Question

How can I get an object based from a string in Objective C?

For example

int carNumber=5;
[@"car%i",carNumber].speed=10;
//should be same as typing car5.speed=10;

Oh course, those are just made up objects, but how could I get an object based on what is in a variable.

Answer 1

You cannot. When your code is compiled, the names of variables will no longer be what you’ve specified. car5 is not and has never been a string.

The better strategy would be to have an array of car objects and then specify the index. In C style (where carType is the type of each car):

carType carArray[5];

//! (Initialize your cars)

int carNumber= 5;
carArray[carNumber].speed= 10;

In Objective-C, if your cars are objects:

NSMutableArray* carArray= [[NSMutableArray alloc] init];

//! (Initialize your cars and add them to the array)

int carNumber= 5;
carType car= [carArray objectAtIndex:carNumber];
car.speed= 10;