iOS 网络GIF加载第三方库对比

SDWebImage库自带的gif图加载方法

UIImageView *sdimageView = [[UIImageView alloc]init];
    [sdimageView sd_internalSetImageWithURL:[NSURL URLWithString:@"https://i.pinimg.com/originals/07/44/38/074438e7c75034df2dcf37ba1057803e.gif"] placeholderImage:nil options:0 context:nil setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
        [sdimageView setImage:[UIImage sd_imageWithGIFData:imageData]];
    } progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
        
    } completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
        
    }];
    sdimageView.frame = CGRectMake(0, 0, 400, 300);
    sdimageView.center = self.view.center;
    [self.view addSubview:sdimageView];

动画很流畅，满帧运行，但是内存占用是真的大，如下图所示

FLanimatedImage 库

FLAnimatedImageView *sdimageView = [[FLAnimatedImageView alloc]init];
    [sdimageView sd_internalSetImageWithURL:[NSURL URLWithString:@"https://i.pinimg.com/originals/07/44/38/074438e7c75034df2dcf37ba1057803e.gif"] placeholderImage:nil options:0 context:nil setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
//        [sdimageView setImage:[UIImage sd_imageWithGIFData:imageData]];
        sdimageView.animatedImage = [[FLAnimatedImage alloc]initWithAnimatedGIFData:imageData];
    } progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {

    } completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {

    }];
    sdimageView.frame = CGRectMake(0, 0, 400, 300);
    sdimageView.center = self.view.center;
    [self.view addSubview:sdimageView];

掉帧严重，播放速度明显变慢了很多，但是内存和CPU占用率比较合理

AsyncDisplayKit（Texture库）

ASNetworkImageNode *imageNode = [[ASNetworkImageNode alloc] init];
    imageNode.URL = [NSURL URLWithString:@"https://i.pinimg.com/originals/07/44/38/074438e7c75034df2dcf37ba1057803e.gif"];
    // Uncomment to see animated webp support
    //  imageNode.URL = [NSURL URLWithString:@"https://storage.googleapis.com/downloads.webmproject.org/webp/images/dancing_banana2.lossless.webp"];
    imageNode.frame = self.view.bounds;
    imageNode.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    imageNode.contentMode = UIViewContentModeScaleAspectFit;

    [self.view addSubnode:imageNode];

轻微掉帧，播放比较流畅，内存占用如下

总结

对于大部分网络Gif图来说，不建议使用SDwebimage自带的加载方式，因为指不定配置的图片帧数过多或者分辨率大一点，线上用户内存就爆了

1. 如果gif图没有那么大，帧数不高，可以使用FlanimationImage这个轻量级框架
2. 超大GIF和高帧率，可以考虑引入Texture 库，这个库比较庞大，GIF图只是其冰山一角