AFHTTPRequestOperationManager在块中返回数据

时间:2014-03-22 17:24:42

标签: objective-c afnetworking objective-c-blocks afnetworking-2 afhttprequestoperation

我在我的应用程序中创建了一个APIController,它有几个调用特定api url的方法,并返回一个填充了api调用结果的模型对象。

api适用于json,到目前为止,我的代码如下所示:

//Definition:
- (MyModel *)callXYZ;
- (MyModel *)callABC;
- (MyModel *)call123;

//Implementation of one:
- (MyModel *)callXYZ {

    //Build url and call with [NSData dataWithContentsOfURL: url];
    //Create model and assign data returned by api

    return model;

}

现在我想使用优秀的AFNetworking框架来摆脱那个“dataWithContentsOfURL”调用。所以我改变了我的方法:

- (MyModel *)callXYZ {
    __block MyModel *m;
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    [manager GET:urlString parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
        //process data and assign to model m
    }
    return m;
}

此代码无效,因为在url调用完成之前返回空模型。我被困住了,不知道如何重构我的设计以使其发挥作用。

//编辑:我不知道知道是否重要,但我后来想要在调用api时显示加载动画。

1 个答案:

答案 0 :(得分:2)

- (void)callXYZWithCompletion:(void (^)(MyModel *model))completion {
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    [manager GET:urlString parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
        MyModel *m;
        //process data and assign to model m

        if(completion) {
            completion(m);
        }
    }
}

用法示例:

// Start the animation

[self callXYZWithCompletion:^(MyModel *model) {
    // Stop the animation
    // and use returned model here
}];