命令在 Swift 中的实现
Command is behavioral design pattern that converts requests or simple operations into objects.
The conversion allows deferred or remote execution of commands, storing command history, etc.
在 Swift 中使用模式
Usage examples: The Command pattern is pretty common in Swift code. Most often it's used as an alternative for callbacks to parameterizing UI elements with actions. It's also used for queueing tasks, tracking operations history, etc.
Identification: The Command pattern is recognizable by behavioral methods in an abstract/interface type (sender) which invokes a method in an implementation of a different abstract/interface type (receiver) which has been encapsulated by the command implementation during its creation. Command classes are usually limited to specific actions.