CODEWITHSUNDEEP
iosobjective-cnsuserdefaults
SPUDERMAN
SPUDERMAN

Reputation: 187

How to save the state of a button after restarting the app?

So I have a button which changes its image upon clicking. I would like to save the state of the button so that, when user reopens the app again, the button will display it's last state.

Below is my code:-

- (IBAction)xButtonOnPressed:(id)sender {
    [self.xButtonLabel setImage:[UIImage imageNamed:@"x_did-not-take_marked.png"] forState:UIControlStateSelected];
    [self.xButtonLabel setImage:[UIImage imageNamed:@"x_did-not-take.png"] forState:UIControlStateNormal];

    self.xButtonLabel.selected = !self.xButtonLabel.selected;

}

The problem with the code is that, it always goes back to UIControlStateNormal after restarting the app. How can I save the last button state ?

Upvotes: 0

Views: 306

Answers (2)

elk_cloner
elk_cloner

Reputation: 2149

use NSUserDefaults for this.

Objective C:

To store:

[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"BUTTON_STATE_NORMAL"];

To retrieve:

Bool isNormalState = [[NSUserDefaults standardUserDefaults]
    boolForKey:@"BUTTON_STATE_NORMAL"];

if(isNormalState == true) {
  //Do your thing.
}

Additional:

swift 3:

To store:

UserDefaults.standard.set("Your_button_state", forKey: "Key") //setObject

To retrieve:

UserDefaults.standard.string(forKey: "Key")

There are lots of data type in this.Choose how you want to save>:)

Upvotes: 0

danh
danh

Reputation: 62686

Say you have a button called button:

UIButton *button;

// get nsuserdefaults
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// save selected state
[defaults setBool:button.selected forKey:@"myButtonState"];

Then later, after the app launches again...

// restore the selected state
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
button.selected = [defaults boolForKey:@"myButtonState"];

Upvotes: 2

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