从网络上下载大文件(视频)

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
self.receivedData = [[NSMutableData alloc]init];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
[self.receivedData appendData:data];
NSLog(@"接受到服务器端来的数据%d",data.length);
NSString *Data =[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"%@",Data);
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection{

NSLog(@"222");

NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/a.mp4"];
NSLog(@"string = %@",path);
[self.receivedData writeToFile:path atomically:YES];
}