CODEWITHSUNDEEP
ios
Liondancer
Liondancer

Reputation: 16469

segmented control activation on tap

I have this segmented control and I want it to activate something when one of the segments is tapped. My app already does some computation so I want the segmented control to activate only upon being tapped. I created an if statement to activate it but I'm not sure what to put for the conditions. Not sure if I am going about this app properly but Im just testing things here and there.

if (/** on tap **/){

NSArray *tipValues = @[@(0.1), @(0.15), @(0.2)];
tipAmount = billAmount * [tipValues[self.tipControl.selectedSegmentIndex] floatValue];
totalAmount = tipAmount + billAmount;
}

Here is the code for part of my project:

#import "TipViewController.h"
#import "SettingsViewController.h"

@interface TipViewController ()

@property (weak, nonatomic) IBOutlet UITextField *billTextField;
@property (weak, nonatomic) IBOutlet UILabel *tipLabel;
@property (weak, nonatomic) IBOutlet UILabel *totalLabel;
@property (weak, nonatomic) IBOutlet UISegmentedControl *tipControl;

- (IBAction)onTap:(id)sender;
- (void)updateValues;
- (void)onSettingsButton;

@end

@implementation TipViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.title = @"Tip Calculator";
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self updateValues];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Settings" style:UIBarButtonItemStylePlain target:self action:@selector(onSettingsButton)];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)onTap:(id)sender {
    [self.view endEditing:YES]; //keyboard goes away
    [self updateValues];
}

- (void)updateValues{
    float billAmount = [self.billTextField.text floatValue];

    float tipAmount;
    float totalAmount;

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    //NSString *stringValue = [defaults objectForKey:@"some_key_that_you_choose"];
    int intValue = [defaults integerForKey:@"another_key_that_you_choose"];

    if (intValue && billAmount > 0) {
        tipAmount =  .01 * intValue * billAmount;
        totalAmount = tipAmount + billAmount;
    }

    // array to hold all tip values

    if (){

    NSArray *tipValues = @[@(0.1), @(0.15), @(0.2)];
    tipAmount = billAmount * [tipValues[self.tipControl.selectedSegmentIndex] floatValue];
    totalAmount = tipAmount + billAmount;
    }


    self.tipLabel.text = [NSString stringWithFormat:@"$%0.2f", tipAmount];
    self.totalLabel.text = [NSString stringWithFormat:@"$%0.2f", totalAmount];

}

- (void)onSettingsButton {
    [self.navigationController pushViewController:[[SettingsViewController alloc] init] animated:YES];
}

@end

Updated updateValues

- (void)updateValues{
    float billAmount = [self.billTextField.text floatValue];
    //tipAmountIndex = NSNotFound;

    float tipAmount;
    float totalAmount;

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    //NSString *stringValue = [defaults objectForKey:@"some_key_that_you_choose"];
    int intValue = [defaults integerForKey:@"another_key_that_you_choose"];

    //self.tipAmountIndex = NSNotFound
    // array to hold all tip values

    if (self.tipAmountIndex != NSNotFound) {
        NSArray *tipValues = @[@(0.1), @(0.15), @(0.2)];
        tipAmount = billAmount * [tipValues[self.tipControl.selectedSegmentIndex] floatValue];
        totalAmount = tipAmount + billAmount;
    }else {
        if (intValue && billAmount > 0) {
            tipAmount =  .01 * intValue * billAmount;
            totalAmount = tipAmount + billAmount;
            //[self.tipControl setSelectedSegmentIndex:-1 ];
            self.tipAmountIndex = NSNotFound;
        }
    }

    self.tipLabel.text = [NSString stringWithFormat:@"$%0.2f", tipAmount];
    self.totalLabel.text = [NSString stringWithFormat:@"$%0.2f", totalAmount];

}

Upvotes: 0

Views: 155

Answers (1)

Wain
Wain

Reputation: 119031

You need to add a target / action to the segmented control so that it tells you when the segment is changed and you can run your code. Assuming your code is in the method refreshForPercentageChange:

[self.segmentControl addTarget:self action:@selector(refreshForPercentageChange) forControlEvents:UIControlEventValueChanged];

Specifically for your updated code, you could have a variable tipAmountIndex. When the user enters a specific value, set it to NSNotFound. If the segment is tapped, set it to the index. Then in your code you would use:

if (self. tipAmountIndex != NSNotFound) {

but this if should be around determining the tap multiplier only. The else should add the default / user set tip multiplier. Then the calculation is after (not inside) the if.

Upvotes: 2

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