YYWebImage 中文介绍
[
](http://cocoapods.org/?q= YYWebImage)
[
](http://cocoapods.org/?q= YYWebImage)
YYWebImage is an asynchronous image loading framework (a component of YYKit).
It was created as an improved replacement for SDWebImage, PINRemoteImage and FLAnimatedImage.
It use YYCache to support memory and disk cache, and YYImage to support WebP/APNG/GIF image decode.
See these project for more information.
- Asynchronous image load from remote or local URL.
- Animated WebP, APNG, GIF support (dynamic buffer, lower memory usage).
- Baseline/progressive/interlaced image decode support.
- Image loading category for UIImageView, UIButton, MKAnnotationView and CALayer.
- Image effect: blur, round corner, resize, color tint, crop, rotate and more.
- High performance memory and disk image cache.
- High performance image loader to avoid main thread blocked.
- Fully documented.
###Load image from URL
// load from remote url
imageView.yy_imageURL = [NSURL URLWithString:@"http://github.com/logo.png"];
// load from local url
imageView.yy_imageURL = [NSURL fileURLWithPath:@"/tmp/logo.png"];
###Load animated image
// just replace `UIImageView` with `YYAnimatedImageView`
UIImageView *imageView = [YYAnimatedImageView new];
imageView.yy_imageURL = [NSURL URLWithString:@"http://github.com/ani.webp"];
###Load image progressively
// progressive
[imageView yy_setImageWithURL:url options:YYWebImageOptionProgressive];
// progressive with blur and fade animation (see the demo at the top of this page)
[imageView yy_setImageWithURL:url options:YYWebImageOptionProgressiveBlur | YYWebImageOptionSetImageWithFadeAnimation];
###Load and process image
// 1. download image from remote
// 2. get download progress
// 3. resize image and add round corner
// 4. set image with a fade animation
[imageView yy_setImageWithURL:url
placeholder:nil
options:YYWebImageOptionSetImageWithFadeAnimation
progress:^(NSInteger receivedSize, NSInteger expectedSize) {
progress = (float)receivedSize / expectedSize;
}
transform:^UIImage *(UIImage *image, NSURL *url) {
image = [image yy_imageByResizeToSize:CGSizeMake(100, 100) contentMode:UIViewContentModeCenter];
return [image yy_imageByRoundCornerRadius:10];
}
completion:^(UIImage *image, NSURL *url, YYWebImageFromType from, YYWebImageStage stage, NSError *error) {
if (from == YYWebImageFromDiskCache) {
NSLog(@"load from disk cache");
}
}];
###Image Cache YYImageCache *cache = [YYWebImageManager sharedManager].cache;
// get cache capacity
cache.memoryCache.totalCost;
cache.memoryCache.totalCount;
cache.diskCache.totalCost;
cache.diskCache.totalCount;
// clear cache
[cache.memoryCache removeAllObjects];
[cache.diskCache removeAllObjects];
// clear disk cache with progress
[cache.diskCache removeAllObjectsWithProgressBlock:^(int removedCount, int totalCount) {
// progress
} endBlock:^(BOOL error) {
// end
}];
- Update cocoapods to the latest version.
- Add
pod "YYWebImage"
to your Podfile. - Run
pod install
orpod update
. - Import <YYWebImage/YYWebImage.h>
- Add
github "ibireme/YYWebImage"
to your Cartfile. - Run
carthage update --platform ios
and add the framework to your project. - Import <YYWebImage/YYWebImage.h>
- Notice: carthage framework doesn't include webp component, if you want to support webp, use cocoapods or install manually.
- Download all the files in the YYWebImage subdirectory.
- Add the source files to your Xcode project.
- Link with required frameworks:
- UIKit
- CoreFoundation
- QuartzCore
- AssetsLibrary
- ImageIO
- Accelerate
- MobileCoreServices
- sqlite3
- libz
- Add
Vendor/WebP.framework
(static library) to your Xcode project if you want to support WebP. - Import
YYWebImage.h
.
Full API documentation is available on CocoaDocs.
You can also install documentation locally using appledoc.
This library requires a deployment target of iOS 6.0 or greater.
YYWebImage is provided under the MIT license. See LICENSE file for details.
YYWebImage 是一个异步图片加载框架 (YYKit 组件之一).
其设计目的是试图替代 SDWebImage、PINRemoteImage、FLAnimatedImage 等开源框架,它支持这些开源框架的大部分功能,同时增加了大量新特性、并且有不小的性能提升。
它底层用 YYCache 实现了内存和磁盘缓存, 用 YYImage 实现了 WebP/APNG/GIF 动图的解码和播放。
你可以查看这些项目以获得更多信息。
- 异步的图片加载,支持 HTTP 和本地文件。
- 支持 GIF、APNG、WebP 动画(动态缓存,低内存占用)。
- 支持逐行扫描、隔行扫描、渐进式图像加载。
- UIImageView、UIButton、MKAnnotationView、CALayer 的 Category 方法支持。
- 常见图片处理:模糊、圆角、大小调整、裁切、旋转、色调等。
- 高性能的内存和磁盘缓存。
- 高性能的图片设置方式,以避免主线程阻塞。
- 每个类和方法都有完善的文档注释。
###从 URL 加载图片
// 加载网络图片
imageView.yy_imageURL = [NSURL URLWithString:@"http://github.com/logo.png"];
// 加载本地图片
imageView.yy_imageURL = [NSURL fileURLWithPath:@"/tmp/logo.png"];
###加载动图
// 只需要把 `UIImageView` 替换为 `YYAnimatedImageView` 即可。
UIImageView *imageView = [YYAnimatedImageView new];
imageView.yy_imageURL = [NSURL URLWithString:@"http://github.com/ani.webp"];
###渐进式图片加载
// 渐进式:边下载边显示
[imageView yy_setImageWithURL:url options:YYWebImageOptionProgressive];
// 渐进式加载,增加模糊效果和渐变动画 (见本页最上方的GIF演示)
[imageView yy_setImageWithURL:url options:YYWebImageOptionProgressiveBlur | YYWebImageOptionSetImageWithFadeAnimation];
###加载、处理图片
// 1. 下载图片
// 2. 获得图片下载进度
// 3. 调整图片大小、加圆角
// 4. 显示图片时增加一个淡入动画,以获得更好的用户体验
[imageView yy_setImageWithURL:url
placeholder:nil
options:YYWebImageOptionSetImageWithFadeAnimation
progress:^(NSInteger receivedSize, NSInteger expectedSize) {
progress = (float)receivedSize / expectedSize;
}
transform:^UIImage *(UIImage *image, NSURL *url) {
image = [image yy_imageByResizeToSize:CGSizeMake(100, 100) contentMode:UIViewContentModeCenter];
return [image yy_imageByRoundCornerRadius:10];
}
completion:^(UIImage *image, NSURL *url, YYWebImageFromType from, YYWebImageStage stage, NSError *error) {
if (from == YYWebImageFromDiskCache) {
NSLog(@"load from disk cache");
}
}];
###图片缓存 YYImageCache *cache = [YYWebImageManager sharedManager].cache;
// 获取缓存大小
cache.memoryCache.totalCost;
cache.memoryCache.totalCount;
cache.diskCache.totalCost;
cache.diskCache.totalCount;
// 清空缓存
[cache.memoryCache removeAllObjects];
[cache.diskCache removeAllObjects];
// 清空磁盘缓存,带进度回调
[cache.diskCache removeAllObjectsWithProgressBlock:^(int removedCount, int totalCount) {
// progress
} endBlock:^(BOOL error) {
// end
}];
- 将 cocoapods 更新至最新版本.
- 在 Podfile 中添加
pod "YYWebImage"
。 - 执行
pod install
或pod update
。 - 导入 <YYWebImage/YYWebImage.h>。
- 在 Cartfile 中添加
github "ibireme/YYWebImage"
。 - 执行
carthage update --platform ios
并将生成的 framework 添加到你的工程。 - 导入 <YYWebImage/YYWebImage.h>。
- 注意: carthage framework 并没有包含 webp 组件。如果你需要支持 webp,可以用 cocoapods 安装,或者手动安装。
- 下载 YYWebImage 文件夹内的所有内容。
- 将 YYWebImage 内的源文件添加(拖放)到你的工程。
- 链接以下 frameworks:
- UIKit
- CoreFoundation
- QuartzCore
- AssetsLibrary
- ImageIO
- Accelerate
- MobileCoreServices
- sqlite3
- libz
- 如果你需要支持 WebP,可以将
Vendor/WebP.framework
(静态库) 加入你的工程。 - 导入
YYWebImage.h
。
你可以在 CocoaDocs 查看在线 API 文档,也可以用 appledoc 本地生成文档。
该项目最低支持 iOS 6.0。
YYWebImage 使用 MIT 许可证,详情见 LICENSE 文件。