之前使用的是的SDWebImage来加载的gif图片，后来更新了SDWebImage，gif图片就无法使用，只能默认选择了第一张图片。
查看了新的SDWebImage中的UIImage+GIF，发现原来最新的代码中做了限制+ (UIImage *)sd_animatedGIFWithData:(NSData *)data方法中限制使用gif图片了，必须要使用FLAnimatedImageView三方的imagview展示才可以。
如果使用老版本的SDWebImage中的uiimage + gif类，当你调用+ (UIImage *)sd_animatedGIFNamed:(NSString *)name;方法的时候，他会默认调最新的+ (UIImage *)sd_animatedGIFWithData:(NSData *)data这个方法。（我用的是pods）
还有一种解决办法就是，我更换了uiimage+gif方法（就解决了……）
#import <UIKit/UIKit.h>
typedef void (^GIFimageBlock)(UIImage *GIFImage);
@interface UIImage (GIF)
/** 根据本地GIF图片名 获得GIF image对象 */
+ (UIImage *)imageWithGIFNamed:(NSString *)name;
/** 根据一个GIF图片的data数据 获得GIF image对象 */
+ (UIImage *)imageWithGIFData:(NSData *)data;
/** 根据一个GIF图片的URL 获得GIF image对象 */
+ (void)imageWithGIFUrl:(NSString *)url and:(GIFimageBlock)gifImageBlock;
@end
#import "UIImage+GIF.h"
#import <ImageIO/ImageIO.h>
@implementation UIImage (GIF)
+ (UIImage *)imageWithGIFData:(NSData *)data
{
if (!data) return nil;
CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
size_t count = CGImageSourceGetCount(source);
UIImage *animatedImage;
if (count <= 1) {
animatedImage = [[UIImage alloc] initWithData:data];
} else {
NSMutableArray *images = [NSMutableArray array];
NSTimeInterval duration = 0.0f;
for (size_t i = 0; i < count; i++) {
// 拿出了Gif的每一帧图片
CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
//Learning... 设置动画时长 算出每一帧显示的时长(帧时长)
NSTimeInterval frameDuration = [UIImage sd_frameDurationAtIndex:i source:source];
duration += frameDuration;
// 将每帧图片添加到数组中
[images addObject:[UIImage imageWithCGImage:image scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp]];
// 释放真图片对象
CFRelease(image);
}
// 设置动画时长
if (!duration) {
duration = (1.0f / 10.0f) * count;
}
animatedImage = [UIImage animatedImageWithImages:images duration:duration];
}
// 释放源Gif图片
CFRelease(source);
return animatedImage;
}
+ (UIImage *)imageWithGIFNamed:(NSString *)name
{
NSUInteger scale = (NSUInteger)[UIScreen mainScreen].scale;
return [self GIFName:name scale:scale];
}
+ (UIImage *)GIFName:(NSString *)name scale:(NSUInteger)scale
{
NSString *imagePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%@@%zdx", name, scale] ofType:@"gif"];
if (!imagePath) {
(scale + 1 > 3) ? (scale -= 1) : (scale += 1);
imagePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%@@%zdx", name, scale] ofType:@"gif"];
}
if (imagePath) {
// 传入图片名(不包含@Nx)
NSData *imageData = [NSData dataWithContentsOfFile:imagePath];
return [UIImage imageWithGIFData:imageData];
} else {
imagePath = [[NSBundle mainBundle] pathForResource:name ofType:@"gif"];
if (imagePath) {
// 传入的图片名已包含@Nx or 传入图片只有一张 不分@Nx
NSData *imageData = [NSData dataWithContentsOfFile:imagePath];
return [UIImage imageWithGIFData:imageData];
} else {
// 不是一张GIF图片(后缀不是gif)
return [UIImage imageNamed:name];
}
}
}
+ (void)imageWithGIFUrl:(NSString *)url and:(GIFimageBlock)gifImageBlock
{
NSURL *GIFUrl = [NSURL URLWithString:url];
if (!GIFUrl) return;
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSData *CIFData = [NSData dataWithContentsOfURL:GIFUrl];
// 刷新UI在主线程
dispatch_async(dispatch_get_main_queue(), ^{
gifImageBlock([UIImage imageWithGIFData:CIFData]);
});
});
}
#pragma mark - <关于GIF图片帧时长(Learning...)>
+ (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
float frameDuration = 0.1f;
CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary];
NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
if (delayTimeUnclampedProp) {
frameDuration = [delayTimeUnclampedProp floatValue];
}
else {
NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime];
if (delayTimeProp) {
frameDuration = [delayTimeProp floatValue];
}
}
// Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
// We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
// a duration of <= 10 ms. See and
// for more information.
if (frameDuration < 0.011f) {
frameDuration = 0.100f;
}
CFRelease(cfFrameProperties);
return frameDuration;
}
@end
