我如何將一個ViewController的值傳遞給另一個ViewController，它們是用戶輸入和'計算'

Question

我想執行'TotalLabel'計算，到另一個稱爲'AdultPayNowViewController'的ViewContoller。我還要執行的「x」值，這是一個的UITextField該用戶輸入量到「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 =@"";