AFNetworking檢查是否緩存了圖像

Question

我有這種方法，當單擊單元格時，它將為UIImageView下載完整大小的圖像。

- (void)configureView
{
    NSURLRequest *URLRequest = [[NSURLRequest alloc] initWithURL:self.imageURL];

    AFImageRequestOperation *operation = [[AFImageRequestOperation alloc] initWithRequest:URLRequest];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

            [SVProgressHUD showSuccessWithStatus:@"Done!"];

        [self.imageView setImage:responseObject];
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];

    [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
        float percentage = (totalBytesRead / (totalBytesExpectedToRead * 1.0f) * 100);
        NSLog(@"Percentage: %f", percentage);
        if (percentage != 100.0)
        {
            [SVProgressHUD showWithStatus:[NSString stringWithFormat:@"Downloading... %0.0f%%", percentage]];
        }
    }];

    [operation start];
}

因此，下載完成后， [SVProgressHUD showSuccessWithStatus:@"Done!"]; 叫做。 但是，當您返回tableViewController並單擊相同的單元格時， [SVProgressHUD showSuccessWithStatus:@"Done!"]; 即使圖像已緩存，也會再次調用。 如何檢查圖像是否已緩存並且僅調用[SVProgressHUD showSuccessWithStatus:@"Done!"]; 什么時候不？

Answer 1

AFImageRequestOperation不緩存圖像。 我認為您將AFNetworking的類別“ UIImageView + AFNetworking”與“ AFImageRequestOperation”混淆了。 類別不緩存圖像，AFImageRequestOperation不緩存圖像。