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Alamofire 5 Tutorial for iOS: Getting Started
https://www.raywenderlich.com/6587213-alamofire-5-tutorial-for-ios-getting-started
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the swift programming language
https://docs.swift.org/swift-book/LanguageGuide/CollectionTypes.html
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Youtube video Downloader
https://en.savefrom.net/1-youtube-video-downloader-20/
https://www.toutiao.com/a6875492307282428428/?channel=&source=search_tab
https://www.zyaupair.com/usAppleID/12.html
- swift-programming
https://www.programiz.com/swift-programming/hello-world
- runtime objective-c
- https://programmer.group/runtime-summary.html
细说OC中的KVO
https://blog.csdn.net/wangjunling888/article/details/82422463