Buzzler

PROJECTS | 2018 | Links: Github

대학생을 위한 블록체인 기반의 SNS 어플리케이션

NOTE: Side Project with 5 team members

1. Description

• 진행기간: 2018.04 ~ 2018.10
• 프로젝트 내용: 대학생을 위한 블록체인 기반의 SNS 어플리케이션
• 역할: iOS 앱 개발
• 사용한 Skill: Swift, MVVM, RxSwift

2. Code Snippet

• Github: https://github.com/tak-bro/Buzzler

//
//  LoginViewModel.swift
//  Buzzler
//
//  Created by 진형탁 on 2018. 4. 18..
//  Copyright © 2018년 Buzzler. All rights reserved.
//
import UIKit
...

private let disposeBag = DisposeBag()

public protocol LoginViewModelInputs {
    var email: PublishSubject<String?> { get}
    var password: PublishSubject<String?> { get }
    var loginTaps: PublishSubject<Void> { get }
}

public protocol LoginViewModelOutputs {
    var validatedEmail: Driver<ValidationResult> { get }
    var validatedPassword: Driver<ValidationResult> { get }
    var enableLogin: Driver<Bool>{ get }
    var signedIn: Driver<LoginResponse> { get }
    var isLoading: Driver<Bool> { get }
}

public protocol LoginViewModelType {
    var inputs: LoginViewModelInputs { get }
    var outputs: LoginViewModelOutputs { get }
}

class LoginViewModel: LoginViewModelType, LoginViewModelInputs, LoginViewModelOutputs {
    
    public var validatedEmail: Driver<ValidationResult>
    public var validatedPassword: Driver<ValidationResult>
    public var enableLogin: Driver<Bool>
    
    public var loginTaps: PublishSubject<Void>
    public var password: PublishSubject<String?>
    public var email: PublishSubject<String?>
    public var signedIn: Driver<LoginResponse>
    public var isLoading: Driver<Bool>
    
    public var inputs: LoginViewModelInputs { return self }
    public var outputs: LoginViewModelOutputs { return self }
    
    // Private
    fileprivate let provider: RxMoyaProvider<Buzzler>
    
    public init(provider: RxMoyaProvider<Buzzler>) {
        self.provider = provider
        
        self.email = PublishSubject<String?>()
        self.password = PublishSubject<String?>()
        self.loginTaps = PublishSubject<Void>()
        
        let validationService = BuzzlerDefaultValidationService.sharedValidationService
        
        self.validatedEmail = self.email
            .asDriver(onErrorJustReturn: nil)
            .flatMapLatest { email in
                return validationService.validateUserId(email!)
                    .asDriver(onErrorJustReturn: .failed(message: "Error contacting server"))
        }
        
        self.validatedPassword = self.password
            .asDriver(onErrorJustReturn: nil)
            .map{ password in
                return validationService.validateTextString(password!)
        }
        
        self.enableLogin = Driver
            .combineLatest(validatedEmail, validatedPassword) { email, password in
                return email.isValid && password.isValid
        }
        
        let emailAndPassword = Driver.combineLatest(self.email.asDriver(onErrorJustReturn: nil),
                                                    self.password.asDriver(onErrorJustReturn: nil)) { ($0,$1)  }
        
        let isLoading = ActivityIndicator()
        self.isLoading = isLoading.asDriver()
        
        self.signedIn = self.loginTaps
            .asDriver(onErrorJustReturn:())
            .withLatestFrom(emailAndPassword)
            .flatMapLatest{ tuple in
                return API.sharedAPI
                    .signIn(email: tuple.0!, password: tuple.1!)
                    .trackActivity(isLoading)
                    .asDriver(onErrorJustReturn: LoginResponse(error: ErrorResponse(code: 500, message: "Server Error!"), result: nil))
            }
            .flatMapLatest{ loginResult in
                return API.sharedAPI
                    .getUserInfo(loginResult: loginResult)
                    .trackActivity(isLoading)
                    .asDriver(onErrorJustReturn: LoginResponse(error: ErrorResponse(code: 500, message: "Server Error!"), result: nil))
        }
    }
}

3. Demo

4. Images

• Landing Page

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