01_可变数组用copy修饰之后还是可变的的吗

@interface ViewController ()
@property (nonatomic,copy)NSMutableArray *array;//可变数组用copy修饰

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.array = [[NSMutableArray alloc]init];
    for (int i = 0; i<5; i++) {
        UIImage *img  = [[UIImage alloc]init];
        [self.array addObject:img];//报错[__NSArray0 addObject:]: unrecognized selector sent to instance 0x7fff8062d570