How to reload a tableView i.e call the viewDidLoad method if a condition is met - objective-c

Question

The problem is this i need a way to basically erase all the entry data a user placed into my arrays if a condition is met. Im new to Objective-C and iOS programming, but i believed the solution might be in calling the viewDidLoad method, thus it would virtually refresh the applications with the values of the array reset to default. If there is any other logical way of doing this i would appreciate the help.
In short i need to refresh the arrays as they were when the application first launched and the user did not select anything.
This is the part where i need it to refresh.
if ([gradeRecieved objectAtIndex:i]==nil) {
break; // if this condition is met the program must begin anew.
Edit* I need to recall the - (void)viewDidLoad method
here is more of the code.
-(IBAction)button:(id)sender{
double sum = 0;
int i = 0;
double gradeEarned=0;
double creditHours = 3;
while (i<8){
// [credits removeObjectIdenticalTo:[NSNull null]];
if ([credits count ] ==0) {
break;
}
if ([credits objectAtIndex:i] == radioButtonA) {
// [gradeRecieved replaceObjectAtIndex:i withObject:GradeA];
[defArray addObject:GradeA];
gradeEarned+=GradeA.intValue;
i++;
continue;
}
if ([credits objectAtIndex:i] == radioButtonB) {
// [gradeRecieved replaceObjectAtIndex:i withObject:GradeB];
[defArray addObject:GradeB];
gradeEarned+=GradeB.intValue;
i++;
continue;
}
if ([credits objectAtIndex:i]== radioButtonC){
// [gradeRecieved replaceObjectAtIndex:i withObject:GradeC];
[defArray addObject:GradeC];
gradeEarned+=GradeC.intValue;
i++;
continue;
}
if ([credits objectAtIndex: i] == defaulter) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Custom button pressed" message:[NSString stringWithFormat:#"You pressed the custom button C"] delegate:self cancelButtonTitle:#"great"otherButtonTitles:nil];
[alert show];
[alert release];
[self viewDidLoad];
break;
}
}
if ([defArray count]>0) {
sum= ([defArray count])/(creditHours*gradeEarned);
NSLog(#"%f",sum);}
this new code however results in the app freezing if the user clicks the button and then try's to redo some selections made

Answer 1

If you want to call that code again, wrap that code into a method and call that method in viewDidLoad and wherever else you want. Here is some example code:
- (void)viewDidLoad {
if ([gradeRecieved objectAtIndex:i]==nil) {
[self refreshArray];
}
}
- (void)refreshArray {
// refresh here
}
Then call [self refreshArray] wherever you need!
I see you are new! If this answer was correct you can up vote or tick!

Answer 2

The viewDidLoad method loads only once - when the view is first loaded. To reload data, the easiest way is to create another method and call that method everytime you need to load data.
Example,
-(void)loadingData{
//code to load the data
}
-(void)viewDidLoad{
//this will call the loadingData method to load the data
[self loadingData];
}