IOS使用UIImageView显示gif动画的例子

其中用到了两个开源代码

1.SDWebImage 异步读取图片数据2.SCGifExample gif动画控件

此工程在SCGifExample的基础上修改

最近SDWebImage刚升级，我也借此修改了我的代码，

从中摘出gif部分与大家分享

图片缩放部分我还是用的手势，感觉以下方法不怎么好用，如果大家有更好的算法请分享

图片缩放效果请在真机上使用

[cpp] view
plaincopyprint?

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

{

return imageView;

}

- (void)scrollViewDidZoom:(UIScrollView *)scrollView

{

imageView.center = scrollView.center;

if (imageView.frame.origin.x < 0)

{

setFrameX(imageView, 0);

}

if (imageView.frame.origin.y < 0)

{

setFrameY(imageView, 0);

}

}

SDWebImage内部其实也可以实现动态图片读取，我项目紧没时间改，有兴趣的可以自己改改

返回Imge时返回imageArray就可以，代码可以学习SCGifExample的实现

SDWebImage增加了4个SDWebImageManagerDelegate函数

- (void)webImageManager:(SDWebImageManager *)imageManager ActivityIndicatorView:(UIActivityIndicatorView *)activityIndicatorView didFailWithError:(NSError *)error;

- (void)webImageManager:(SDWebImageManager *)imageManager ActivityIndicatorView:(UIActivityIndicatorView *)activityIndicatorView didFinishWithImage:(UIImage *)image drawRoundedRect:(BOOL)bDraw;

// SDImageCache中有数据

- (void)webImageManager:(SDWebImageManager *)imageManager ActivityIndicatorView:(UIActivityIndicatorView *)activityIndicatorView FileName:(NSString*)fileName didFinishWithImage:(UIImage *)image drawRoundedRect:(BOOL)bDraw;

// SDImageCache中无数据，SDWebImageDownloader下载获得

- (void)webImageManager:(SDWebImageManager *)imageManager ActivityIndicatorView:(UIActivityIndicatorView *)activityIndicatorView ImageData:(NSData *)imageData didFinishWithImage:(UIImage *)image drawRoundedRect:(BOOL)bDraw;

(UIActivityIndicatorView *)activityIndicatorView 用于显示下载状态

在ImageView调用SDWebImageManager时加载

typedef enum

{

SDWebImageRetryFailed = 1 << 0,

SDWebImageLowPriority = 1 << 1,

SDWebImageCacheMemoryOnly = 1 << 2,

SDWebImageRoundedRect = 1 << 3

} SDWebImageOptions;

中增加了SDWebImageRoundedRect用于标示是否显示圆角图片

SCGifExample增加了2个函数

- (BOOL)setGIFFile:(NSString*)gifFilePath;

- (BOOL)setGIFData:(NSData*)gifImageData;

状态栏和工具条我没有做完，状态栏最好自定义

2012-03-16:

发现了一个问题，请自行修改

UIActivityIndicatorView有可能会重复创建，会的就不需要往下看了，我只是打了个补丁

修改如下：

[cpp] view
plaincopyprint?

- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options

{

SDWebImageManager *manager = [SDWebImageManager sharedManager];

// Remove in progress downloader from queue

[manager cancelForDelegate:self];

self.image = placeholder;

if (url)

{

UIActivityIndicatorView *progressInd = (UIActivityIndicatorView *)[self viewWithTag:30326];

if (progressInd == nil)

{

progressInd = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

progressInd.tag = 30326;

[progressInd startAnimating];

[self addSubview:progressInd size:CGSizeMake(37, 37)];

[progressInd release];

}

//[manager downloadWithURL:url delegate:self options:options];

[manager downloadWithURL:url ActivityIndicatorView:progressInd delegate:self options:options];

}

}

3月23日：

SDWebImage内部有点问题，当网址链接不是image时照样返回image图片数据

可以在

NS_INLINE UIImage *SDScaledImageForPath(NSString *path, NSData *imageData)

函数中增加对imageData的判断，是否为图片数据

非时返回nil

- (void)connectionDidFinishLoading:(NSURLConnection *)aConnection

函数中再判断其值返回delegate 调用 performSelector:@selector(imageDownloader:didFailWithError:)

下载地址：点击下载

新版：点击下载

最近SDWebImage改动比较频繁，我把代码也整合了一下，简化了delegate

增加了Button部分的修改，可以设置前景背景不同状态的图片

我不做工程了，只上传SDWebImage部分

下载：SDWebImage_2.6_b78238802d.zip

好久没跟这个了发现新版SDWebImage有个大问题，会随机的阻塞下载线程导致图片不能下载成功，

老版本的那个没有问题，增加gif即可

加个gif算法：

sd_isGIF在新版SDWebImage里是有的

[cpp] view
plaincopyprint?

- (BOOL)animatedGIFWithData:(NSData *)data

{

if (!data)

{

return NO;

}

if (![data sd_isGIF])

{

return NO;

}

CGImageSourceRef source = CGImageSourceCreateWithData(( CFDataRef)data, NULL);

size_t count = CGImageSourceGetCount(source);

NSMutableArray *images = [NSMutableArray array];

NSTimeInterval duration = 0.0f;

for (size_t i = 0; i < count; i++)

{

CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);

NSDictionary *frameProperties = CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(source, i, NULL));

duration += [[[frameProperties objectForKey:(NSString*)kCGImagePropertyGIFDictionary] objectForKey:(NSString*)kCGImagePropertyGIFDelayTime] doubleValue];

[images addObject:[UIImage imageWithCGImage:image scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp]];

CGImageRelease(image);

}

CFRelease(source);

if (!duration)

{

duration = (1.0f/10.0f)*count;

}

if (images.count > 0)

{

[self setImage:[images objectAtIndex:0]];

[self setAnimationImages:images];

[self setAnimationDuration:duration];

[self setAnimationRepeatCount:0];

[self startAnimating];

return YES;

}

return NO;

}