Objective-C draw simple Analog Clock

Analog Clock

-(void)clockHoursWithCenter:(CGPoint )aCenter view:(UIView *)view radius:(NSInteger)radius
{

    NSArray *hoursArray = [[NSArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12", nil];
    
    UIView *aView = [[UIView alloc]init];
    aView.frame = CGRectMake(aCenter.x - aView.frame.size.width/2, aCenter.y - aView.frame.size.height/2, 10, 10);
    
    [UIView animateWithDuration:.3 animations:^{
        for (NSString *hour in hoursArray)
        {
            
            
            UIButton *hourButton = [[UIButton alloc]init];
            int hourNumber = [hour intValue];
            CGPoint center = aCenter;
            
            center.x = aView.bounds.size.width/2 + radius*sin(2*M_PI/12*hourNumber);
            center.y = aView.bounds.size.height/2 - radius*cos(2*M_PI/12*hourNumber);
            
            [hourButton setTitle:hour forState:UIControlStateNormal];
            [hourButton setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
            hourButton.frame = CGRectMake(center.x - hourButton.frame.size.width/2,center.y - hourButton.frame.size.height/2 , 25, 25);
            
            [aView addSubview:hourButton];
            [view addSubview:aView];
        }
        
    }];