利用bmob平台，使用云端逻辑在Xcode上实现用户注册、登录

思路：bmob上构建云端逻辑，xcode通过http请求来在不引入bmob SDK的情况下，远程操作bmob上构建的数据库，实现注册、登录。

xcode导入

AFNetWorking-----------------网络请求，AFNetworking请求回的数据默认为nsdictionary，无需进一步转换

MBProgressHUD--------------------异步加载时的菊花显示

1.bmob云端逻辑构建

　　首先bmob注册，创建应用，拿到secretKey

云端逻辑的调用链接是：

http://cloud.bmob.cn/secretKey/functionName

云端逻辑的编写使用的js，没基础的可学下JS的基础用法，这里提一下

a.js数组创建 new Array()、动态添加arr.push(element)

b.字典是一种特殊的数组，通过key访问value，字典创建var dic = {"key":"value"}

c.调用response.send(obj)来返回云端函数处理的结果到xcode，以进一步处理

举个粒子：

function example(request,response,modules)
{
    //客户端有参数上传，使用的post请求，request拿到相应参数
    var curname = request.body.name;
    var curPsd = request.body.password;

    //response将云端执行的结果返回SDK
    respose.send(obj)

    modules提供各种对象处理的模块，如oData数据库对象、oFunctions云端逻辑对象
    var db = modules.oData;
    db.find(
    {
        "table":"tableName"
    },functions(err,data)
    {
    });
}

具体的数据库操作，方法之间的调用，看bmob开发文档！

我这里创建了4个云端函数，多说无益，附上doLogin、registerUser的代码

function onRequest(request, response, modules) {
    var functions = modules.oFunctions;
    var nameArr = new Array();
    var str = "";
    functions.run({
        "name":"getAllUserName"
    },function(err,data){
        //data为二进制流,转换一下
        var jsonObj = JSON.parse(data);
        // response.send(jsonObj);
        for(var o in jsonObj){
            var tmpstr = jsonObj[o];
            if(tmpstr){
                //非空字符串
                nameArr.push(tmpstr);
            }
        }
        // response.send(nameArr);
        var curname = request.body.username;
    var curpassword = request.body.password;
    //设立boolean变量，0-false，1-true
    var flag = 1;
    //构建输出端口
    var finalArr = {"code":"","msg":""};
    for(var i in nameArr){
        var tmpStr = nameArr[i];
        // response.send(tmpStr);
        if(tmpStr == curname){
            flag = 0;
            finalArr["code"] = "100";
            finalArr["msg"] = "用户名已注册";
            // response.send("用户名已注册！");
            response.send(finalArr);
            break;
        }
    }
    if(flag){
        var db = modules.oData;
        finalArr["code"] = "200";
        if(curname && curpassword){
            db.insert({
            "table":"TestUser",
            "data":{"name":curname,"password":curpassword}
        },function(err,data){
            if(err){
                // response.send(err);
                finalArr["msg"] = err;
            }else{
                // response.send("注册成功");
                finalArr["msg"] = "注册成功";
            }
            response.send(finalArr);
        });
        }
    }
    });

                                                }

function onRequest(request, response, modules) {
    var functions = modules.oFunctions;
    var nameArr = new Array();
    functions.run({
        "name":"getAllUserName"
    },function(err,data){
        var jsonObj = JSON.parse(data);
        for(var o in jsonObj){
            var tmpstr = jsonObj[o];
            if(tmpstr){
                nameArr.push(tmpstr);
            }
        }
        // response.send(nameArr);
        var curname = request.body.username;
        var curpassword = request.body.password;
        var flag = 0;
        //构建responseObj
        var responseObj = {"code":"","msg":""};
        for(var o in nameArr){
            var tmpstr = nameArr[o];
            if(curname == tmpstr){
                flag = 1;
                break;
            }
        }
        if(flag == 0){
            // response.send("用户名未注册！"
            responseObj["code"] = "100";
            responseObj["msg"] = "用户名未注册！";
            response.send(responseObj);
        }else{
            var db = modules.oData;
            db.find({
                "table":"TestUser"
                //单条数据必须使用objectID查询
                // "name":curname
            },function(err,data){
                // response.send(data);
                //遍历data，拿到相应name的password
                var jsonObj = JSON.parse(data);
                var arr = jsonObj["results"];
                // var loginFlag = 0;

                for(var o in arr){
                    var theName = arr[o].name;
                    if(theName == curname){
                        var thePassword = arr[o].password;
                        if(thePassword == curpassword){
                            // response.send("登录成功！");
                            responseObj["code"] = "200";
                            responseObj["msg"] = "登录成功！";
                        }else{
                            // response.send("密码错误！");
                            responseObj["code"] = "201";
                            responseObj["msg"] = "密码错误！";
                        }
                        response.send(responseObj);
                        break;
                    }
                }
            });
        }
    })
                                                }

云端函数的调试有两种方式，一种直接浏览器上链接

另一种函数写完，直接测试（推荐），网页链接仅指向最近的一次正确提交，显示不了错误　

Xcode发起请求，并拿回处理结果

1.afnetworking封装（不在赘述）

//  AFNetWorkingHelper.m
//  DateCorner
//
//  Created by 小儿黑挖土 on 16/12/2.
//  Copyright  2016年 小儿黑挖土. All rights reserved.

