我想从服务器下面的代码中下载七个mp3剪辑文件,一次下载一个文件,是否有更好的方法按顺序下载所有剪辑文件。
* url从“002_001”开始,到“002_007”结束
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSString *url = @"http://www.xyzxx.com/002_001.mp3"
NSURL *URL = [NSURL URLWithString:url];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
NSLog(@"File downloaded to: %@", filePath);
//Save file in destination folder
NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"/IMCFolder"];
error = nil;
if (![[NSFileManager defaultManager] fileExistsAtPath:stringPath])
[[NSFileManager defaultManager] createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:&error];
NSData *data = [NSData dataWithContentsOfURL:filePath];
if(data)
{
stringPath = [stringPath stringByAppendingPathComponent:[URL lastPathComponent]];
[data writeToFile:stringPath atomically:YES];
}
}];
[downloadTask resume];
最佳答案
您应该创建一个串行队列,我正在使用GCD,dispatch_queue_t _queue = dispatch_queue_create("myQueue", DISPATCH_QUEUE_SERIAL);
,然后使用
dispatch_sync(_queue, ^{
NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
// some code
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
//some code
}});
您在串行队列中创建每个任务,它们将按顺序执行。
关于ios - 在ios中按顺序下载音频文件,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/25594001/