Strange UIImageView in UIScrollView

Question

Very strange behavior, there is a round dot in the center of the screen using this code, and a UIScrollview with nothing inside in a nib. I expect that UIScrollview should be empty. The dot blurs and disappears when I scroll the screen.

- (void)viewDidLoad {
    [super viewDidLoad];
    NSArray *subviews = [closetScroll subviews];
    UIImageView *strange=[subviews objectAtIndex:0];
    strange.center = CGPointMake([[UIScreen mainScreen] bounds].size.width/2, [[UIScreen mainScreen] bounds].size.height/2);
    strange.alpha=1;

    NSLog(@"%@",subviews);
}

The console output is:

<UIImageView: 0x4b1f780; frame = (380.5 508.5; 7 7); opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x4b1f820>

Does anyone know why?

Answer 1

After magnifying the UIImageView and tweaking with configurations, I have come to conclude that the UIImageView is actually the scroll bar, and if horizontal and vertical scroll is enabled, an "empty" UIScrollview has two subviews inside.