determines the size of the image by the first image set for a cell. If your remote images don't have the same size as your placeholder image, you may experience strange anamorphic scaling issue. The following article gives a way to workaround this issue:

http://www.wrichards.com/blog/2011/11/sdwebimage-fixed-width-cell-images/

Handle image refresh

SDWebImage does very aggressive caching by default. It ignores all kind of caching control header returned by the HTTP server and cache the returned images with no time restriction. It implies your images URLs are static URLs pointing to images that never change. If the pointed image happen to change, some parts of the URL should change accordingly.

If you don't control the image server you're using, you may not be able to change the URL when its content is updated. This is the case for Facebook avatar URLs for instance. In such case, you may use the SDWebImageRefreshCached flag. This will slightly degrade the performance but will respect the HTTP caching control headers:

[imageView sd_setImageWithURL:[NSURL URLWithString:@"https://graph.facebook.com/olivier.poitrey/picture"]
             placeholderImage:[UIImage imageNamed:@"avatar-placeholder.png"]
                      options:SDWebImageRefreshCached];

Add a progress indicator

Add these before you call sd_setImageWithURL

[imageView sd_setShowActivityIndicatorView:YES];
[imageView sd_setIndicatorStyle:UIActivityIndicatorViewStyleGray];
imageView.sd_setShowActivityIndicatorView(true)
imageView.sd_setIndicatorStyle(.Gray)

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', '~>3.8'

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

Podfile example:

pod 'SDWebImage/WebP'

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

Cartfile

github "rs/SDWebImage"

Installation by cloning the repository

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

Collaborators

Licenses

All source code is licensed under the MIT License.

Architecture

Copyright (c) 2009-2017 Olivier Poitrey rs@dailymotion.com Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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