objective-c - Xcode の UISlider

Question

テキストフィールドをスライダーに接続する方法を誰かが知っているかどうか疑問に思っていました. スライダーに 1 ～ 100 または 1 ～ 1000 の数字をリストするようにします。私は場所を見てきましたが、私が探しているものに対する真の答えはありません. あなたの助けは大歓迎です

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

スライダー値の変更：

Answer 2

スライダーが変更されたときにテキストフィールドのテキストを更新したいとします。

2つを接続しません。スライダーの値の変更をリッスンする必要があります。このために設定した方法では、スライダーの値を目的のテキストに変換する必要があります。次に、スライダーの値に基づいて、テキストフィールドのテキストをこの新しいテキストで更新します。

スライダーのフック：

[someSlider addTarget:self action:@selector(sliderUpdate:) forControlEvents:UIControlEventValueChanged];

スライダーをリッスンするメソッド：

- (void)sliderUpdate:(UISlider *)slider {
    float newVal = slider.value;

    NSString *newText = [NSString stringWithFormat:@"%d", (int)newVal];

    someTextField.text = newText;
}

このコードは、スライダーがsomeSliderivarで参照され、テキストフィールドがsomeTextFieldivarによって参照されていることを前提としています。また、スライダーminimumValueは0であり、maximumValue必要に応じて100または1000であると想定しています。

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;
    - (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

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;


@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