Passing NSInteger variable to NSMutableDictionary or NSMutableArray

Question

Why does this not work:

NSInteger temp = 20;
[userSettingsFromFile setObject:temp forKey:@\"aTemp\"];

but this does:

[userS         


        

Answer 1

In order to store numbers in collections, you have to wrap them up in an NSNumber instance.

double aDouble = 20.3d;
NSInteger anInt = 20;

NSNumber *aWrappedDouble = [NSNumber numberWithDouble:aDouble];
NSNumber *aWrappedInt = [NSNumber numberWithInteger:anInt];

NSArray *anArray = [NSArray arrayWithObjects:aWrappedDouble, aWrappedInt, nil];