UIView

@interface ViewController ()

@end

@implementation ViewController

{

    UIView *_backView;

}

- (void)viewDidLoad {

   

    _backView = [[UIViewalloc] init];

    _backView.frame =CGRectMake(10,10, 120,120);

    _backView.backgroundColor = [UIColorblackColor];

    _backView.autoresizesSubviews  =YES;

    [self.viewaddSubview:_backView];

    

    UIView *topView = [[UIViewalloc] init];

    topView.frame  =CGRectMake(10,10, 100,100);

    topView.backgroundColor = [UIColororangeColor];

    topView.autoresizingMask = UIViewAutoresizingFlexibleHeight |UIViewAutoresizingFlexibleWidth;

    [_backViewaddSubview:topView];

    [NSTimerscheduledTimerWithTimeInterval:0.5target:selfselector:@selector(timeTick)userInfo:nilrepeats:YES];

    

    [superviewDidLoad];

}

- (void)timeTick{

    

    _backView.frame =CGRectMake(_backView.frame.origin.x,_backView.frame.origin.y,_backView.frame.size.width+5,_backView.frame.size.height+5);

}

- (void)didReceiveMemoryWarning {

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end