iOS直接缓存数据的网络请求库封装(利用AF3.0&YYCache)

前言:
开发中我们经常需要缓存某个界面的数据,那么我们如果在每个界面都去写这样的缓存代码就会变得非常繁琐...于是,一直在考虑封装一个自己的自带缓存功能的网络请求库.....
首先说明下,需要用到哪些第三方库...主要是AFNetWoking 3.0(主要用于请求网络数据),YYCache(主要用于生成缓存到内存和硬盘,更新和删除缓存等操作).
这里的YYCache底层实现,他会将数据缓存在内存中,和磁盘上,当数据量少的时候,是直接存在本地数据库.db中,数据量大的话,会以文件的形式存放
下面只是部分代码实现....详细的,请看我gitHub上的demo 希望大家多多指教
链接地址如下
https://github.com/BrightMoment/D-Y/tree/master/HttpWithCacheDemo

1.先看下网络请求类的.h文件(HttpRequestWithCache.h)

#import <Foundation/Foundation.h>

//连接可自己替换
#define urlStr @"http://192.168.0.199:8888/yuyue_m/"

@protocol HttpRequestCacheDelegate <NSObject>

@optional
-(void)httpSuccess:(id)response bindTag:(NSString *)bindTag;

-(void)httpError:(NSString *)error bindTag:(NSString *)bindTag;

@end

@interface HttpRequestWithCache : NSObject

-(instancetype)initWithDelegate:(id)requestDelegate bindTag:(NSString *)bindTag needToken:(NSInteger)needToken;

@property (nonatomic,assign)  id requestDelegate;
@property (nonatomic,copy)  NSString *bindTag;
@property (nonatomic,assign)  NSInteger needToken;

#pragma mark - Get方法(默认方法)
//不带缓存
-(void)httpGetRequest:(NSString *)api params:(NSMutableDictionary *)params;
-(void)httpGetCacheRequest:(NSString *)api params:(NSMutableDictionary *)params;
#pragma mark - Post方法
//不带缓存
-(void)httpPostRequest:(NSString *)api params:(NSMutableDictionary *)params;
-(void)httpPostCacheRequest:(NSString *)api params:(NSMutableDictionary *)params;

#pragma mark - 上传文件方法
//上传单张图片
-(void)upLoadDataWithUrlStr:(NSString *)api params:(NSMutableDictionary *)params imageKey:(NSString *)name withData:(NSData *)data;
//上传多张图片
-(void)upLoadDataWithUrlStr:(NSString *)api params:(NSMutableDictionary *)params  withDataArray:(NSArray *)dataArray;

@end

上面代码中方法写的很明确,携带Cache的方法,就是可以对从服务器拿到的数据进行缓存的方法,
2.这些方法的具体实现,我们来看下.m文件

#import "HttpRequestWithCache.h"
#import "AFNetworking.h"
#import "YYCache.h"

//YYCache缓存文件存放的文件夹
NSString * const HttpCache = @"HttpRequestCache";
#define DYLog(...) NSLog(__VA_ARGS__)  //如果不需要打印数据, 注释掉NSLog

// 请求方式
typedef NS_ENUM(NSInteger, RequestType) {
    RequestTypeGet,
    RequestTypePost,
    RequestTypeUpLoad,//单个上传
    RequestTypeMultiUpload,//多个上传
    RequestTypeDownload
};

@implementation HttpRequestWithCache
{
    __weak HttpRequestWithCache *weakSelf;

}
-(instancetype)initWithDelegate:(id)requestDelegate bindTag:(NSString *)bindTag needToken:(NSInteger)needToken
{
    if (self =[super init]) {
        self.requestDelegate=requestDelegate;
        self.bindTag=bindTag;
        self.needToken=needToken;
        weakSelf=self;
    }
    return self;
}

#pragma mark - Get方法(默认方法)

//不带缓存
-(void)httpGetRequest:(NSString *)api params:(NSMutableDictionary *)params
{
    [self httpRequestWithUrlStr:api params:params requestType:RequestTypeGet isCache:NO cacheKey:nil imageKey:nil withData:nil withDataArray:nil];
}

-(void)httpGetCacheRequest:(NSString *)api params:(NSMutableDictionary *)params
{
   [self httpRequestWithUrlStr:api params:params requestType:RequestTypeGet isCache:YES cacheKey:[urlStr stringByAppendingString:api] imageKey:nil withData:nil withDataArray:nil];
}

#pragma mark - Post方法
//不带缓存
-(void)httpPostRequest:(NSString *)api params:(NSMutableDictionary *)params
{
    [self httpRequestWithUrlStr:api params:params requestType:RequestTypePost isCache:NO cacheKey:nil imageKey:nil withData:nil withDataArray:nil];
}

-(void)httpPostCacheRequest:(NSString *)api params:(NSMutableDictionary *)params
{
    [self httpRequestWithUrlStr:api params:params requestType:RequestTypePost isCache:YES cacheKey:[urlStr stringByAppendingString:api] imageKey:nil withData:nil withDataArray:nil];
}

#pragma mark - 上传文件方法
//上传单张图片 name一般写file
-(void)upLoadDataWithUrlStr:(NSString *)api params:(NSMutableDictionary *)params imageKey:(NSString *)name withData:(NSData *)data
{
   [self httpRequestWithUrlStr:api params:params requestType:RequestTypeUpLoad isCache:NO cacheKey:[urlStr stringByAppendingString:api] imageKey:name withData:data withDataArray:nil];
}

//上传多张图片
-(void)upLoadDataWithUrlStr:(NSString *)api params:(NSMutableDictionary *)params  withDataArray:(NSArray *)dataArray
{
    [self httpRequestWithUrlStr:api params:params requestType:RequestTypeUpLoad isCache:NO cacheKey:[urlStr stringByAppendingString:api] imageKey:nil withData:nil withDataArray:dataArray];
}

#pragma mark - 网络请求统一处理
/**
 *
 *
 *  @param api         后台的接口名
 *  @param params      参数dict
 *  @param requestType 请求类型
 *  @param isCache     是否缓存标志
 *  @param cacheKey    缓存的对应key值
 *  @param name        图片上传的名字(upload)
 *  @param data        图片的二进制数据(upload)
 *  @param dataArray   多图片上传时的imageDataArray
 */
-(void)httpRequestWithUrlStr:(NSString *)api params:(NSMutableDictionary *)params requestType:(RequestType)requestType isCache:(BOOL)isCache cacheKey:(NSString *)cacheKey imageKey:(NSString *)name withData:(NSData *)data withDataArray:(NSArray *)dataArray
{
    NSString *url=[NSString stringWithFormat:@"%@%@",urlStr,api];
    url=[url stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    
    if (params==nil) {
        params=[NSMutableDictionary dictionary];
    }
    
    NSString *token=[[NSUserDefaults standardUserDefaults] objectForKey:@"token"];
    NSLog(@"token:%@",token);
    token=(token==nil)?@"":token;
    
    //是否需要token
    if(self.needToken)
    {
        //未登录提示登录操作
//        if([token isEqualToString:@""])
//        {
//            
//            
//            [[AppDelegate sharedAppDelegate]presentToLoginView:self._delegate success:^{
//                //登录成功之后,继续刚才未完成的 接口操作
//                [weakSelf updateImage:api params:params WithImageData:imageData];
//            }];
//            return;
//        }
        [params setObject:token forKey:@"token"];
    }
    
    NSString *allUrl=[self urlDictToStringWithUrlStr:url WithDict:params];
    DYLog(@"\\n\\n 网址 \\n\\n      %@    \\n\\n 网址 \\n\\n",allUrl);
    
