CODEWITHSUNDEEP
iosobjective-cdelegatesnsuserdefaultshidden
Thomas Stone
Thomas Stone

Reputation: 287

How to save a button's hidden state as a NSUserDefault?

Bellow I have some code that simply hides a button through a delegation system in Xcode. I believe that this all works however when I transfer views back to the 'leveSelector' view the delegate is not valid so the button does not show as un-hidden. Because of this I would like to apply some NSUserDefaults to save the button state so that when I go back to the'levelComplete' view later in the game I would like the button to be un-hidden.

Here I have the code for the delegate system i am using:

Here I have the levelComplete code... .h

#import <UIKit/UIKit.h>
#import "levelComplete.h"
#import "LevelSelector.h"

@interface levelComplete : UIViewController{
  }
 @property (nonatomic, strong) id<CustomDelegate> delegatePpty;

 @end

.m

@implementation levelComplete
@synthesize delegatePpty;

-(void)someAction
 {
[self.delegatePpty hideUnhidebutton:YES];//Call the delegate method to execute
 }


 - (void)viewDidLoad
   {
     [super viewDidLoad];
     // Do any additional setup after loading the view from its nib.
     [self someAction]; // Here I call my action
   }
@end

Here I have the leveSelector code...

.h

  @protocol CustomDelegate <NSObject>
  -(void)hideUnhidebutton:(BOOL)value;
  @end

#import <UIKit/UIKit.h>
#import "levelComplete.h"
#import "LevelSelector.h"

@interface LevelSelector : UIViewController <CustomDelegate>{        

}

@property (nonatomic, strong) UIButton *level1;

@end

.m

@implementation LevelSelector
@synthesize level1;

-(void)hideUnhidebutton:(BOOL)value
 {
  [self.level1 setHidden:value];

  }

So to clarify I would like to save the button when it has been hidden as a NSUserDefault. In this case the button I desire to hide is called level1.

Edit: thanks to everybody who posted apply your code worked great

Upvotes: 0

Views: 719

Answers (3)

boweidmann
boweidmann

Reputation: 3342

To save a boolean value to user defaults you have to call setBool method:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:YES forKey:@"ButtonHiddenKey"];

To load a boolean value from user defaults (in init method):

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
button.hidden = [defaults boolForKey:@"ButtonHiddenKey"];

There are also messages to store other types of variables such as setInteger, setFloat and so on

Upvotes: 1

Arndt Bieberstein
Arndt Bieberstein

Reputation: 1128

Sapi's answer already covers your comment How would I go about loading the NSUserDefaults

BOOL yourBoolValue = YES;

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[NSNumber numberWithBool:yourBoolValue] forKey:@"YourVariableKey"];

The last line has already the result you want. The [NSUserDefaults standardUserDefaults] is a singleton and also persistent, so you can create it in every context, having the same instance.

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
BOOL restoredBoolValue = [[defaults objectForKey:@"YourVariableKey"] boolValue];
[self.level1 setHidden:restoredBoolValue];

Ant that's it. You can basically save everything in the NSUserDefaults. Just check out Apple's reference.

Upvotes: 1

sapi
sapi

Reputation: 10224

You can save a value to NSUserDefaults in a straightforward manner:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[NSNumber numberWithBool:value]
             forKey:@"SomeSensibleKey"];

You can check the saved state with:

[[defaults objectForKey:@"SomeSensibleKey"] boolValue]

Upvotes: 4

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