ios - afnetworking3.0 如何实现多任务并行请求数据

Question

如题,afnetworking更新到3.0后,如何实现多任务请求数据

Answer 1

You can download it through Group, use dispath_group_enter() and dispath_group_leave() to put the thread into the group, use dispath_group_notify to monitor whether the task has been downloaded, do not use dispath_group_wait to monitor, because dispath_group_wait will block the thread.

I wrote an example below:

NSString *urlStr1 = @"url1";
NSString *urlStr2 = @"url2";
NSString *urlStr3 = @"url3";
NSArray *urlStrings = @[urlStr1, urlStr2, urlStr3];

dispath_group_t requestGroup = dispath_group_create();

for(NSString urlString in urlStrings) {  
    dispatch_group_enter(requestGroup);
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    [manager GET:urlString parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    
        NSLog(@"Success");
        dispatch_group_leave(requestGroup);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
     
        NSLog(@"Error: %@", error);
        dispatch_group_leave(requestGroup);
    }];
}
dispatch_group_notify(requestGroup, dispatch_get_main_queue(), ^{
 
        //doSomething
});

I did it with all my hands, I hope I can give you a good review^_^
This method seems a bit troublesome, if any master has a better method, I hope to share it