    //设置YYCache属性
    YYCache *cache = [[YYCache alloc] initWithName:HttpCache];
    
    cache.memoryCache.shouldRemoveAllObjectsOnMemoryWarning = YES;
    cache.memoryCache.shouldRemoveAllObjectsWhenEnteringBackground = YES;
    
    id cacheData;
    /* 此处要修改为,服务端不要求重新拉取数据时执行;注意当缓存没取到时,重新访问接口
    if (isCache) {
        
        //根据网址从Cache中取数据
        cacheData = [cache objectForKey:cacheKey];
        if(cacheData!=nil)
        {
            //将数据统一处理
            [self returnDataWithRequestData:cacheData];
        }
    }
    */
    //进行网络检查
    if (![self requestBeforeJudgeConnect])
    {
        //断网
//        [self showError:@"请检查网络连接"];
       DYLog(@"\\n\\n----%@------\\n\\n",@"没有网络");
        //断网后,根据网址从Cache中取数据进行显示
       id cacheData = [cache objectForKey:cacheKey];
        if(cacheData!=nil)
        {
            //将数据统一处理
            [self returnDataWithRequestData:cacheData];
        }
        return;
    }
    
    
    AFHTTPSessionManager *session=[AFHTTPSessionManager manager];
    session.responseSerializer.acceptableContentTypes=[NSSet setWithObjects:@"application/json",@"text/json",@"text/javascript",@"text/html", nil];
    //超时时间
    session.requestSerializer.timeoutInterval=10;
    session.responseSerializer=[AFHTTPResponseSerializer serializer];
    //Get请求
    if (requestType==RequestTypeGet)
    {
        [session GET:url parameters:params progress:^(NSProgress * _Nonnull downloadProgress) {
            
        } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            
            [weakSelf dealWithResponseObject:responseObject cacheUrl:allUrl cacheData:cacheData isCache:isCache cache:cache cacheKey:cacheKey];
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            [weakSelf showError:@"请检查网络设置"];
        }];
    }
    else if (requestType==RequestTypePost)
    {
        [session POST:url parameters:params progress:^(NSProgress * _Nonnull downloadProgress) {
            
        } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            
            [weakSelf dealWithResponseObject:responseObject cacheUrl:allUrl cacheData:cacheData isCache:isCache cache:cache cacheKey:cacheKey];
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            [weakSelf showError:@"请检查网络设置"];
        }];

    }
    else if (requestType==RequestTypeUpLoad)
    {
        [session POST:url parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
            NSTimeInterval timeInterVal = [[NSDate date] timeIntervalSince1970];
            NSString * fileName = [NSString stringWithFormat:@"%@.png",@(timeInterVal)];
            [formData appendPartWithFileData:data name:name fileName:fileName mimeType:@"image/png"];
            
        } progress:^(NSProgress * _Nonnull uploadProgress) {
           //(float)uploadProgress.completedUnitCount/(float)uploadProgress.totalUnitCount
        } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            
            [weakSelf dealWithResponseObject:responseObject cacheUrl:allUrl cacheData:cacheData isCache:isCache cache:nil cacheKey:nil];
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            [weakSelf showError:@"上传文件出错"];
        }];
     }
    else if (requestType==RequestTypeMultiUpload)
    {
        [session POST:url parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
            
            for (NSInteger i = 0; i < dataArray.count; i++)
            {
                NSData *imageData = [dataArray objectAtIndex:i];
                //name和服务端约定好
                [formData appendPartWithFileData:imageData name:@"file" fileName:[NSString stringWithFormat:@"%zi.jpg",i] mimeType:@"image/jpeg"];
            }
            
        } progress:^(NSProgress * _Nonnull uploadProgress) {
            //(float)uploadProgress.completedUnitCount/(float)uploadProgress.totalUnitCount
        } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            
            [weakSelf dealWithResponseObject:responseObject cacheUrl:allUrl cacheData:cacheData isCache:isCache cache:nil cacheKey:nil];
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            [weakSelf showError:@"上传文件出错"];
        }];
    }

}
#pragma mark  统一处理请求到的数据
-(void)dealWithResponseObject:(NSData *)responseData cacheUrl:(NSString *)cacheUrl cacheData:(id)cacheData isCache:(BOOL)isCache cache:(YYCache*)cache cacheKey:(NSString *)cacheKey  //cacheData暂不理会
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;// 关闭网络指示器
    });
    
