代码实现网络接口请求数据

首先，这个只是我个人在一个已有工程中截取出来的代码块，相当于备忘录似的，对我自己来说还有点价值。

 

接口调用顺序：(以获得版本号为例)

1、首先通过[[WBNetworkEnginesharedInstance] getApplicationVertion:self];调用getApplicationVertion方法；

 方法定义如下：

- (NSUInteger)getApplicationVertion:(id<WBNetworkEngineDelegate>)delegate
{
    NSMutableDictionary * dict = [NSMutableDictionarydictionaryWithCapacity:0];  //dict包含需要传值的参素
    WBAPIRequest *req = [WBAPIHelperrequestGetAPI:APPUPDATEparameter:dict target:self];
    NSLog(@"req is %@",req);
    @synchronized(self){
        [self.delegates setObject:delegate forKey:[NSNumber numberWithUnsignedInt:(unsigned int)(req)]];   
    }
    return (NSUInteger)req;//返回网络标识符
}

2、然后又通过 [WBAPIHelper requestGetAPI:APPUPDATE parameter:dict target:self];调用+ (WBAPIRequest *)requestGetAPI:(NSString *)action parameter:(NSDictionary *)parameter target:(id)delegate方法，

定义如下：

+ (WBAPIRequest *)requestGetAPI:(NSString *)action parameter:(NSDictionary *)parameter target:(id)delegate
{
    NSMutableString * requestURL = [NSMutableString stringWithFormat:@"%@%@",BASEURL,action];//接口地址
    //添加接口所必要的参数
    for( id key in [parameter allKeys] ) {
        NSString * paramString = [WBAPIHelper stringOfParamter:key forValue:[parameter objectForKey:key]];
        [requestURL appendFormat:@"&%@",  paramString];//Adds a constructed string to the receiver.
    }
    
    //url中带中文时候的转换，否则无法创建request
    //传出过程中汉字被转换为十六进制，并且中间加上了"%"。解码时也应该用响应的编码方式进行解码
    NSString *safestring=[requestURL stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]; 

    WBAPIRequest * req = [WBAPIHelper requestBaseAPI:[NSURL URLWithString:safestring]];
    req.gcDelegate = delegate;
    [req setRequestMethod:@"GET"];//设置请求方法
    [[WBAPIHelper httpQueue] addOperation:req];// Only add ASIHTTPRequests to this queue!!
    
    return req;
}

3、方法中调用到以下三个在同一文件WBAPIHelper.m下定义的方法：

[WBAPIHelper stringOfParamter:key forValue:[parameter objectForKey:key]];

[WBAPIHelper requestBaseAPI:[NSURL URLWithString:safestring]];

[WBAPIHelperhttpQueue];

具体实现如下：

 4、继而又通过[WBAPIRequest requestWithURL:url]调用+ (WBAPIRequest *) requestWithURL:(NSURL *)url方法：并且给返回网络字符加以[req addRequestHeader:@"Content-Type" value:@"application/json"];方法。

在requestWithURL中判断是否请求成功，成功则调用- (void)requestDone:(WBAPIRequest *)req方法，失败的话调用- (void)requestError:(WBAPIRequest *)req方法；

- (void)requestDone:(WBAPIRequest *)req
{    
    NSError *err = [req error];   
    int rspCode = [req responseStatusCode];  //返回状态码
    NSLog(@"request url:%@, with method:%@", [req url], [req requestMethod]);
    NSLog(@"requst header: %@", [req requestHeaders]);

    if (!err && 200 == rspCode) {  //200:方法调用成功
        NSString *rspStr = [req responseString];
        
        //Json解析
        SBJsonParser * parser = [[SBJsonParser alloc] init];
        NSDictionary *rsp = [parser objectWithString:rspStr];
        [parser release];
         if(self.gcDelegate != nil && [self.gcDelegate respondsToSelector:@selector(request:didSuccess:)]) { 
[self.gcDelegate performSelector:@selector(request:didSuccess:) withObject:self withObject:rsp]; 

    }else{ //encounter error
        if (nil == err){
            err = [NSError errorWithDomain:@"WBErrorDomainServer" code:rspCode userInfo:nil];
        }
        if(self.gcDelegate != nil && [self.gcDelegate respondsToSelector:@selector(request:didSuccess:)]) { 
[self.gcDelegate performSelector:@selector(request:didFailed:) withObject:self withObject:err];   
    }
}

- (void)requestError:(WBAPIRequest *)req
{
    DLOG(@"request url:%@, with method:%@", [req url], [req requestMethod]);
    DLOG(@"requst header: %@", [req requestHeaders]);
    NSError *err = [req error];
    if(self.gcDelegate != nil && [self.gcDelegate respondsToSelector:@selector(request:didSuccess:)]) { 
[self.gcDelegate performSelector:@selector(request:didFailed:) withObject:self withObject:err];          
}

 

4、到这里就要分成功和失败两种情况了，成功调用- (void)request:(SMAPIRequest *)request didSuccess:(NSDictionary *)rsp方法，失败调用- (void)request:(SMAPIRequest *)request didFailed:(NSError *)error：

5、最后成功返回信息到- (void)networkEngine:(WBNetworkEngine *)engine dataReceived:(NSDictionary *)data tag:(NSUInteger)tag方法中：

#pragma mark - WBNetworkEngineDelegate methods
- (void)networkEngine:(WBNetworkEngine *)engine dataReceived:(NSDictionary *)data tag:(NSUInteger)tag
{
    //获取版本信息
    NSDictionary *dic = [NSDictionary dictionaryWithDictionary:[[[data objectForKey:@"data"] objectAtIndex:0] objectAtIndex:0]];
    NSString *serverVersion = [NSString stringWithFormat:@"%@",[dic objectForKey:@"version"]];
    NSString *currentVersion = [NSString stringWithFormat:@"%@",[[NSUserDefaults standardUserDefaults] objectForKey:@"APPLICATIONVERSION"]];
    
    //非首次进入，比较版本号
    newVersion = [serverVersion intValue];
    int  oldVersion = [currentVersion intValue];
    
    if (newVersion > oldVersion) {
        //有新版本更新，弹出更新弹出框
        UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                        message:@"有新内容，是否更新？" 
                                                       delegate:self 
                                              cancelButtonTitle:@"取消" 
                                              otherButtonTitles:@"确定", nil];
        
        [alter show];
        [alter release];
    }
}

在该委托方法中data即是请求返回的值；可对其进行相关处理。

而失败的话则在- (void)networkEngine:(WBNetworkEngine *)engine error:(NSError *)err tag:(NSUInteger)tag方法中输出错误信息即可：

- (void)networkEngine:(WBNetworkEngine *)engine error:(NSError *)err tag:(NSUInteger)tag
{
    DLOG(@"%@",err);
}

 

其中在WBAPIRequest中定义的委托：

and在定义接口地址的类文件WBNetworkEngine中定义的委托：