使用Objective-C将JSON数据发送到PHP服务器的更简单方法？

Question

我有一个PHP RESTful服务器，可以连接到该服务器，以根据从Objective-C程序调用的URL路径来调用方法。 我使用ASIHTTPRequest和SBJson 。

一切正常，但我在不同的控制器中执行请求，现在所有这些控制器中都有重复的方法。 在单个类中抽象代码（请求）的最佳方法是什么，因此我可以轻松地重用代码，从而使控制器更简单。

请从我认为是多余和重复的编码序列中解救我。

我试图创建一个单例类，但是每个视图控制器都需要不同的请求连接点，并且大多数视图控制器都要求在调用成功方法时调用特定的操作，而Im不确定如何全部处理。

这是我的代码模板当前在Objective-c程序中的外观：

//*1) Somewhere at the top of my .m file I have this*

//These are the suffixes to the URL path that I connect to at my server, 
//depending on the action required 
NSString *const RequestCreateCustomer = @"Create/Customer";
NSString *const RequestUpdateCustomer = @"Update/Customer";
NSString *const RequestDeleteCustomer = @"Delete/Customer";

//*2) Then I have my connection invocation code*

//Method invocation, all of them look something like this
-navigationButton{
...
    [self retrieveWithRequestStringType:RequestUpdateCustomer];
}

-(void)retrieveWithRequestStringType:(NSString*)typeOfRequest{

    NSLog(@"Retrieve %@ method called", typeOfRequest);
    NSString *urlString = [NSString stringWithFormat:@"%@/Secure/CB/%@", @"http://www.defaultStapleURLToMyServer.com/CB", typeOfRequest];
    NSString *encodedUrlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *url = [[NSURL alloc] initWithString:encodedUrlString];

    serverRequest = nil;
    serverRequest = [ASIFormDataRequest requestWithURL:url];
    [serverRequest addRequestHeader:@"Content-Type" value:@"application/json"];
    [serverRequest addRequestHeader:@"Request-Method" value:@"POST"];

    //Normally at this point depending on the request type, I prepare some data that needs to be sent along with the request

    NSMutableDictionary *completeDataArray = [[NSMutableDictionary alloc] init];    
    if([typeOfRequest isEqualToString:RequestCreateCustomer]){
        [serverRequest setUserInfo:[NSDictionary dictionaryWithObject:RequestCreateCustomer forKey:@"RequestType"]];
        if( ! [self validateAndPrepareAllData:&completeDataArray]){
            return;
        }

    }
    else if([typeOfRequest isEqualToString:RequestUpdateCustomer]){
        [serverRequest setUserInfo:[NSDictionary dictionaryWithObject:RequestUpdateCustomer forKey:@"RequestType"]];
        if( ! [self validateAndPrepareAllData:&completeDataArray]){
            return;
        }
    }
    else if([typeOfRequest isEqualToString:RequestDeleteCustomer]){
        [serverRequest setUserInfo:[NSDictionary dictionaryWithObject:RequestDeleteCustomer forKey:@"RequestType"]];
        if( ! [self validateAndPrepareCustomerIdData:&completeDataArray]){
            return;
        }

    }

    NSString *jsonString = [completeDataArray JSONRepresentation];
    [serverRequest appendPostData:[jsonString dataUsingEncoding:NSUTF8StringEncoding]];

    [serverRequest setDelegate:self];
    [serverRequest setDidFinishSelector:@selector(requestSucceeded:)];
    [serverRequest setDidFailSelector:@selector(requestFailed:)];
    [serverRequest startAsynchronous];
}


//*3) And heres the connection did succeed, and connection did fail methods*

-(void)requestSucceeded:(ASIHTTPRequest*)request{

    NSInteger statusCode = [[[request responseHeaders] objectForKey:@"StatusCode"] intValue];
    NSLog(@"StatusCode: %@", [[request responseHeaders] objectForKey:@"StatusCode"]);

    NSString *myString = [[NSString alloc] initWithData:[request responseData] encoding:NSUTF8StringEncoding];


    NSDictionary *JSONDictionary = [myString JSONValue];

    switch (statusCode) {
        case 400:
        case 401:
        {
            NSLog(@"display error message");
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[[request.responseString JSONValue] objectForKey:@"Message"] delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil];
            [alert show];
            break;
        }
        case 200:
            NSLog(@"status code = 200 so successful");

            //Created customer request succeeded
            if([[[request userInfo] objectForKey:@"RequestType"] isEqualToString:RequestCreateCustomer]){
                [self.delegate addedCustomerVCWithCustomer:[[CustomerDataModel alloc] initWithJSONData:[JSONDictionary objectForKey:@"CustomerObject"]]];
                [self cancelModalView];

            } 
            //Edit customer request succeeded
            else if([[[request userInfo] objectForKey:@"RequestType"] isEqualToString:RequestUpdateCustomer]){
                [self.delegate editedCustomerVCWithCustomer:[[CustomerDataModel alloc] initWithJSONData:[JSONDictionary objectForKey:@"CustomerObject"]]];
                [self cancelModalView];
            }
            //Delete customer request succeeded
            else if([[[request userInfo] objectForKey:@"RequestType"] isEqualToString:RequestDeleteCustomer]){
                [self.delegate deletedCustomer:customer];
                [self cancelModalView];
            }
            break;
        default:
            [SVProgressHUD showErrorWithStatus:[NSString stringWithFormat:@"went to none: %d or %@", (int)statusCode, [[request responseHeaders] objectForKey:@"StatusCode"]]];
            NSLog(@"went to none: %d or %@", (int)statusCode, [[request responseHeaders] objectForKey:@"StatusCode"]);
            break;
    }
    [SVProgressHUD dismiss];
}



-(void)requestFailed:(ASIHTTPRequest*)request{

    if([[[request userInfo] objectForKey:@"RquestType"] isEqualToString:RequestCreateCustomer]){
        NSLog(@"retrieving states failed so trying again");
        [self addCustomerRequest];
    }
    else if(){
       //... you get the point
    }
}

有人可以提供替代解决方案吗？

Answer 1

创建一个新的类，该类上具有块/委托（但更喜欢块）。让我们说Request.h和Request.m ..并使用block参数创建一个公共方法。

这应该是公共方法

typedef void(^CompletionBlock)(id results);
typedef void(^ErrorBlock)(NSError *error);

- (void)setCompetionBlock:(CompletionBlock)block; 和

- (void)setErrorBlock:(ErrorBlock)error;

并命名为变量。这应该是私有变量

CompletionBlock completionBlock;
ErrorBlock errorBlock;

并在您的.m中声明此方法

- (void)setCompletionBlock:(CompletionBlock)aCompletionBlock {
    completionBlock = [aCompletionBlock copy];
}

- (void)setErrorBlock:(ErrorBlock)aError {
    errorBlock = [aError copy];
}

- (void)reportSuccess:(id)results {
    if (completionBlock) {

        dispatch_async(dispatch_get_main_queue(), ^{
            completionBlock(results);
        });
    }
}

- (void)reportFailure:(NSError *)error {
    if (errorBlock) {

        dispatch_async(dispatch_get_main_queue(), ^{
            errorBlock(error);
        });
    }
}

并调用[self reportSuccess:jsonSuccess]; 在您的成功方法下，代码中的-(void)requestSucceeded:(ASIHTTPRequest*)request{和-(void)requestFailed:(ASIHTTPRequest*)request下的[self reportFailure:NSerror*]

并称这堂课

Request *req = [Request alloc]init];
[req retrieveWithRequestStringType:@"sample"];
[req setCompletion:^(id result){

}];
[req setErrorBlock:(NSError *error) {

}];