    
    NSString * dataString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    dataString = [self deleteSpecialCodeWithStr:dataString];
    DYLog(@"response\\n%@\\n",dataString);
    NSData *requestData = [dataString dataUsingEncoding:NSUTF8StringEncoding];
    
    if (isCache) {
        //需要缓存,就进行缓存
        [cache setObject:requestData forKey:cacheKey];
        
    }
    /*
    //如果不缓存 或 数据不相同,就把网络返回的数据显示
    if (!isCache || ![cacheData isEqual:requestData]) {
        
        [self returnDataWithRequestData:requestData];
    }
     */
    //不管缓不缓存都要显示数据
    [self returnDataWithRequestData:requestData];
}

#pragma mark - 根据返回的数据进行统一的格式处理-requestData 网络或者是缓存的数据-
- (void)returnDataWithRequestData:(NSData *)requestData
{
    id myResult = [NSJSONSerialization JSONObjectWithData:requestData options:NSJSONReadingMutableContainers error:nil];
    
    
    //判断是否为字典
    if ([myResult isKindOfClass:[NSDictionary  class]]) {
        NSDictionary *  response = (NSDictionary *)myResult;
        
//        //根据返回的接口内容来变
        id success = [response objectForKey:@"success"];
        NSString* message = [response objectForKey:@"message"];
        //success存在,并且为0时
        if(success && ![success boolValue])//处理掉0的情况,直接进报错处理
        {
            if([message isKindOfClass:[NSString class]] && message.length>0)
            {
                //message不为空
            } else
            {
                message = @"";
            }
            
            [self showError:message];
            
            return;
        }
        
        NSLog(@"返回Json\\n%@\\n",response);
        //把data层剥掉
        NSDictionary *dict=[response objectForKey:@"data"];
        
        [self showSuccess:dict];
    }

}
#pragma mark - 拼接请求的网络地址
/**
 *  拼接请求的网络地址
 *
 *  @param urlStr     基础网址
 *  @param parameters 拼接参数
 *
 *  @return 拼接完成的网址
 */
-(NSString *)urlDictToStringWithUrlStr:(NSString *)urlString WithDict:(NSDictionary *)parameters
{
    if (!parameters) {
        return urlString;
    }
    
    
    NSMutableArray *parts = [NSMutableArray array];
    //enumerateKeysAndObjectsUsingBlock会遍历dictionary并把里面所有的key和value一组一组的展示给你，每组都会执行这个block 这其实就是传递一个block到另一个方法，在这个例子里它会带着特定参数被反复调用，直到找到一个ENOUGH的key，然后就会通过重新赋值那个BOOL *stop来停止运行，停止遍历同时停止调用block
    [parameters enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
        //字符串处理
        key=[NSString stringWithFormat:@"%@",key];
        obj=[NSString stringWithFormat:@"%@",obj];
        
        //接收key
        NSString *finalKey = [key stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
        //接收值
        NSString *finalValue = [obj stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
        
        
        NSString *part =[NSString stringWithFormat:@"%@=%@",finalKey,finalValue];
        
        [parts addObject:part];
        
    }];
    
    NSString *queryString = [parts componentsJoinedByString:@"&"];
    
    queryString = queryString.length!=0 ? [NSString stringWithFormat:@"?%@",queryString] : @"";
    
    NSString *pathStr = [NSString stringWithFormat:@"%@%@",urlString,queryString];
    
    return pathStr;
    
}
#pragma mark -- 处理json格式的字符串中的换行符、回车符
- (NSString *)deleteSpecialCodeWithStr:(NSString *)str {
    NSString *string = [str stringByReplacingOccurrencesOfString:@"\\r" withString:@""];
    string = [string stringByReplacingOccurrencesOfString:@"\\n" withString:@""];
    string = [string stringByReplacingOccurrencesOfString:@"\\n" withString:@""];
    string = [string stringByReplacingOccurrencesOfString:@"\\t" withString:@""];
    string = [string stringByReplacingOccurrencesOfString:@" " withString:@""];
    string = [string stringByReplacingOccurrencesOfString:@"(" withString:@""];
    string = [string stringByReplacingOccurrencesOfString:@")" withString:@""];
    return string;
}

