如何在Swift中打印变量的类型或类？

Question

如何在Swift中打印变量的类型或类？有没有办法在swift中打印变量的运行时类型？例如：var now = NSDate()var soon = now.dateByAddingTimeInterval(5.0)println("\(now.dynamicType)") // Prints "(Metatype)"println("\(now.dynamicType.description()")// Prints "__NSDate" since objective-c Class objects have a "description" selectorprintln("\(soon.dynamicType.description()")// Compile-time error since ImplicitlyUnwrappedOptional<NSDate> has no "description" method在上面的例子中，我正在寻找一种方法来显示变量“很快”是类型ImplicitlyUnwrappedOptional<NSDate>，或至少NSDate!。

Answer 1

这是你在找什么？

println("\(object_getClassName(now))");

它打印“__NSDate”

更新：请注意，这似乎不再适用于Beta05