Objective c 在视图控制器之间减去浮点值

这是ViewControllerOne：

- (IBAction)total {

float a = ([textfield1.text floatValue]);
float b = ([textfield2.text floatValue]);
float c = ([textfield3.text floatValue]);
float d = ([textfield4.text floatValue]);
float e = ([textfield5.text floatValue]);
float f = a+b+c+d+e+([textfield6.text floatValue]);

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

这是视图控制器两个：

float g = ([textfield1.text floatValue]);
float h = ([textfield2.text floatValue]);
float i = ([textfield3.text floatValue]);
float j = ([textfield4.text floatValue]);
float k = ([textfield5.text floatValue]);
float l = a+b+c+d+e+([textfield6.text floatValue]);
totalTwo.text = [[NSString alloc] initWithFormat:@"$%.2f", l];

---

在ViewControllerThree中，我想用ViewControllerTo的和减去ViewControllerOne的和，并在标签中显示答案

在

appDelegate

中存储sum

total.text

和

totalTwo.text

的值

在AppDelegate.h文件中

float totalOne, totalTwo;
@propery(nonatomic)float totalOne, totalTwo;

在AppDelgate.m文件中

@synthesize totalOne, totalTwo;

- (IBAction)total 
{
   //Create the instance of appDelegate as
   AppDelegate *app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
   float a = ([textfield1.text floatValue]);
   float b = ([textfield2.text floatValue]);
   float c = ([textfield3.text floatValue]);
   float d = ([textfield4.text floatValue]);
   float e = ([textfield5.text floatValue]);
   float f = a+b+c+d+e+([textfield6.text floatValue]);
   app.totalOne = f;
   total.text = [[NSString alloc] initWithFormat:@"$%.2f", f];
}

//Create the instance of appDelegate as
AppDelegate *app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
float g = ([textfield1.text floatValue]);
float h = ([textfield2.text floatValue]);
float i = ([textfield3.text floatValue]);
float j = ([textfield4.text floatValue]);
float k = ([textfield5.text floatValue]);
float l = a+b+c+d+e+([textfield6.text floatValue]);
app.totalTwo = l;
totalTwo.text = [[NSString alloc] initWithFormat:@"$%.2f", l];

-(IBAction)btnCalculate
{
    //Create the instance of appDelegate as
    AppDelegate *app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    totalthree = app.totalOne - app.totalTwo;
    lbl.text = [NSString StringWithFormat:@"$%.2f", totalThree];
}

---

如何将总和存储在AppDelegate中？作为floattotalone和floattotaltwo？谢谢，这有助于我完成。关于最后一个问题，我想要'totalthree=app.totalOne-app.totalTwo；'使用-（iAction）计算在“label3”上显示。单击按钮时如何显示此总和？我感谢你的帮助