是否可以在同一条件语句中使用可选绑定中的变量？

Question

if let popupButton = result?.control as? NSPopUpButto {
    if popupButton.numberOfItems <= 1 {
        // blahblah
    }
}

I want to avoid the double nested if.

if let popupButton = result?.control as? NSPopUpButton && popupButton.numberOfItems <= 1 {}

but I get the unresolved identifier compiler error if I do that.

Is there any way to make this condition on one line? Or because I'm using an optional binding, am I forced to make a nested if here?

Answer 1

You can do it this way:

if let popupButton = result?.control as? NSPopUpButton, popupButton.numberOfItems <= 1 {
    //blahblah
}