ios - Swift 中的惰性属性等同于 Objective C 中的惰性 Init getter

Question

Swift 中的 lazy 属性是否等同于在 Objective C 中使用延迟加载模式覆盖 getter？

Answer 1

来自文档:

A lazy stored property is a property whose initial value is not calculated until the first time it is used. You indicate a lazy stored property by writing the lazy attribute before its declaration.

所以，大多数情况下，是的。

You must always declare a lazy property as a variable (with the var keyword), because its initial value may not be retrieved until after instance initialization completes. Constant properties must always have a value before initialization completes, and therefore cannot be declared as lazy.”

请记住，在 Swift 上，您可以选择为您的属性声明自定义 getter 和 setter:

var name : String?{
  get{
    return "Oscar"
  }
  set(newValue){

  }
}