Questions about using NSLog in Swift

In Swift, the compiler must complain if you want to execute nslog in the following ways:

class Foo {}NSLog("%@",Foo())

Because Foo is a native Swift class that is not inherited from NSObject, and NSLog needs its description method, we must make Foo derive from NSObject, and then overload the description method:

class Foo:NSObject {    overridevar description: String {return"大熊猫侯佩"}}

NSLog also supports string interpolation, so you can not derive from NSObject, as long as you follow the Customdebugstringconvertible protocol:

class Tom:CustomDebugStringConvertible{    varString {return"勒布朗-詹姆斯"}}NSLog("\(Tom())")

Questions about using NSLog in Swift