1.结构体对象

 struct Resolution {
    var width = 0
    var height = 0
}
   
  var one = Resolution()
        
  print("one地址为: \(Unmanaged<AnyObject>.passUnretained(one as! AnyObject).toOpaque())")
        
  var two = one
        
  print("two地址为:\(Unmanaged<AnyObject>.passUnretained(two as! AnyObject).toOpaque())")

结果如下

one地址为: 0x000060800004e1f0
two地址为: 0x000060800004e1c0

结论

在swift 中结构体中的复制操作是结构体对象的copy 重新拷贝了一份新的结构体对象

2.类对象

class VideoMode {
    var resolution = Resolution()
    var interlaced = false
    var frameRate = 0.0
    var name: String?
}
 
var three = VideoMode()
  
print("three地址为: \(Unmanaged<AnyObject>.passUnretained(three as! AnyObject).toOpaque())")

 var four = three

print("four地址为:  \(Unmanaged<AnyObject>.passUnretained(four as! AnyObject).toOpaque())")

结果如下

three地址为: 0x000060000008dac0
four地址为: 0x000060000008dac0

结论

类对象的之间赋值操作,只是添加了一个引用,没有创建新的对象.

SuperD总结

1.结构体中的结构体对象之间赋值操作会产生一个新的对象
2.类对象中的类对象之间的复制操作不会产生新的对象,只是添加了一个指针指向