Question

我想知道如何从不同的类调用AFHTTPSessionManagern。目前我使用此代码来获取响应，但我不知道如何将其转换为需要参数和回发链接的单例类。我只接收和处理JSON代码。

static NSString * const BaseURLString = @"http://www.example.com/";
NSURL *baseURL = [NSURL URLWithString:BaseURLString];

NSDictionary *parameters = @{ @"Token" : @"123456"};

AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithBaseURL:baseURL];
manager.responseSerializer = [AFJSONResponseSerializer serializer];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];

[manager GET:@"/list-21.aspx?" parameters:parameters success:^(NSURLSessionDataTask *task, id responseObject) {
    self.someDictionary = responseObject[@"User"];
    [self.tableView reloadData];

} failure:^(NSURLSessionDataTask *task, NSError *error) {
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Films"
                                                        message:[error localizedDescription]
                                                       delegate:nil
                                              cancelButtonTitle:@"Ok"
                                              otherButtonTitles:nil];
    [alertView show];
}];

Answer 1

您可以使用委派方法。

创建一个单独的类（Sync.h和Sync.m），它只包含上面创建AFHTTPSessionManager，参数和启动连接的代码。在此类中创建委托方法。现在从你的其他类（mainController），创建一个上面的类和sync.delegate = self的对象。一旦收到repsonse /错误。委托在mainController中实现的已定义方法。

以下是示例： SyncManager.h

#import <UIKit/UIKit.h>
@protocol SyncDelegate<NSObject>

-(void)syncSuccess:(id) responseObject;
-(void)syncFailure:(NSError*) error;

@end

@interface SyncManager: UIViewController
{
}

-(void) serviceCall:(NSString*)url withParams:(NSDictionary*) params;
@end

SyncManager.m

@interface SyncManager ()

@end

@implementation SyncManager 

-(void) serviceCall:(NSString*)url withParams:(NSDictionary*) params {
    NSURL *baseURL = [NSURL URLWithString:url];
    AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithBaseURL:baseURL];
    manager.responseSerializer = [AFJSONResponseSerializer serializer];
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
    [manager GET:@"/list-21.aspx?" parameters:parameters success:^(NSURLSessionDataTask *task, id      responseObject) {
        [self.delegate syncSuccess:responseObject];
    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        [self.delegate syncFailure:error];
    }];
}
@end

ViewController.m

-(void)fetchdata {
    NSDictionary *dictionary = @{@"name":@"Arun"};
    SyncManager *sync = [[SyncManager alloc] init];
    sync.delegate = self;
    [sync serviceCall:@"www.google.com" withparams:dictionary]; 
}

-(void)syncSuccess:(id) responseObject {
    // Parse your data
}

-(void)syncFailure:(NSError*) error {
    //display Error
}

Answer 2

您可以使用NSNotificationCenter并通过它传递响应。这有额外的好处，即多个班级可以同时收听。如果数据影响UI，则会为他们提供相应更新的机会。

[manager GET:@"/list-21.aspx?" parameters:parameters success:^(NSURLSessionDataTask *task, id responseObject) {
    self.someDictionary = responseObject[@"User"];
    [self.tableView reloadData];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"USER_DATA_ARRIVED" object:responseObject[@"User"]];

} failure:^(NSURLSessionDataTask *task, NSError *error) {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"USER_DATA_ARRIVED" object:nil];

    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Films"
                                                    message:[error localizedDescription]
                                                   delegate:nil
                                          cancelButtonTitle:@"Ok"
                                          otherButtonTitles:nil];
    [alertView show];
}];

添加通知名称的观察者，数据将包含在notification.object中，如果失败则为零

AFNetworking 2.0 - 如何在成功时将响应传递给另一个类

2 个答案: