简单封装 AFNetworking并添加缓存

简单封装 AFNetworking 并添加缓存

初始化缓存 10M内存 1G硬盘

static NSURLCache* sharedCache = nil;
+(NSURLCache*)sharedCache
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        NSString *diskPath = [NSString stringWithFormat:@"RequestCenter"];
        sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:1024*1024*10
                                                    diskCapacity:1024*1024*1024
                                                        diskPath:diskPath];
    });
    return sharedCache;
}

定义一个继承NSObject的工具类，目的是方便以后换底层的网络库

+(void)getCacheWithUrl:(NSString *)url option:(BcRequestCenterCachePolicy)option parameters:(NSDictionary *)parameters success:(BaseHttpToolSucess)success failur:(BaseHttpToolFailur)failur

下面是实现的代码,我这里采用如果第一次进入没有缓存，那么直接读取服务器，如果本地有了，再存下来，每次读的都是上一次的数据，根据判断URL实现

拿到request

NSString *url = nil;
NSError *serializationError = nil;
NSString *URLString = [[NSURL URLWithString:url relativeToURL:nil] absoluteString];
NSMutableURLRequest *request = [mgr.requestSerializer requestWithMethod:@"GET"
                                                              URLString:URLString 
                                                             parameters:parameters 
                                                                  error:&serializationError];

拿到cachedResponse，转换成JSON

NSCachedURLResponse *cachedResponse = [[self sharedCache] cachedResponseForRequest:request];
if (cachedResponse) {
    id json = [NSJSONSerialization JSONObjectWithData:cachedResponse.data
                                              options:NSJSONReadingMutableLeaves
                                                error:nil];
    NSLog(@"缓存后的数据  %@",json);
}

当网络请求成功以后，判断一下之前是否存在这个URL

if (![operation.response.URL isEqual:cachedResponse.response.URL]) {
    if (sucess) {
        sucess(responseObject);
        NSLog(@"第一次进入系统没有缓存%@",responseObject);
    }
}   

然后再保存下来

NSData *data = [NSJSONSerialization dataWithJSONObject:responseObject options:NSJSONWritingPrettyPrinted error:nil];
cachedResponse = [[NSCachedURLResponse alloc] initWithResponse:operation.response
                                                          data:data
                                                      userInfo:nil 
                                                 storagePolicy:NSURLCacheStorageAllowed];
[[self sharedCache] storeCachedResponse:cachedResponse forRequest:request];

Demo: https://github.com/BaiCanLin/GETPOST