Objective C eqivalent Swift code? -

this class method , passing block 1 of argument how pass blocks in swift?

+ (nsurlsessiondatatask *)getallsongifo:(nsdictionary *)userinfo withblock:(void (^)(nsarray *songinfos, nserror *error))block; 

swift equivalent:

func getallsongifo(userinfo: nsdictionary, withblock block:((nsarray?, nserror?) -> void)) -> nsurlsessiondatatask 

if want class method need add class keyword like:

class func getallsongifo(userinfo: nsdictionary, withblock block:((nsarray?, nserror?) -> void)) -> nsurlsessiondatatask