CODEWITHSUNDEEP
iosobjective-ccocoa-touch
FrozenHeart
FrozenHeart

Reputation: 20736

How to place button and transfer its state between all view controllers

I have a "mute sounds" button that I need to place in all view controllers and its state should be transferred between it. How can I achieve this behavior? Is there smth like template for all view contollers or should I place it and transfer its state manually?

Thanks in advance.

Upvotes: 0

Views: 56

Answers (3)

iphonic
iphonic

Reputation: 12719

The best way is to create a Super Class which will handle the mute button behavior all together. See the implementation.

Create a Super Class of type UIViewController, say it BaseViewController. So it should look like below

BaseViewController.h

#import <UIKit/UIKit.h>

@interface BaseViewController : UIViewController

@end

BaseViewController.m

#import "BaseViewController.h"

@interface BaseViewController ()

@end

@implementation BaseViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [self prepareVolumeButton];

}

-(void)prepareVolumeButton{

     //CREATE BUTTON

     [self.view addSubView:self.muteButton];

     [self.muteButton addTarget:self action:@selector(volumeAction:) forControlEvents:UIControlEventTouchUpInside];

     self.muteButton.selected=[[[NSUserDefaults standardUserDefaults] objectForKey:@"volume"] boolValue];

}

-(IBAction)volumeAction:(id)sender{
    UIButton *btn=(UIButton *)sender;
    btn.selected=!btn.selected;
    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:btn.selected] forKey:@"volume"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

Now in the end, just change the Base Class(UIViewController).h to BaseViewController in all the UIViewControllers you want to add the volume button.

Hope it helps. (Ask if any doubt)

Cheers.

Upvotes: 1

Rickye
Rickye

Reputation: 1021

I'd recommend using a Singleton (details here) to store the state of it (have a @property BOOL enabled on it for example). But you have to place it manually on all screens and retrieve the state from the singleton on load.
One way to place it on all views is to create a UIViewController subclass (named MuteButtonViewController for example), override viewDidLoadand create the button in it. Then subclass MuteButtonViewController for the UIViewControllers where you need that mute button.

Upvotes: 1

Greg
Greg

Reputation: 25459

You can save it's state representation in NSUserDefaults when it changed and read it when you need.

The other solution can be a singleton class. The solution with singleton class is sometimes use in games. The class keep all settings. It's easy to change a setting and it's also easy to read it.

You can add notification or delegate to the singleton if the other classes needs to be notify when the button has changed.

Upvotes: 1

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