UISlider in xcode - objective-c

Question

I was wondering if anyone has any idea how to connect a text field with a slider. I want the slider to list numbers from 1-100 or 1-1000. I've looked places but there is no true answer to what I'm looking for. Your help would be greatly appreciated

Answer 1

ViewController.h
#interface ViewController : UIViewController {
IBOutlet UISlider *mySlider;
IBOutlet UITextField *myTextField;
}
#property (nonatomic, retain) IBOutlet UISlider *mySlider;
#property (nonatomic, retain) IBOutlet UITextField *myTextField;
- (IBAction) sliderValueChanged:(id)sender;
- (IBAction) changeButtonPressed:(id)sender;
ViewController.m
#import "ViewController.h"
#implementation TutorialProjectViewController
#synthesize mySlider, myTextField;
- (void)viewDidLoad {
[super viewDidLoad];
self.myTextField.delegate = self;
}
- (IBAction) sliderValueChanged:(UISlider *)sender {
myTextField.text = [NSString stringWithFormat:#" %.1f", [sender value]];
}
- (IBAction) changeButtonPressed:(id)sender {
NSString *textValue = [myTextField text];
float value = [textValue floatValue];
if (value < 0) value = 0;
if (value > 100) value = 100;
mySlider.value = value;
myTextField.text = [NSString stringWithFormat:#"%.1f", value];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[myTextField resignFirstResponder];
//[put your textfield name here resignFirstResponder];
return NO;
}
#end
Change Slider Value:

Answer 2

I'm assuming you want to update the text field's text as the slider is changed.
You don't connect the two. You need to listen for changes to the slider's value. In the method that you setup for this, you need to convert the slider's value to the text you want. You then update the text field's text with this new text based on the slider's value.
The hook for the slider:
[someSlider addTarget:self action:#selector(sliderUpdate:) forControlEvents:UIControlEventValueChanged];
The method that listens to the slider:
- (void)sliderUpdate:(UISlider *)slider {
float newVal = slider.value;
NSString *newText = [NSString stringWithFormat:#"%d", (int)newVal];
someTextField.text = newText;
}
This code assumes the slider is referenced in the someSlider ivar and the text field is referenced by the someTextField ivar. It also assumes the slider's minimumValue is 0 and the maximumValue is 100 or 1000 as needed.

Answer 3

#import "FirstViewController.h"
#interface FirstViewController ()
#property (weak, nonatomic) IBOutlet UITextField *myTextBox;
#property (weak, nonatomic) IBOutlet UISlider *mySlider;
#property (weak, nonatomic) IBOutlet UINavigationBar *titleOnTop;
#property (weak, nonatomic) IBOutlet UIBarButtonItem *backButton;
- (IBAction)changeGreeting:(id)sender;
- (IBAction)sliderValueChanged:(id)sender;
- (IBAction)changeButtonPressed:(id)sender;
#end
#implementation FirstViewController
#synthesize mySlider, myTextBox;
- (void)viewDidLoad
{
[super viewDidLoad];
self.myTextBox.delegate = self;
}
- (IBAction) sliderValueChanged:(UISlider *)sender
{
myTextBox.text = [NSString stringWithFormat:#"%.1f", [sender value]];
}
- (void)sliderUpdate:(UISlider *)slider {
float newVal = slider.value;
NSString *newText = [NSString stringWithFormat:#"%d", (int)newVal];
myTextBox.text = newText;
}
- (IBAction) changeButtonPressed:(id)sender
{
NSString *textValue = [myTextBox text];
float value = [textValue floatValue];
if (value < 0) value = 0;
if (value > 1000) value = 1000;
mySlider.value = value;
myTextBox.text = [NSString stringWithFormat:#"%.1f", value];
if ([myTextBox canResignFirstResponder]) [myTextBox resignFirstResponder];
}
- (void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *) event
{
if (myTextBox)
{
if ([myTextBox canResignFirstResponder]) [myTextBox resignFirstResponder];
}
[super touchesBegan: touches withEvent: event];
}
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)viewDidUnload
{
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (IBAction)changeGreeting:(id)sender {
self.username = self.myTextBox.text;
NSString *nameString = self.username;
if ([nameString length] == 0) {
nameString = #"World";
}
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[myTextBox resignFirstResponder];
return YES;
}
#end

Answer 4

#import "FirstViewController.h"
#interface FirstViewController ()
#property (weak, nonatomic) IBOutlet UITextField *myTextBox;
#property (weak, nonatomic) IBOutlet UISlider *mySlider;
#property (weak, nonatomic) IBOutlet UINavigationBar *titleOnTop;
#property (weak, nonatomic) IBOutlet UIBarButtonItem *backButton;
- (IBAction)changeGreeting:(id)sender;
- (IBAction)sliderValueChanged:(id)sender;
- (IBAction)changeButtonPressed:(id)sender;
- (IBAction)backgroundTouched:(id)sender;
- (IBAction)textFieldReturn:(id)sender;
#end
#implementation FirstViewController
#synthesize mySlider, myTextBox;
- (IBAction)backgroundTouched:(id)sender;
{
[myTextBox resignFirstResponder];
}
- (IBAction)textFieldReturn:(id)sender;
{
[sender resignFirstResponder];
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.myTextBox.delegate = self;
}
- (IBAction) sliderValueChanged:(UISlider *)sender
{
myTextBox.text = [NSString stringWithFormat:#"%.1f", [sender value]];
}
- (void)sliderUpdate:(UISlider *)slider {
float newVal = slider.value;
NSString *newText = [NSString stringWithFormat:#"%d", (int)newVal];
myTextBox.text = newText;
}
- (void)textFieldDidChange:(UITextField*)sender { slider.value = [sender.text floatValue]; }
- (IBAction) changeButtonPressed:(id)sender
{
NSString *textValue = [myTextBox text];
float value = [textValue floatValue];
if (value < 0) value = 0;
if (value > 1000) value = 1000;
mySlider.value = value;
myTextBox.text = [NSString stringWithFormat:#"%.1f", value];
if ([myTextBox canResignFirstResponder]) [myTextBox resignFirstResponder];
}
- (void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *) event
{
if (myTextBox)
{
if ([myTextBox canResignFirstResponder]) [myTextBox resignFirstResponder];
}
[super touchesBegan: touches withEvent: event];
}
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
[self.textField addTarget:self action:#selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)viewDidUnload
{
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (IBAction)changeGreeting:(id)sender {
self.username = self.myTextBox.text;
NSString *nameString = self.username;
if ([nameString length] == 0) {
nameString = #"World";
}
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[myTextBox resignFirstResponder];
return NO;
}
#end