使用SDWebImage下载高分辨率图时，导致内存memory暴

最近在做公司项目中，发现用sd_setImageWithURL：加载图片的时候，内存会保证，通过instrument调试工具发现：

instrument分析图

代码定位

image
在解压缩的时候，出现内存飙升

解决方案
1、首先在封装的控制器中定义变量用于存储原设置：

static BOOL SDImageCacheOldShouldDecompressImages = YES;
static BOOL SDImagedownloderOldShouldDecompressImages = YES;

2、loadView中保存原设置并且禁用解压缩

- (void)loadView {
    [super loadView];
    SDImageCache *canche = [SDImageCache sharedImageCache];
    SDImageCacheOldShouldDecompressImages = canche.shouldDecompressImages;
    canche.shouldDecompressImages = NO;
    
    SDWebImageDownloader *downloder = [SDWebImageDownloader sharedDownloader];
    SDImagedownloderOldShouldDecompressImages = downloder.shouldDecompressImages;
    downloder.shouldDecompressImages = NO;
}

3、delloc中恢复原设置：

-(void)dealloc {
    SDImageCache *canche = [SDImageCache sharedImageCache];
    canche.shouldDecompressImages = SDImageCacheOldShouldDecompressImages;

    SDWebImageDownloader *downloder = [SDWebImageDownloader sharedDownloader];
    downloder.shouldDecompressImages = SDImagedownloderOldShouldDecompressImages;
}

再次用instrument跑了一下，方法果然有效，内存彻底降下来了，如图：

image