语言
    Objective-C
        https://www.runoob.com/w3cnote/objective-c-tutorial.html
    Swift
        Swift开发手册 https://github.com/KwaiAppTeam/SwiftPamphletApp
        【iOS开发入门】Swift语言入门  https://www.bilibili.com/video/BV1A54y1a7j3   
    内存管理
        栈和堆
            https://blog.csdn.net/u012836896/article/details/89973820
        值类型 vs 引用类型
            【iOS开发入门】10.Swift语言入门-类与结构体 https://www.bilibili.com/video/BV1V44y167no?spm_id_from=333.999.0.0
        循环引用
            https://zhuanlan.zhihu.com/p/22299084
框架
    UIKit
        UI控件的使用
            https://developer.apple.com/documentation/uikit/views_and_controls
            https://www.bilibili.com/video/BV1Fh411Y7K6
        UIViewController
            生命周期
            https://developer.apple.com/documentation/uikit/view_controllers
        App生命周期
            https://developer.apple.com/documentation/uikit/app_and_environment/managing_your_app_s_life_cycle
        动画
            https://github.com/qunten/iOS-Core-Animation-Advanced-Techniques
        手势识别
            https://www.jianshu.com/p/399fb18ad551
    Foundation
        通知 (NSNotification)
            https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Notifications/Introduction/introNotifications.html
        文件操作 (NSFileManager)
            https://developer.apple.com/documentation/foundation/filemanager
        多线程
            GCD(Grand Central Dispatch )
                https://www.jianshu.com/p/2d57c72016c6
            NSThread
                https://www.jianshu.com/p/686dbf4bbb52
            NSOperation
                https://www.jianshu.com/p/cffd3ace0653
            NSThread、GCD、NSOperation多线程编程总结
                https://blog.csdn.net/cordova/article/details/69060085
            主线程 和 其他线程的区别
                UI只能在主线程操作
    音视频 （AVFoundation）
        https://www.cnblogs.com/mtystar/p/6771621.html
网络编程
    JSON
        https://www.w3school.com.cn/js/js_json_intro.asp
    HTTP协议
        图解HTTP https://book.douban.com/subject/25863515/
    TCP/IP
        图解TCP/IP https://book.douban.com/subject/24737674/
    URLSession （系统提供的API）
        https://developer.apple.com/documentation/foundation/url_loading_system/fetching_website_data_into_memory
    Alamofire (网络库)
        https://github.com/Alamofire/Alamofire
架构
    MVC
        https://www.ruanyifeng.com/blog/2007/11/mvc.html
    MVVM
        https://www.cnblogs.com/jys509/p/13257669.html
    Redux（可选）
        https://github.com/ReSwift/ReSwift
        https://www.ruanyifeng.com/blog/2016/09/redux_tutorial_part_one_basic_usages.html
    Viper（可选）
        https://www.jianshu.com/p/340b39c6d256
持久化
    NSUserDefaults
        简单的KV存储
            https://www.jianshu.com/p/5948607b3f67
    数据库（可选）
        sqlite
            https://www.runoob.com/sqlite/sqlite-tutorial.html
        Realm
            https://github.com/realm/realm-swift
工具链
    版本管理工具
        git
            https://www.runoob.com/git/git-tutorial.html
    Cocoapods (包管理工具)
        https://www.bilibili.com/video/BV1Lf4y1G7nC
    终端的使用
        https://zhuanlan.zhihu.com/p/435856183
    证书&签名&真机调试
        https://developer.apple.com/cn/support/code-signing/
学习资源
    https://objccn.io/issues/
    https://nshipster.cn/
    https://developer.apple.com/videos/