ios - 如果文本字段是 myTextField { 条件 }

Question

我们有办法在 Swift 中做到这一点吗？

var myTextfield: UITextfield

if textfield is myTextField {
   condition
}

我尝试过但失败了:

if UITextfield = myTextField
if textfield = myTextField
if UITextfield.type = myTextField

还尝试过“==”作为比较运算符。

Answer 1

来自Apple Documentation :

Swift also provides two identity operators (=== and !==), which you use to test whether two object references both refer to the same object instance.