Question

我正在学习使用AFNetworking并执行GET请求。

AFNetworking (3.1.0)

XCode 6

代码：

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager GET:@"http://localhost:5000/index" parameters:nil progress:nil success:^(NSURLSessionTask *task, id responseObject) {
        NSLog(@"JSON: %@", responseObject);
    } failure:^(NSURLSessionTask *operation, NSError *error) {
        NSLog(@"Error: %@", error)p;
    }];

然而，我收到了错误

不兼容的块指针类型发送＆＃39; void（^）（NSURLSessionTask * __ strong，NSError * __ strong）＆＃39;参数类型＆＃39; void（^ __nullable）（NSURLSessionDataTask * __nonnull __strong）＆＃39;

多次尝试但无法找出原因？

Answer 1

最后我发现问题确实是错误的版本Xcode。在Xcode 6中，它无法识别nullable。升级我的Xcode只是解决了问题。

Answer 2

我认为你的参数值不发送nil值，我也使用afNetworking Get方法，请参考下面的代码，

viewDidLoad给出以下代码：

NSURL *url = [NSURL URLWithString:@"http://localhost:5000/index"];

    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    //AFNetworking asynchronous url request
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

    operation.responseSerializer = [AFJSONResponseSerializer serializer];
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        movies = [responseObject objectForKey:@"enquiry"];

        NSSortDescriptor *titleSort = [[NSSortDescriptor alloc] initWithKey:@"FirstName"
                                                                  ascending:YES selector:@selector(caseInsensitiveCompare:)];
//        NSMutableArray *sortDescriptors = [[NSMutableArray alloc] initWithObjects: titleSort, nil];
        movies=[NSMutableArray arrayWithArray:[movies sortedArrayUsingDescriptors:@[titleSort]]];

        NSLog(@"The Array: %@",movies);
        [self.mytableView reloadData];

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        NSLog(@"Request Failed: %@, %@", error, error.userInfo);

    }];

    [operation start];

不要忘记标题中的#import "AFNetworking.h" 希望它有用

iOS - AFNetworking GET方法中不兼容的块指针类型

2 个答案: