willSet/didSet vs. get/set
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Swift ⟩ type ⟩ property ⟩ willSet/didSet vs. get/set
willSet/didSet (property observer) vs. get/set (computed property)
需主動調整或限制屬性值時，用 get/set。
只需監控屬性變化或執行副作用，用 willSet/didSet。
computed property 本質上不直接儲存值，不支援 willSet/didSet。
willSet/didSet 只能用於 stored property。