swift 赋值判断

.

var name:String? = "Wing"
var geting = "Hello!"
if let thisname = name{
    geting = "Hello,(name)"            //Hello,Wing
}
else
{
    geting = "Hello,无名氏"
}

哎！为什么if判断里是一个赋值？那能有判断吗？哦！原来是判断赋值能否成功，成功则进入if判断体里，flase则进入else。

如果将name = "Wing"改为name = nil则进入else