Скачать или смотреть Property Observers

In this, the third in a series of looking at struct and class properties and methods, we are going to take a look at property observers. Property observers observe and respond to changes in a property's value. They are called every time a property's value is set, even if the new value is the same as the property's current value. ... willSet is called just before the value is stored. didSet is called immediately after the new value is stored.

Starter Projects:
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Other videos in this series:
Computed properties, Getters and Setters
   • Computed Properties in Swift  

Instance methods and Static properties
   • Instance and Static Methods (Revised)  

Stewart Lynch's YouTube Playlist on iOS Development
   • Swift and SwiftUI Fundamentals  

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https://www.createchsol.com

Stewart Lynch's GitHub
https://github.com/StewartLynch