我正在使用队列使用 AFNetworking 下载一些文件。这是我的代码:
apiClient =[[AFHTTPClient alloc]initWithBaseURL: [NSURL URLWithString:ZFREMOTEHOST]];
for (NSString *element in self.productsArray) {
NSURL *url = [NSURL URLWithString:element];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
NSString *documentsDirectory = nil;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
documentsDirectory = [paths objectAtIndex:0];
NSString *targetFilename = [url lastPathComponent];
NSString *targetPath = [documentsDirectory stringByAppendingPathComponent:targetFilename];
op.outputStream = [NSOutputStream outputStreamToFileAtPath:targetPath append:NO];
[op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
//failure case
NSLog(@"BaaZ File NOT Saved %@", targetPath);
//remove the file if saved a part of it!
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager removeItemAtPath:targetPath error:&error];
if (error) {
NSLog(@"error dude");
}
if ([operation isCancelled]) {
//that doesn't work.
NSLog(@"Canceled");
}
}];
[op setDownloadProgressBlock:^(NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
if (totalBytesExpectedToRead > 0) {
dispatch_async(dispatch_get_main_queue(), ^{
self.progressView.alpha = 1;
self.progressView.progress = (float)totalBytesRead / (float)totalBytesExpectedToRead;
NSString *label = [NSString stringWithFormat:@"Downloaded %lld of %lld bytes", totalBytesRead,totalBytesExpectedToRead];
self.progressLabel.text = label;
});
}
}];
[self.resourcesArray addObject:op];
}
for (AFHTTPRequestOperation *zabols in self.resourcesArray) {
[apiClient.operationQueue addOperation:zabols];
}
该代码在文件下载时运行良好,但我想要一些取消功能,所以我有一个带有以下代码的操作按钮:
[apiClient.operationQueue cancelAllOperations];
操作取消文件,但 Documents 文件夹中有一些垃圾文件。通过说垃圾,我的意思是开始下载的文件我取消了它们,我得到了一个同名但无用的文件,因为它已损坏而无法打开。
我怎样才能防止 AF 这样做并在我取消它时只保留已完成的文件?
任何帮助将不胜感激。
还尝试通过这样的工作取消工作:
for (AFHTTPRequestOperation *ap in apiClient.operationQueue.operations) {
[ap cancel];
NSLog(@"%@",ap.responseFilePath);
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager removeItemAtPath:ap.responseFilePath error:nil];
}
并删除垃圾文件,但这也不起作用。