#pragma mark  网络判断
-(BOOL)requestBeforeJudgeConnect
{
    struct sockaddr zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sa_len = sizeof(zeroAddress);
    zeroAddress.sa_family = AF_INET;
    SCNetworkReachabilityRef defaultRouteReachability =
    SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
    BOOL didRetrieveFlags =
    SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
    if (!didRetrieveFlags) {
        printf("Error. Count not recover network reachability flags\\n");
        return NO;
    }
    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
    BOOL isNetworkEnable  =(isReachable && !needsConnection) ? YES : NO;
    dispatch_async(dispatch_get_main_queue(), ^{
        [UIApplication sharedApplication].networkActivityIndicatorVisible =isNetworkEnable;/*  网络指示器的状态： 有网络 ： 开  没有网络： 关  */
    });
    return isNetworkEnable;
}

#pragma mark - 返回数据的调度显示
-(void)showSuccess:(id)response
{
    if(!self.requestDelegate) return;
    
    #pragma clang diagnostic push
    #pragma clang diagnostic ignored"-Wundeclared-selector"
    
    if ([self.requestDelegate respondsToSelector:@selector(httpSuccess:tag:)])
    {
        [self.requestDelegate performSelector:@selector(httpSuccess:tag:) withObject:response withObject:self.bindTag];
        return;
    }
    
    #pragma clang diagnostic pop
}

-(void)showError:(NSString *)error
{
    if(!self.requestDelegate) return;
    #pragma clang diagnostic push
    #pragma clang diagnostic ignored"-Wundeclared-selector"
    
    if ([self.requestDelegate respondsToSelector:@selector(httpError:tag:)])
    {
        [self.requestDelegate performSelector:@selector(httpError:tag:) withObject:error withObject:self.bindTag];
        return;
    }
    
    #pragma clang diagnostic pop
}
@end

上面代码着重注意下面的几行

    //设置YYCache属性
    YYCache *cache = [[YYCache alloc] initWithName:HttpCache];
    
    cache.memoryCache.shouldRemoveAllObjectsOnMemoryWarning = YES;
    cache.memoryCache.shouldRemoveAllObjectsWhenEnteringBackground = YES;
    
    id cacheData;
    /* 此处要修改为,服务端不要求重新拉取数据时执行;注意当缓存没取到时,重新访问接口
    if (isCache) {
        
        //根据网址从Cache中取数据
        cacheData = [cache objectForKey:cacheKey];
        if(cacheData!=nil)
        {
            //将数据统一处理
            [self returnDataWithRequestData:cacheData];
        }
    }
    */
    //进行网络检查
    if (![self requestBeforeJudgeConnect])
    {
        //断网
//        [self showError:@"请检查网络连接"];
       DYLog(@"\\n\\n----%@------\\n\\n",@"没有网络");
        //断网后,根据网址从Cache中取数据进行显示
       id cacheData = [cache objectForKey:cacheKey];
        if(cacheData!=nil)
        {
            //将数据统一处理
            [self returnDataWithRequestData:cacheData];
        }
        return;
    }

作用在于我们在拿到服务器数据之后,我们是不是把数据缓存到本地(需要服务器配合),但是在断网的情况下,我们是直接取缓存中的数据进行使用的...

存放网络数据到缓存的代码是

    NSString * dataString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    dataString = [self deleteSpecialCodeWithStr:dataString];
    DYLog(@"response\\n%@\\n",dataString);
    NSData *requestData = [dataString dataUsingEncoding:NSUTF8StringEncoding];
    
    if (isCache) {
        //需要缓存,就进行缓存
        [cache setObject:requestData forKey:cacheKey];
        
    }

上面只是部分代码实现....详细的,请看我gitHub上的demo 希望大家多多指教
链接地址为
https://github.com/BrightMoment/D-Y/tree/master/HttpWithCacheDemo

最后编辑于：2017.12.03 05:43:06

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