清除PHCachingImageManager中的缓存

Question

我希望从PHCachingImageManager清除缓存，因为每当我获取新的高分辨率图像时，它会将内存增加大约3-4 Mb，具体取决于图像的大小，并最终导致应用崩溃。

这是我用来缓存图片的代码：

PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
options.synchronous = YES;
options.networkAccessAllowed = YES;

self.cachingManager = [PHCachingImageManager new];
self.cachingManager.allowsCachingHighQualityImages = YES;

[self.cachingManager startCachingImagesForAssets:self.allAssets targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:options];

这就是我要求提供图像的方式：

[self.cachingManager requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
    imageView.image = result;
}];