我如何将一个ViewController的值传递给另一个ViewController，它们是用户输入和'计算'

Question

我想执行'TotalLabel'计算，到另一个称为'AdultPayNowViewController'的ViewContoller。我还要执行的“x”值，这是一个的UITextField该用户输入量到“AdultPayNowViewController”

//AdultTicketCalculator.h

@interface StudentTicketCalculatorViewController : UIViewController { 

    IBOutlet UITextField *Quantity; 
    IBOutlet UILabel *Pricelabel; 
    IBOutlet UILabel *TotalLabel; 
    IBOutlet UIButton *CheckoutButton; 

} 

-(IBAction)calculate; 
-(IBAction)clear; 

@end 

\\AdultTicketCalculator.m 

-(IBAction)calculate { 

    float x = ([Quantity.text floatValue]); 
    float c = x*15; 

    TotalLabel.text = [[NSString alloc] initWithFormat:@"$%.2f", c]; 

} 

-(IBAction)clear { 

    Quantity.text =@""; 
    Pricelabel.text =@"$15.00"; 
    TotalLabel.text =@"";