-(void)downImage
{
AlbumInfo *info = [self.dataArray objectAtIndex:index];
NSString *filePath = [[SandBoxPath pathForCaches]stringByAppendingPathComponent:@"/a.png"];
[self showLoadingView];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:info.url]];
AFDownloadRequestOperation *downloadOperation = [[AFDownloadRequestOperation alloc]initWithRequest:request targetPath:filePath shouldResume:NO];
[downloadOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
[self hideLoadingView];
UIImage *image = [UIImage imageWithContentsOfFile:filePath];
if (image) {
UIImageWriteToSavedPhotosAlbum(image, self, nil, NULL);
[self showToast:@"保存成功！"];
}else{
[self showToast:@"保存失败！"];
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[self hideLoadingView];
[self showToast:@"保存失败！"];
}];
[downloadOperation setProgressiveDownloadProgressBlock:^(AFDownloadRequestOperation *operation, NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpected, long long totalBytesReadForFile, long long totalBytesExpectedToReadForFile) {
TTLog(@"bytesread: %d",bytesRead);
}];
NSOperationQueue *downloadQueue = [[NSOperationQueue alloc]init];
[downloadQueue addOperation:downloadOperation];
}