Question

我正在使用ASIHTTPRequest框架在我的iOS应用程序中进行网络调用。但我不想直接在我的应用程序中的所有控制器中使用它。所以我想到围绕ASIHTTPRequest编写一个图层。我的代码使用此层来使用ASIHTTPRequest。将来的好处我应该能够用其他框架替换这个框架，我的代码将保持不变，只是图层会改变。我想知道应该采取什么策略。我应该从ASIHTTPRequest类继承我的类，还是实现我自己的类。应该考虑实施的方法应该是什么。

目前我正在这样实施。我的包装是

MyRequestHandler.h : NSObject       
@property ASIHTTPRequest *asiHttpReq;    

-(void) sendAsyncGetRequest
{
    self.asiRequest = [ASIHTTPRequest requestWithURL:self.url];
    if(self.tag != 0){
        self.asiRequest.tag = self.tag;
    }
    [self.asiRequest setDelegate:self];
    [self.asiRequest startAsynchronous];        
}

- (void)requestFinished:(ASIHTTPRequest *)request{
     MyResponseObj *respone = <From request obj>
     if([delegate respondsToSelector:@selector(requestFinished:)]){
            [delegate performSelector:@selector(requestFinished:) withObject:response];
        }
 }

在我的viewcontroller中，我会这样做：

MyViewController.h : UIViewContoller
@property MyRequestHandler *reqHandler;

-(void) fireRequest
{
NSString* requestUrl = <create URL>;
if(requestUrl){

    // [self showLoadingIndicatorView];

    // Proceed for request.
    NSURL *url = [NSURL URLWithString:requestUrl];
    reqHandler = [MyRequestHandler requestWithURL:url];
    reqHandler.tag = 1000;
    [reqHandler setDelegate:self];
    [reqHandler sendAsyncGetRequest];
}
}

- (void)requestFinished:(MyResponse*) responseData{
        // Do Your parsing n all here.
}

- (void)requestFailed:(MyResponse*) responseData{
        // Handle the error here.
}

这是正确的做法吗？这里的问题是因为我在viewcontroller中创建了myrequesthandler的属性我一次只能发出一个请求，并且失去ASIHTTPRequest同时发出多个请求的能力。

你能建议我如何处理这样的问题。

Answer 1

这就是我正在使用的：

#import "ASIFormDataRequest.h"

@interface RequestPerformer : NSObject {
    id localCopy; // to avoid exec_bad_access with arc
    ASIHTTPRequest *getRequest;
    ASIFormDataRequest *postRequest;
}

@property (nonatomic, retain) id delegate;
@property (nonatomic, readwrite) SEL callback;
@property (nonatomic, readwrite) SEL errorCallback;

- (void)performGetRequestWithString:(NSString *)string stringDictionary:(NSDictionary *)stringDictionary delegate:(id)requestDelegate requestSelector:(SEL)requestSelector errorSelector:(SEL)errorSelector;
- (void)performPostRequestWithString:(NSString *)string stringDictionary:(NSDictionary *)stringDictionary dataDictionary:(NSDictionary *)dataDictionary delegate:(id)requestDelegate requestSelector:(SEL)requestSelector errorSelector:(SEL)errorSelector;

@end

//

#import "RequestPerformer.h"
#import "ASIHTTPRequest.h"
#import "ASIFormDataRequest.h"

@implementation RequestPerformer

@synthesize delegate;
@synthesize callback, errorCallback;

- (void)performGetRequestWithString:(NSString *)string stringDictionary:(NSDictionary *)stringDictionary delegate:(id)requestDelegate requestSelector:(SEL)requestSelector errorSelector:(SEL)errorSelector {

    localCopy = self;

    self.delegate = requestDelegate;
    self.callback = requestSelector;
    self.errorCallback = errorSelector;

    NSMutableString *requestStringData = [[NSMutableString alloc] init];
    if (stringDictionary)
        for (NSString *key in [stringDictionary allKeys])
            [requestStringData appendFormat:@"%@=%@&", key, [stringDictionary objectForKey:key]];
    NSString *resultString = [requestStringData substringToIndex:[requestStringData length]-1];

    getRequest = [[ASIFormDataRequest alloc] initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@?%@", string, [resultString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]];
    [getRequest setDelegate:self];
    [getRequest setRequestMethod:@"GET"];

    //NSLog(@"request url = %@", [getRequest.url absoluteString]);
    [getRequest startAsynchronous];
}

- (void)performPostRequestWithString:(NSString *)string stringDictionary:(NSDictionary *)stringDictionary dataDictionary:(NSDictionary *)dataDictionary delegate:(id)requestDelegate requestSelector:(SEL)requestSelector errorSelector:(SEL)errorSelector {

    localCopy = self;

    self.delegate = requestDelegate;
    self.callback = requestSelector;
    self.errorCallback = errorSelector;

    NSURL *url = [NSURL URLWithString:string];

    postRequest = [[ASIFormDataRequest alloc] initWithURL:url];
    [postRequest setDelegate:self];
    [postRequest setRequestMethod:@"POST"];

    if (stringDictionary)
        for (NSString *key in [stringDictionary allKeys])
            [postRequest setPostValue:[stringDictionary objectForKey:key] forKey:key];

    if (dataDictionary)
        for (NSString *key in [dataDictionary allKeys])
            [postRequest setData:[dataDictionary objectForKey:key] forKey:key];

    //NSLog(@"request url = %@", [postRequest.url absoluteString]);
    [postRequest startAsynchronous];
}

#pragma mark - ASIHTTPRequest Delegate Implementation

- (void)requestFinished:(ASIHTTPRequest *)crequest {
    NSString *status = [crequest responseString];

    if (self.delegate && self.callback) {
        if([self.delegate respondsToSelector:self.callback])
            [self.delegate performSelectorOnMainThread:self.callback withObject:status waitUntilDone:YES];
        else
            NSLog(@"No response from delegate");
    }
    localCopy = nil;
}
- (void)requestFailed:(ASIHTTPRequest *)crequest {
    if (self.delegate && self.errorCallback) {
        if([self.delegate respondsToSelector:self.errorCallback])
            [self.delegate performSelectorOnMainThread:self.errorCallback withObject:crequest.error waitUntilDone:YES];
        else
            NSLog(@"No response from delegate");
    }
    localCopy = nil;
}

@end

要使用它，只需在RequestPerformer.h中导入UIViewController并执行以下操作：

[requestManager performGetRequestWithString:tempString stringDictionary:stringDictionary dataDictionary:dataDictionary delegate:self requestSelector:@selector(requestSucceeded:) errorSelector:@selector(requestFailed:)];

参数：

(NSString *)string - url字符串，发布请求的位置;
(NSDictionary *)stringDictionary - 字典，其中包含所有内容文字信息（如姓名，身份证等）;
(NSDictionary *)dataDictionary - 字典，包含所有数据信息（如照片，文件等）;
(id)requestDelegate - 委托执行以下选择器;
(SEL)requestSelector - 选择器，将在成功请求时执行;
(SEL)errorSelector - 选择器，会在发生错误时执行。

Answer 2

在上面的回答（demon9733）中，包装类已经用retain创建了delegate属性。通常，应该指定委托属性以删除保留周期。

围绕ASIHTTPRequest的包装

2 个答案: