swift protocol

importCocoa

@objcprotocolSortProtocol:NSObjectProtocol{

funcsame(value:Int)->Bool;

//@optional func beginSame()->Bool;//可选协议，但是没有编译过，原因未知

}

classca:NSObject,SortProtocol{

varage=0;

init(age:Int){

self.age= age;

}

Bool{

returnage== value;

}

}

varv1 =ca(age:2);

varv2 =v1.same(varv3 =0);