swift 属性空 setter 和 getter

Question

我是 Ios 开发的初学者，所以如果这听起来像是一个愚蠢的问题，请原谅我。我经常看到这样的属性声明：

var desiredAccuracy: CLLocationAccuracy { get set }

那么 { get set } 是什么意思？变量是空 getter 和 setter 吗？

Answer 1

这是在协议中声明属性要求的方式：

Property requirements are always declared as variable properties, prefixed with the var keyword. Gettable and settable properties are indicated by writing { get set } after their type declaration, and gettable properties are indicated by writing { get }.

Apple Swift documentation

Answer 2

您在协议

中声明变量将具有 setter 和 getter

protocol Abstract  {
  var desiredAccuracy: Int { get set }
}

//so here  you can implement the abstract with struct or class.
struct  Concrete : Abstract {
  var desiredAccuracy: Int
}

var concrete =  Concrete(desiredAccuracy: 10)
print(concrete.desiredAccuracy)   <--  this is getter 
concrete.desiredAccuracy = 20     <--  this is setter
print(concrete.desiredAccuracy)   <--  this is getter

swift 属性空 setter 和 getter

swift properties empty setters and getters

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