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NSError 中文提示

使用AFNetworking 网络请求失败，返回NSError对象，通常去error.localizedDescription提示在界面上，但是error.localizedDescription是英文提示，用户体验不好，本文通过AFN错误的code码，进行中文处理.

给NSError Categary一下，扩展个方法

#import <Foundation/Foundation.h>

@interface NSError (YJPError)
+ (NSError *)returnErrorWithError:(NSError *)error;
@end

#import "NSError+YJPError.h"

@implementation NSError (YJPError)
+ (NSError *)returnErrorWithError:(NSError *)error
{
    NSString *errorMesg;
    switch (error.code) {
        case -1://NSURLErrorUnknown
            errorMesg = @"未知错误";
            break;
        case -999://NSURLErrorCancelled
            errorMesg = @"无效的URL地址";
            break;
        case -1000://NSURLErrorBadURL
            errorMesg = @"无效的URL地址";
            break;
        case -1001://NSURLErrorTimedOut
            errorMesg = @"网络不给力，请稍后再试";
            break;
        case -1002://NSURLErrorUnsupportedURL
            errorMesg = @"不支持的URL地址";
            break;
        case -1003://NSURLErrorCannotFindHost
            errorMesg = @"找不到服务器";
            break;
        case -1004://NSURLErrorCannotConnectToHost
            errorMesg = @"连接不上服务器";
            break;
        case -1103://NSURLErrorDataLengthExceedsMaximum
            errorMesg = @"请求数据长度超出最大限度";
            break;
        case -1005://NSURLErrorNetworkConnectionLost
            errorMesg = @"网络连接异常";
            break;
        case -1006://NSURLErrorDNSLookupFailed
            errorMesg = @"DNS查询失败";
            break;
        case -1007://NSURLErrorHTTPTooManyRedirects
            errorMesg = @"HTTP请求重定向";
            break;
        case -1008://NSURLErrorResourceUnavailable
            errorMesg = @"资源不可用";
            break;
        case -1009://NSURLErrorNotConnectedToInternet
            errorMesg = @"无网络连接";
            break;
        case -1010://NSURLErrorRedirectToNonExistentLocation
            errorMesg = @"重定向到不存在的位置";
            break;
        case -1011://NSURLErrorBadServerResponse
            errorMesg = @"服务器响应异常";
            break;
        case -1012://NSURLErrorUserCancelledAuthentication
            errorMesg = @"用户取消授权";
            break;
        case -1013://NSURLErrorUserAuthenticationRequired
            errorMesg = @"需要用户授权";
            break;
        case -1014://NSURLErrorZeroByteResource
            errorMesg = @"零字节资源";
            break;
        case -1015://NSURLErrorCannotDecodeRawData
            errorMesg = @"无法解码原始数据";
            break;
        case -1016://NSURLErrorCannotDecodeContentData
            errorMesg = @"无法解码内容数据";
            break;
        case -1017://NSURLErrorCannotParseResponse
            errorMesg = @"无法解析响应";
            break;
        case -1018://NSURLErrorInternationalRoamingOff
            errorMesg = @"国际漫游关闭";
            break;
        case -1019://NSURLErrorCallIsActive
            errorMesg = @"被叫激活";
            break;
        case -1020://NSURLErrorDataNotAllowed
            errorMesg = @"数据不被允许";
            break;
        case -1021://NSURLErrorRequestBodyStreamExhausted
            errorMesg = @"请求体";
            break;
        case -1100://NSURLErrorFileDoesNotExist
            errorMesg = @"文件不存在";
            break;
        case -1101://NSURLErrorFileIsDirectory
            errorMesg = @"文件是个目录";
            break;
        case -1102://NSURLErrorNoPermissionsToReadFile
            errorMesg = @"无读取文件权限";
            break;
        case -1200://NSURLErrorSecureConnectionFailed
            errorMesg = @"安全连接失败";
            break;
        case -1201://NSURLErrorServerCertificateHasBadDate
            errorMesg = @"服务器证书失效";
            break;
        case -1202://NSURLErrorServerCertificateUntrusted
            errorMesg = @"不被信任的服务器证书";
            break;
        case -1203://NSURLErrorServerCertificateHasUnknownRoot
            errorMesg = @"未知Root的服务器证书";
            break;
        case -1204://NSURLErrorServerCertificateNotYetValid
            errorMesg = @"服务器证书未生效";
            break;
        case -1205://NSURLErrorClientCertificateRejected
            errorMesg = @"客户端证书被拒";
            break;
        case -1206://NSURLErrorClientCertificateRequired
            errorMesg = @"需要客户端证书";
            break;
        case -2000://NSURLErrorCannotLoadFromNetwork
            errorMesg = @"无法从网络获取";
            break;
        case -3000://NSURLErrorCannotCreateFile
            errorMesg = @"无法创建文件";
            break;
        case -3001:// NSURLErrorCannotOpenFile
            errorMesg = @"无法打开文件";
            break;
        case -3002://NSURLErrorCannotCloseFile
            errorMesg = @"无法关闭文件";
            break;
        case -3003://NSURLErrorCannotWriteToFile
            errorMesg = @"无法写入文件";
            break;
        case -3004://NSURLErrorCannotRemoveFile
            errorMesg = @"无法删除文件";
            break;
        case -3005://NSURLErrorCannotMoveFile
            errorMesg = @"无法移动文件";
            break;
        case -3006://NSURLErrorDownloadDecodingFailedMidStream
            errorMesg = @"下载解码数据失败";
            break;
        case -3007://NSURLErrorDownloadDecodingFailedToComplete
            errorMesg = @"下载解码数据失败";
            break;
    }
// 重点： 根据错误的code码，替换AFN传入的error 中NSLocalizedDescriptionKey键值对，重新组装返回
    NSMutableDictionary *errorInfo = [[NSMutableDictionary alloc]initWithDictionary:error.userInfo];
    [errorInfo setObject:errorMesg forKey:NSLocalizedDescriptionKey];
    NSError *newError = [[NSError alloc] initWithDomain:NSCocoaErrorDomain code:4 userInfo:errorInfo];
    return newError;
}

使用

导入NSError+ YJPError， 在你的网络工具请求失败处使用,剩下的想象交给你了.

    [manager GET:urlString parameters:parameters success:^(NSURLSessionDataTask *task, id responseObject) {
    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        NSError *newError = [NSError returnErrorWithError:error];
//  失败的请求地址
        NSLog(@"%@",newError.userInfo[@"NSErrorFailingURLKey"]);
// 中文提示语
        NSLog(@"%@",newError.localizedDescription);
    }];