xcode - how to create a uml class diagram from code -

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i building calculator app , stuck on creating uml class diagram it. if have following class in project called calculatorbrain, how make uml class diagram out of code? appreciated.

#import "calculatorbrain.h"  @implementation calculatorbrain -(void)updatecurrentnumber:(double)number {     currentnumber = number; }  -(void)updatecurrentoperation:(int)op {     currentoperation = op; } -(double)performoperation:(int)operation {     if (currentoperation == 0) {         result = currentnumber;     }     else{         switch (currentoperation) {             case 1:                 result = result * currentnumber;                 break;             case 2:                 result = result / currentnumber;                 break;         }     }     currentnumber = 0;     if (operation == 0) result = 0;      currentoperation = operation;     return result;  }  -(double)otherfunctions:(int)number {     double facreturn = 0;      switch (number) {         case 1:             facreturn = pow(currentnumber, 2);             break;         case 2:             facreturn = 1/currentnumber;             break;     }      return facreturn; }  -(double)performtrigoperation:(int)angle {     double angleresult = currentnumber;      switch (angle) {         case 1:             if (degorrad == 0 || degorrad == 2) {                 angleresult = (angleresult / 180) * 3.14159265;                 angleresult = sin(angleresult);             }             else             {                 angleresult = sin(angleresult);             }             break;         case 2:             if (degorrad == 0 || degorrad == 2) {                 angleresult = (currentnumber/180)*3.14159265;                 angleresult = cos(angleresult);             }             else             {                 angleresult = cos(angleresult);             }             break;     }      return angleresult; }  -(void)updateunitofmeasurement:(int)unit {     degorrad = unit; }  -(double)returncurrentnumber {     return currentnumber; } -(double)returncurrentoperation {     return currentoperation; }  @end


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