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Swift is a good choice for Swift App Development, there are some disadvantages, too. For example, it's not compatible with Objective-C. Moreover, you need to learn Objective-C if you're developing a mobile app in Swift. Nevertheless, it is highly recommended for any new project. Using it will give you access to the platform you need to work on. This is why it's so popular.

https://www.easyfie.com/read-blog/941308