IOS swift if let a = b 可以通过a改变b的值么？，请大神解释解释

Question

如图为啥，为啥显示是这不科学呢，我觉得应该显示科学才对，莫非label和myLabel是绑定在一起的？

Answer 1

The class in Swift is a reference type, which is actually a pointer. label and myLabel point to a memory address, so they change the same thing
It’s just that the pointer myLabel cannot change the address it points to
You can try myLabel == = label to determine whether the addresses are the same

Answer 2

label 和 myLabel 引用的是同一个对象，label.text = “xx” 和 myLabel.text = “yy” 都是设置那个对象的 text Properties.

Answer 3

In Swift, all transfers of value types are copies, and all transfers of reference types are addresses

Answer 4

Thank you to the three great people above.
struct and enum are value types (pass by copy value) class instance objects are reference types (pass pointer)