How to save SKProduct object locally?

问题

I have tried to save a SKProduct object with archiving it with the class NSKeyedArchiver but it generates an error as -[SKProduct encodeWithCoder:]: unrecognized selector sent to instance.

+ (void)saveProduct:(SKProduct *)product
{
     NSData *data = [NSKeyedArchiver archivedDataWithRootObject:product];
    [[NSUserDefaults standardUserDefaults] setValue:data forKey:PRODUCT];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

Is there a way to save an instance of SKProduct or not?

回答1:

Your SKProduct class needs to conform to the NSCoding protocol.

In other words you need to fill out these two methods in your SKProduct class.

• (void)encodeWithCoder:(NSCoder *)aCoder;
• (id)initWithCoder:(NSCoder *)aDecoder;

This will take your SKProduct class and break it down so that it can be serialized and unserialized.

来源：https://stackoverflow.com/questions/14178790/how-to-save-skproduct-object-locally