#import "AFNetWorkingHelper.h"

static AFNetWorkingHelper *_instance = nil;

@interface AFNetWorkingHelper ()

@property (nonatomic,strong)AFHTTPSessionManager *manager;

@end
@implementation AFNetWorkingHelper

+(instancetype) defaultHelper{
    static dispatch_once_t token;
    dispatch_once(&token, ^{
        _instance = [[super allocWithZone:NULL] init];
        [_instance initialization];
    });
    return _instance;
}
//重写alloc，copy的调用方法，instanc只初始化一次，实现单例
+(id)allocWithZone:(struct _NSZone *)zone{
    return [AFNetWorkingHelper defaultHelper];
}
-(id)copyWithZone:(struct _NSZone *)zone{
    return [AFNetWorkingHelper defaultHelper];
}
#pragma mark HTTP
-(void)sendRequestWithURLString:(NSString *)urlString
                     parameters:(NSDictionary *)parameters
                         success:(void (^)(NSURLSessionDataTask *,id))success
                        failure:(void (^)(NSURLSessionDataTask *,NSError *))failure
                          cache:(BOOL)useCache{
//    _manager.responseSerializer = [AFHTTPResponseSerializer serializer];
//    _manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
    if(useCache){
        _manager.requestSerializer.cachePolicy = NSURLRequestReturnCacheDataElseLoad;
    }else{
        _manager.requestSerializer.cachePolicy = NSURLRequestUseProtocolCachePolicy;
    }
    if(parameters != nil){//post
        [_manager POST:urlString parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            @try{
                success(task,responseObject);
            }@catch(NSException *exception){
                NSLog(@"[%@] throws exception:%@",NSStringFromSelector(_cmd),exception);
            }
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            @try{
                failure(task,error);
            }@catch(NSException *exception){
                NSLog(@"[%@] throws exception:%@",NSStringFromSelector(_cmd),exception);
            }
        }];
    }else{//get
        [_manager GET:urlString parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            @try{
                success(task,responseObject);
            }@catch(NSException *exception){
                NSLog(@"[%@] throws exception:%@",NSStringFromSelector(_cmd),exception);
            }
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            @try{
                failure(task,error);
            }@catch(NSException *exception){
                NSLog(@"[%@] throws exception:%@",NSStringFromSelector(_cmd),exception);
            }
        }];
    }
}
-(void)sendRequestWithURLString:(NSString *)urlString
                     parameters:(NSDictionary *)parameters
                        success:(void (^)(NSURLSessionDataTask *,id))success
                        failure:(void (^)(NSURLSessionDataTask *,NSError *))failure{
    [self sendRequestWithURLString:urlString parameters:parameters success:success failure:failure cache:NO];
}
-(void)sendRequestWithURLString:(NSString *)urlString
                        success:(void (^)(NSURLSessionDataTask *,id))success
                        failure:(void (^)(NSURLSessionDataTask *,NSError *))failure
                          cache:(BOOL)useCache{
    [self sendRequestWithURLString:urlString parameters:nil success:success failure:failure cache:useCache];
}
-(void)sendRequestWithURLString:(NSString *)urlString
                        success:(void (^)(NSURLSessionDataTask *,id))success
                        failure:(void (^)(NSURLSessionDataTask *,NSError *))failure{
    [self sendRequestWithURLString:urlString parameters:nil success:success failure:failure cache:NO];
}
-(void)uploadWithURLString:(NSString *)urlString
                      data:(NSData *)data
                    success:(void (^)(NSURLResponse *,id))success
                   failure:(void (^)(NSURLResponse *,NSError *))failure{
    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    [request addValue:@"b21fbd9b0ce4879dc618f6f685c223e0" forHTTPHeaderField:@"X-Bmob-Application-Id"];
    [request addValue:@"8f397fe28f5e02d316d9af109b3fcdc9" forHTTPHeaderField:@"X-Bmob-REST-API-Key"];
    [request addValue:@"image/jpeg" forHTTPHeaderField:@"Content-Type"];

    [request setHTTPBody:data];
    [request setHTTPMethod:@"POST"];

    NSURLSessionDataTask *task = [_manager dataTaskWithRequest:request completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        @try{
            if(error != nil){
                /*error	NSError *	domain: @"com.alamofire.error.serialization.response" - code: 18446744073709550605	0x0000600000440a50*/
                failure(response,error);
            }else{
                success(response,responseObject);
            }
        }@catch(NSException *exception){
            NSLog(@"throw exception:%@",exception);
        }
    }];
    [task resume];
}
#pragma mark private
-(void)initialization{
    self.manager = [AFHTTPSessionManager manager];
}
@end

2.封装参数，post请求

-(void)uploadPara{
    NSString *username = _usernameField.text;
    NSString *password = _passwordField.text;
    NSDictionary *para = @{@"username":username,@"password":password};

    AFNetWorkingHelper *helper = [AFNetWorkingHelper defaultHelper];
    [helper sendRequestWithURLString:KURLTypeRegister parameters:para success:^(NSURLSessionDataTask *task, NSDictionary *jsonObj) {
        [self successWithTask:task response:jsonObj];
    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        [self failureWithTask:task error:error];
    }];

}

3.拿回结果，进行相应的逻辑处理

//登录状态
-(void)successWithTask:(NSURLSessionTask *)task response:(NSDictionary *)data{
    if(data){
        //hud显示在异步网络请求前，消失在数据回传之后
        [hud hideAnimated:YES];
        NSString *msg = data[@"msg"];
        NSInteger code = [data[@"code"] integerValue];
        [self tipsAniamtion:msg];
        if(code == 200){
            [self performSelector:@selector(doDismiss) withObject:nil afterDelay:3];
        }
    }
}

-(void)failureWithTask:(NSURLSessionTask *)task error:(NSError *)error{
//    NSLog(@"register with error:%@",error.localizedDescription);
//    [self tipsAniamtion:error.localizedDescription];
}

项目效果如下：

源项目地址：https://github.com/xuanyuelin/BmobRegister/tree/master

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