Swift：将AnyObject与`is`语法进行比较-Swift:CompareAnyObjectwith`is`Syntax

4  

The expression sender is Xyz is returning a Bool depending on if sender is of type Xyz. It appears that there is a compiler bug whereby sender is Xyz is actually returning a Int1 that is not getting coerced internally to a Bool.

表达式sender是Xyz返回Bool,具体取决于sender是否为Xyz类型。似乎有一个编译器错误,即发送者是Xyz实际上正在返回一个没有被内部强制转换为Bool的Int1。

A workaround is:

解决方法是:

let bOnus= (sender is Xyz ? true : false)

2  

You can also change it to

您也可以将其更改为

if let senderOfTypeXYZ = sender as? Xyz {
    // senderOfTypeXYZ is available with the expected type here
 }

0  

Workarounds aren't required anymore with the Beta 3 release and you can combine the is operator with other logical operators.

Beta 3版本不再需要解决方法,您可以将is运算符与其他逻辑运算符组合使用。