October 2017
Intermediate to advanced
210 pages
5h 32m
English
Content preview from Swift 4 Protocol-Oriented Programming - Third Edition
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Understanding the problem
The problem the singleton pattern is designed to address is when we need one, and only one, instance of a type for the lifetime of our application. The singleton pattern is usually used when we need centralized management of an internal or external resource, and a single global point of access. Another popular use of the singleton pattern is when we want to consolidate a set of related activities, needed throughout our application, that does not maintain a state.
In Chapter 3, Extensions, we used the singleton pattern for our text validation types because we wanted to create a single instance of the types that could then be used by all the components of the application without requiring us to create new instances ...
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