Question

I’ve had a problem like this before with adding scores but never solved it so I figured I ask it now and have both problems fixed at the same time. I made an shop where people can buy coins that will be added to their coins they already have. The coins they already have can be loaded by:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
NSString *loadcoins = [defaults objectForKey:@"savedcoins"];
[coinsdisplay setText:loadstring];

and I have a button where you can buy 100 coins

-(IBAction)savecoins100:(id)sender { 
    NSString *savecoins = @"100"; 
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    [defaults setObject:savecoins forKey:@"savedcoins"]; 
    [defaults synchronize];
}

What I want is that the new string becomes not @”100″ but 100 + previous coins now this would be loadcoins but I don’t know how to code this correctly can someone help me out?

thanks

Answer 1

Well for starters you should shouldn’t be using strings… Why aren’t you using an integer since you’re counting?

- (void)addCoins:(int)coinsToAdd
{
    int currentCoins = [[NSUserDefaults standardUserDefaults] integerForKey:@"savedcoins"];

    int newCoins = currentCoins + coinsToAdd;

    [[NSUserDefaults standardUserDefaults] setInteger:newCoins forKey:@"savedCoins"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

- (int)getCoins
{
    return [[NSUserDefaults standardUserDefaults] integerForKey:@"savedcoins"];
}

Then where ever you need to display it you can just create a string on the fly.

[coinsDisplay setText:[NSString stringWithFormat:@"Coins: %i",[self getCoins]]];