CODEWITHSUNDEEP
objective-ciouibutton
iworld
iworld

Reputation: 345

How when Button pressed twice the color should change

I used with NSUserDefaults even though it is not coming what i requried means If i click one time on that button it should change the colour to “green” and if i press it again it should change the colour to balck....

Here my Code is.....

- (IBAction)subscribeButtonAction:(id)sender {

    if (count == 0) {
        [_subscribeButtonObj setBackgroundColor:[UIColor greenColor]];
        greenStr=[NSString stringWithFormat:@"green"];
        NSUserDefaults *greendefults=[NSUserDefaults standardUserDefaults];
        [greendefults setValue:greenStr forKey:@"greencolor"];
        [greendefults synchronize];


        ///

        count++;
    }else if(count == 1){
        [_subscribeButtonObj setBackgroundColor:[UIColor blueColor]];
        blackStr=[NSString stringWithFormat:@"black"];
        NSUserDefaults *blackDefaults=[NSUserDefaults standardUserDefaults];
        [blackDefaults setValue:blackStr forKey:@"blackcolor"];
        [blackDefaults synchronize];
        //count = 0;
    }

}

in ViewWillAppear i wrote the code like this.....

-(void)viewWillAppear:(BOOL)animated
{

    //count = 0;



    if ([[NSUserDefaults standardUserDefaults]
         stringForKey:@"greencolor"]) {

        NSLog(@"change the button to green color %@",[[NSUserDefaults standardUserDefaults]
                                                      stringForKey:@"greencolor"]);

    }
    else

    {

        NSLog(@"change the button to blackcolor ");
    }
}

Upvotes: 0

Views: 148

Answers (4)

BHASKAR
BHASKAR

Reputation: 1201

in its button action 

- (IBAction)didTapButton:(id)sender {
    UIButton *btn = (UIButton *)sender;
    if (btn.isSelected == NO)
    {
        btn.selected =YES;
        btn.backgroundColor = [UIColor greenColor];
    }
    else
    {
        btn.selected =NO;
        btn.backgroundColor = [UIColor blackColor];
    }
}

Upvotes: 0

Anurag Bhakuni
Anurag Bhakuni

Reputation: 2439

hope this will help you

if you make it through .xib file then make an action event like

- (IBAction)changeColor:(UIButton *)sender {

    if (sender.isSelected == NO)
    {
        sender.selected =YES;
        sender.backgroundColor = [UIColor greenColor];
    }
    else
    {
         sender.selected =NO;
        sender.backgroundColor = [UIColor blackColor];
    }


}

and if you making it programmtically

UIButton *btn  = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 25, 25)];

[btn addTarget:self action:@selector(changeColor:) forControlEvents:UIControlEventTouchUpInside];

and implement above method.

Upvotes: 0

Tech_Intelliswift
Tech_Intelliswift

Reputation: 516

In you header file write :-

@property (weak, nonatomic) IBOutlet UIButton *myBtn;

- (IBAction)onTapBtn:(id)sender;

In your .m file synthesize it :-

@synthesize myBtn;

then,

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    [myBtn setBackgroundColor:[UIColor grayColor]];
    count = 0;
}

- (IBAction)onTapBtn:(id)sender {

    if (count == 0) {
        [myBtn setBackgroundColor:[UIColor greenColor]];
        count++;
    }else if(count == 1){
        [myBtn setBackgroundColor:[UIColor blueColor]];
        count = 0;
    }
}

Thats it,

You can change the color whatever you want and on how many clicks you want, Hope it helps else you can ask me :)

Upvotes: 0

Kio Coan
Kio Coan

Reputation: 581

You can create a int property to check the state of the button and increment it.

So, here is how my viewController.h looks like:

#import <UIKit/UIKit.h>

enum clickedTimes{
    neverClicked,
    clickedOnce,
    clickedTwice
};

@interface ViewController : UIViewController

@property int cTimes;
@property (weak, nonatomic) IBOutlet UIButton *myButton;

- (IBAction)changeColour:(id)sender;

@end

I just create a enum to represent the states, and create the button outlet, also it's action.

My viewController.m:

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
//Init the _cTimes property
    _cTimes = neverClicked;
}

- (IBAction)changeColour:(id)sender {
    switch (_cTimes) {
        case neverClicked:
            _myButton.tintColor = [UIColor greenColor];
            _cTimes++;
            break;
        case clickedOnce:
            _myButton.tintColor = [UIColor blackColor];
            _cTimes++;
            break;
        default:
            break;
    }
}

Hope it helps. :)

Upvotes: 0

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