Increment Integer in Nsuserdefaults

Increment integer in NSUserDefaults

No but if you do this a lot it might make a nice extension, something like this.

extension NSUserDefaults {
    class func incrementIntegerForKey(key:String) {
        let defaults = standardUserDefaults()
        let int = defaults.integerForKey(key)
        defaults.setInteger(int+1, forKey:key)
    }
}

Usage like this

NSUserDefaults.incrementIntegerForKey("counter")

Swift, iOS- NSUserDefaults for days active? Only increment int when it is the first time they opened app on THAT DAY?

First of all this NSDate extension will make things easier

extension NSDate {
    var isToday: Bool {
        let now = NSCalendar.currentCalendar().components([.Day, .Month, .Year], fromDate: NSDate())
        let this = NSCalendar.currentCalendar().components([.Day, .Month, .Year], fromDate: self)
        return now.year == this.year && now.month == this.month && now.day == this.day
    }
}

Now your extension can be written as follow

extension NSUserDefaults {
    class func incrementIntegerForKey(key:String) {
        let lastIncreased = NSUserDefaults.standardUserDefaults().valueForKey("lastCheck_\(key)")
        let alreadyIncreasedToday = lastIncreased?.isToday ?? false

        if !alreadyIncreasedToday {
            let counter = NSUserDefaults.standardUserDefaults().integerForKey(key)
            NSUserDefaults.standardUserDefaults().setInteger(counter + 1, forKey: key)
            NSUserDefaults.standardUserDefaults().setValue(NSDate(), forKey: "lastCheck_\(key)")
        }
    }
}

Please note that this incrementIntegerForKey is NOT thread safe.

How do I increment and save a int value in Swift?

You are declaring a new var deathScore everytime, initialized with 0 and incrementing it. It will always be 1.

UserDefaults.standard.set(UserDefaults.standard.integer(forKey: "saveNumberOfDeaths")+1, forKey: "saveNumberOfDeaths")

deathLabel.text = String(UserDefaults.standard.integer(forKey: "saveNumberOfDeaths"))

Saving incremental int variable

Try adding:

[[NSUserDefaults standardUserDefaults] synchronize];

After each time you change the value of your integer.

Quoting Apple's documentation on synchronize:

Writes any modifications to the persistent domains to disk and updates
all unmodified persistent domains to what is on disk.

http://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/Reference/Reference.html#//apple_ref/occ/instm/NSUserDefaults/synchronize

So with this modification, your final code should look like this:

[[NSUserDefaults standardUserDefaults] setInteger:i++ forKey:@"AppCount"];
[[NSUserDefaults standardUserDefaults] synchronize];

EDIT: Actually on second thought, give this a try:

I think the problem is using i++ assumes that the application will always be able to keep track of the count, and every time you re-enter the application i gets reset.

The following works, I just tested it.

if (![[NSUserDefaults standardUserDefaults] integerForKey:@"AppCount"]) {
    [[NSUserDefaults standardUserDefaults] setInteger:i forKey:@"AppCount"];
}else{
    [[NSUserDefaults standardUserDefaults] setInteger:[[NSUserDefaults standardUserDefaults] integerForKey:@"AppCount"] + 1 forKey:@"AppCount"];
}
    [[NSUserDefaults standardUserDefaults] synchronize]; 

How do I Increment Integer and save it for use when program is re-run?

You can use NSUserDefaults to store ints and other basic types (BOOL, float, NSString, NSArray).

For example, you can retrieve the int using

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
int orderNumber = [prefs integerForKey:@"orderNumber"];

and then save the int using

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setInteger:orderNumber  forKey:@"orderNumber"];

When necessary, you can also call

   [prefs synchronize];

to ensure that you are accessing the most up to date information. This is especially useful if you are accessing this int in multiple places in your app.

How to save integer value to NSuserDefault like sqlite?

Try to implement like this..Sure it'll help...

@implementation ClassA

- (void)viewDidLoad
    {
        [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.
        [[NSUserDefaults standardUserDefaults]setInteger:100 forKey:@"save_Interger_Value_For_Formula_One"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }

@end

@implementation ClassB

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
       int B = [[[NSUserDefaults standardUserDefaults]        integerForKey:@"save_Interger_Value_For_Formula_One"] integerValue];

     NSLog(@"Interger Value %d",b);
}

Increment UILabel from UserDefaults value - Swift

You never set pointScore1 to the value retrieved from UserDefaults.

Start by retrieving and storing the Int value, not a String.

override func viewDidLoad() {
    super.viewDidLoad()

    pointScore1 = UserDefaults.standard.integer(forKey: "points1")
    teamOnePoint.text = "\(pointScore1)"
}

@IBAction func teamOneButtonPressed(_ sender: Any) {
    pointScore1 += 1
    teamOnePoint.text = "\(pointScore1)"
    UserDefaults.standard.set(pointScore1, forKey: "points1")
}

Note that after a fresh install of the app, the initial value will be 0. Deal with that as desired.

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