Remove all controls (subviews) in UITabBarViewController - objective-c

Question

I'm fairly new to ios programming and I encountered an issue lately. I'm trying to navigate to a selected tab of a tabbarviewcontroller programmatically. Upon entering that selected tab, remove all controls in it and repopulate it with different controls.
I managed to navigate to that selected tab programmatically, however, i'm unable to remove all the subviews.
Below are snippet of my codes..
- (IBAction)btnSave:(id)sender {
orthoPaedicInjuryTabBarViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"OrthoInjuryTabBarVC"];
orthoPaedicInjuryTabBarViewController.selectedIndex = 2;
[self presentViewController:orthoPaedicInjuryTabBarViewController animated:YES completion:nil];
self.alert = [[UIAlertView alloc] initWithTitle:#"Empty Field, Step3"
message: #"Please fill up the frequency of exercises"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[self.alert show];
}
- (void)viewWillAppear:(BOOL)animated {
Store *MyStore = [Store SharedStore];
OrthoInjury *orthoInjury = MyStore.orthoInjury;
NSDateFormatter *format = [[NSDateFormatter alloc] init];
[format setDateFormat:#"dd-MM-yyyy"];
NSString *Dob = [format stringFromDate:orthoInjury.dateOfInjury];
self.lblDateOfInjury.text= Dob;
// Do any additional setup after loading the view, typically from a nib.
self.typeOfExercisesList = [Utility GetTypesOfExercisesList];
self.pickerViewTypesOfexercises.dataSource = self;
self.pickerViewTypesOfexercises.delegate = self;
TherapyPhases *therapyPhases = MyStore.therapyPhases;
self.tbxNumberOfWeeks.text = #(therapyPhases.durationWeeks).stringValue;
if([[orthoInjury.natureOfInjury uppercaseString] isEqualToString:[#"Repetitive Strain Injury" uppercaseString]])
{
NSArray *subArray = [self.view subviews];
if([subArray count] != 0) {
for(int i = 1 ; i < [subArray count] ; i++) {
[[subArray objectAtIndex:i] removeFromSuperview];
/*if ([[subArray objectAtIndex:i] isKindOfClass:[UILabel class]])
{
NSLog(#"%#",[[subArray objectAtIndex:i] text]);
}*/
}
}
}
}

Answer 1

Try below for removing the subviews:-
NSMutableArray *subVws=[self.tabBarController.view.subviews mutableCopy];
[subVws performSelector:#selector(removeFromSuperview)];