Implementation in Car class objective-C

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I have this code and I would like to know if this way of implementing is valid in objective-C. 

@interface Carro : NSObject

@property (copy, nonatomic) NSUInteger ano;
@property (copy, nonatomic) NSString *modelo;
@property (assign, nonatomic) NSUInteger ano;
@property (assign, nonatomic) NSUInteger qtdGasolina;
@property (assign, nonatomic) NSUInteger marchaAtual;

@end
ios objective-c

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You have set the year property twice. The correct form is using the modifier assign. Is used copy on objects that have a mutable counterpart, such as Nsstring - Nsmutablestring and Nsarray - Nsmutablearray.

For example, given the following code:

NSMutableString *modelo = [[NSMutableString alloc] initWithString:@"Fusca"];
Carro *carro = [Carro new];
carro.modelo = modelo;
[modelo setString:@"Kombi"];

If the attribute model were defined as assign, When modifying the String to Kombi, the value of the attribute of the Car object would also change, which is not generally expected.

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