From the course: Practical Design Patterns in Swift
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Purpose, pros, and cons - Swift Tutorial
From the course: Practical Design Patterns in Swift
Purpose, pros, and cons
- [Instructor] The first patten we're goona talk about is the singleton. It's one of the simplest design patterns, but it's probably also the most misused one. The singleton's primary purpose is to guarantee that we can create only one instance of a given type. When would you need this behavior? Singletons can serve you well if there's a single resource, and you need to access and manage that single instance throughout your application. The UIApplication object is a good example. We need one in every IOS app, but we shouldn't have more than one. The singleton UIApplication instance can be accessed using the shared type property. Another example would be a log file handler. You want to ensure that all the logs emitted by the various components of your software system, get inserted into the log file. Also, you need to avoid synchronization issues and data corruption. A singleton can satisfy all these requirements. Having more than one instance of the log file handler is not only…
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