Question

How should I implement two consumables with MKStoreKit? If I have two consumables, for example “handful of coins” (10 coins) and “bag with coins” (100 coins). I have two questions:

1. How should product IDs look like?

2. How to get overall amount of purchased coins, including ones from handful(s) and from bag(s)?

   Amount = 10*handfuls_purchased + 100*bags_purchased;
   

I’ve read tutorial on official MKStoreKit blog but I still just can’t figure this out.

P.s. I’m using MKStoreKit 3.1 and can’t update to more recent version because of ARC (my project doesn’t support it)

Answer 1

Your plist’s consumables key should look like this.

<key>Consumables</key>
    <dict>
        <key>com.yourcompany.yourapp.handfulofcoins</key>
        <dict>
            <key>Count</key>
            <integer>10</integer>
            <key>Name</key>
            <string>CoinsInMyApp</string>
        </dict>
<key>com.yourcompany.yourapp.bagofcoins</key>
        <dict>
            <key>Count</key>
            <integer>100</integer>
            <key>Name</key>
            <string>CoinsInMyApp</string>
        </dict>
    </dict>

I match the String “CoinsInMyApp” to calculate the number of purchased coins no matter which consumable they come from. In the above example if the user buys 1 bagofcoins and 2 handfulofcoins, MKStoreManager stores 120 for the key CoinsInMyApp.

methods,

- (BOOL) canConsumeProduct:(NSString*) productIdentifier
- (BOOL) canConsumeProduct:(NSString*) productIdentifier quantity:(int) quantity

will tell you if you have enough products.

When the player uses coins, you should let MKStoreKit know this by calling

- (BOOL) consumeProduct:(NSString*) productIdentifier quantity:(int) quantity

You can get the number of coins by calling

[[MKStoreManager numberForKey:@"CoinsInMyApp"] intValue];

PS: You can use MKStoreKit latest version in a non-ARC project by compiling it with the -fobjc-arc flag.

I wrote about this here http://blog.mugunthkumar.com/articles/migrating-your-code-to-objective-c-arc/